Frequently Asked Questions

SUNOPEN has over 12 years of experience designing and manufacturing professional MPPT solar charge controllers, with products deployed in solar street lighting, telecom, and industrial projects globally.

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SUNOPEN serves solar lighting, traffic safety, security surveillance, IoT and telecom, marine and RV, and industrial off-grid sectors. Our controllers power critical infrastructure in remote areas worldwide.

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SUNOPEN offers MPPT controllers for various voltage systems: 12V for small solar setups, 24V for medium applications, 48V for RVs and off-grid systems, 60V for e-vehicles, and 72V for high-power applications. Our Boost MPPT series supports 48V/60V/72V battery systems.

Related page: About SUNOPEN

SUNOPEN is a professional MPPT solar charge controller manufacturer with 15+ years of R&D experience. We offer industry-leading 99.9% MPPT tracking efficiency, comprehensive OEM/ODM services, and global B2B supply with technical support in English, Chinese, and Spanish.

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Add Bluetooth (BL01) for local configuration, 4G (NET01) or WiFi (NET02) for remote monitoring of distributed systems like street light networks or security camera arrays, and Ethernet (NET03) for fixed industrial installations.

Related page: MPPT Selection Guide

Choose Buck MPPT (M Series) when panel voltage is higher than battery voltage (typical for 12V/24V street lights, security, telecom). Choose Boost MPPT (H Series) when panel voltage is lower than battery voltage (48V-72V e-vehicles, yachts).

Related page: MPPT Selection Guide

For 48V industrial monitoring, telecom stations, and larger off-grid systems, use the Variable Voltage Buck MPPT M48HC (30A) or the 800W Boost MPPT H20TB, depending on your panel array voltage configuration.

Related page: MPPT Selection Guide

The SUNOPEN blog covers MPPT technology guides, off-grid solar application tutorials for street lighting, security cameras, IoT, marine and RV, battery charging best practices, and product selection guides for industrial and commercial solar projects.

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Ideal for high-power electric vehicles, e-tricycles, electric motorcycles, RVs, and yachts. Provides solar auxiliary charging for high power demand applications.

Related page: 800W H20TB Boost MPPT

Supports 36V, 48V, 60V, 72V, and 90V multiple voltage specifications with automatic matching for different battery systems.

Related page: 800W H20TB Boost MPPT

Yes, the M-Series features adjustable charging current settings to optimize charging for different battery capacities and types.

Related page: M Series Variable Voltage Buck MPPT

Variable voltage MPPT can adapt to a wider range of solar panel configurations and battery voltages, providing more flexibility for system design.

Related page: M Series Variable Voltage Buck MPPT

Supports 12V, 24V, 36V, and 48V platforms, making it suitable for various applications from small residential to larger commercial systems.

Related page: M Series Variable Voltage Buck MPPT

Variable voltage (12V/24V/36V/48V) allows one controller model to serve diverse industrial applications: weather stations, water level monitoring, oil and gas sensors, pipeline monitoring, and agricultural irrigation systems with different voltage requirements.

Related page: M Series Variable Voltage Buck MPPT

All SUNOPEN MPPT controllers with RJ45 communication port are compatible with these modules for seamless integration.

Related page: Bluetooth / WiFi / 4G Modules

Yes, the output voltage is digitally adjustable from 5V to 30V, providing flexibility for various applications and device requirements.

Related page: DC/DC Digital Power Converter

The dual-channel 10A DC-DC converter provides stable, adjustable voltage output for powering sensors, communication equipment, and auxiliary devices in off-grid solar systems for industrial monitoring and IoT applications.

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The dual independent channels allow powering two different devices or providing redundant power supply from a single input source.

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The A-Series fixed voltage buck MPPT controllers are ideal for solar cameras, RVs, off-grid systems, and other applications requiring stable 12V or 24V output.

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A12PA and A12PB support 12V systems, with A12PA featuring basic functions and A12PB including enhanced communication options like Bluetooth connectivity.

Related page: M Series Fixed Voltage Buck MPPT

Ideal for solar cameras, RVs, off-grid systems, and monitoring systems requiring dual power supply. Supports automatic switching between solar and DC power.

Related page: A Series Smart Mini DC Hybrid MPPT

SUNOPEN MPPT controllers are designed for a wide range of applications: solar cameras and security systems, recreational vehicles (RVs) and motorhomes, yachts and marine vessels, electric vehicles including e-tricycles and e-bikes, IoT and remote monitoring systems, solar street lights, and industrial backup power systems. The controllers operate reliably from -40C to +85C.

Related page: MPPT Product Range

Boost MPPT (H10TA 450W, H20TB 800W) steps up voltage for 48V-72V systems like e-vehicles and yachts. Buck MPPT (M Series) steps down voltage for 12V-48V systems like street lights, security cameras, and telecom stations.

Related page: MPPT Product Range

SUNOPEN offers three main types of MPPT solar controllers: 1) Boost MPPT - designed for e-vehicles like e-tricycles and e-bikes, supporting 48V/60V/72V battery systems with 450W and 800W power options. 2) Buck MPPT - step-down controllers for RVs, yachts, and marine applications, available in fixed voltage and variable voltage models. 3) Hybrid MPPT - features automatic switching between solar PV and DC power sources.

Related page: MPPT Product Range

Consider three key factors: 1) Battery voltage - match your system (12V/24V/48V/60V/72V), 2) Maximum current - ensure controller rating exceeds solar panel current, 3) Application type - choose Boost MPPT for higher battery voltage than solar panel voltage, or Buck MPPT for the opposite. Use our solar calculator for detailed sizing.

Related page: System Solutions

Yes. Provide battery voltage and chemistry, PV specifications, load power and application conditions for model selection.

A project-specific review can be requested by providing the electrical diagram or system parameters together with the intended application.

Some variable-voltage models cover multiple platforms, but controller limits remain model-specific. Reusing a controller across projects requires an electrical compatibility check.

Use local solar resource data, realistic load energy, battery autonomy and appropriate PV/controller margin rather than relying on peak-sun conditions alone.

For the same PV power, higher battery voltage generally means lower charging current because current is approximately power divided by voltage, subject to conversion losses.

Compare the PV operating voltage with the battery voltage. Buck steps voltage down; boost steps voltage up. The actual controller input/output limits must also be checked.

Lithium and lead-acid batteries have different charging requirements. The controller must use the correct voltage limits, charging stages and protection settings for the selected chemistry.

Use buck when the PV operating voltage is higher than the battery voltage. Use boost when the available PV voltage is lower than the battery voltage and the controller is designed to step it up.

The range covers multiple low- and high-voltage platforms, including 12V, 24V, 36V, 48V, 60V and 72V models depending on the product.

SUNOPEN focuses on MPPT solar charge controllers, boost and buck topologies, hybrid controllers, DC/DC power products and communication modules.

Temperature, humidity, water exposure, dust, corrosion, vibration and installation ventilation can all affect reliability. Outdoor and marine systems need additional environmental protection.

Provide battery voltage and chemistry, PV module Voc/Vmp/Imp/Pmax, load power, operating temperature, installation environment and desired communications. These details allow a more reliable product match.

Battery voltage/chemistry, PV Voc/Vmp/Imp/Pmax, load wattage, operating temperature, application, expected quantity and communication requirements.

450W Boost MPPT for 48V/60V/72V electric vehicles and e-tricycles, with 99.9% MPPT tracking efficiency.

800W Boost MPPT for high-power 48V/60V/72V systems, including e-vehicles, RVs and yachts.

12V/24V hybrid MPPT with dual PV and auxiliary DC input and automatic source switching.

Fixed-voltage buck MPPT for 12V/24V/48V systems, including solar lighting, cameras and RV/off-grid systems.

Variable-voltage buck MPPT for 12V/24V/36V/48V platforms, with adjustable charging current.

Dual-channel adjustable DC/DC converter with 10V-32V input, 5V-30V output and up to 10A output current.

MPPT solar charge controllers, boost and buck controllers, DC-DC converters and communication modules.

Start with the SUNOPEN product selection guide or solar calculator, then provide the project electrical parameters for technical confirmation.

The A Series integrates an ATS (Automatic Transfer Switch): when solar input and battery voltage fall below the threshold, it switches critical loads to a backup source (mains or generator) within milliseconds, and switches back automatically once solar or battery power recovers. This makes the A Series ideal for telecom base stations, security monitoring and other loads that must never stop.

Related page: MPPT Solar Charge Controllers | Boost & Buck

For a standard 60V 50Ah e-trike with a single 400W panel and a boost MPPT controller like the SUNOPEN H10TA series, average daily solar yield in sunny regions is around 1.5-2.0 kWh, adding roughly 20-30 km of extra daily range without grid charging.

Related page: Solar Charging for E-Trikes

A typical 4G security camera consumes 5-15W. Use a 50-100W solar panel, 12V 20-40Ah battery, and a SUNOPEN Fixed Voltage Buck MPPT controller for reliable 24/7 off-grid surveillance at construction sites or remote perimeters.

Related page: Solar Security Cameras

Calculate daily energy consumption (LED wattage x hours), multiply by desired backup days (typically 2-3), divide by system voltage and depth of discharge (50% for lead-acid, 80% for lithium). Use our solar calculator for precise sizing.

Related page: Solar Street Lighting

Solar street light capacity calculation needs to consider: average daily power consumption (W) × sunshine hours (hours) ÷ solar panel efficiency × system loss coefficient. At the same time, battery capacity must support at least 3-5 days of backup power during cloudy weather.

Related page: Solar Street Lighting

A typical 40-50ft yacht with fridge, navigation, lights, and watermaker needs 400-800W of solar panels. Pair with the SUNOPEN 800W Boost MPPT (H20TB) for 48V systems to efficiently charge your house battery bank.

Related page: Solar Power for Yachts

Select MPPT controller power based on total solar panel power. It is recommended to choose MPPT power greater than solar panel power for margin. Use the SUNOPEN Solar Calculator for quick sizing.

Related page: 800W H20TB Boost MPPT

Yes. The dual PV+DC input with automatic switching makes it perfect for solar street lights, parking lot lighting, and pathway lights that may need DC power backup during extended cloudy periods.

Related page: A Series Smart Mini DC Hybrid MPPT

Yes. Input your camera power consumption, desired backup days, and location solar irradiance. The calculator will recommend the appropriate panel size, battery capacity, and MPPT controller for off-grid surveillance systems.

Related page: Solar Calculator

Enter your panel wattage, system voltage (12V/24V), and battery type into the calculator. For street lighting, we typically recommend the Fixed Voltage Buck MPPT series with 99.9% efficiency for reliable overnight operation.

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To calculate MPPT controller size: (Total Solar Panel Watts ÷ Battery Voltage) × 1.25 (safety factor). Example: 600W panel ÷ 48V battery = 12.5A × 1.25 = 15.6A. Recommended: 20A or higher MPPT controller.

Related page: Solar Calculator

A 20A MPPT controller can handle approximately: 960W at 48V (20A × 48V). Actual capacity depends on battery voltage and controller efficiency rating.

Related page: Solar Calculator

MPPT Controller Amps = (Solar Panel Wattage ÷ Battery Bank Voltage) × 1.25. The 1.25 multiplier is a safety factor to account for optimal solar conditions and controller efficiency losses.

Related page: Solar Calculator

For weather stations, water monitoring, or pipeline monitoring, provide sensor power draw, data transmission frequency, battery voltage, and minimum sunlight days. The calculator sizes panels, batteries, and our Variable Voltage Buck MPPT accordingly.

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The 1.25 safety factor (or 25% margin) accounts for: 1) Solar panels rarely produce rated power continuously, 2) Temperature effects reduce panel output, 3) Controller conversion efficiency losses (~95-98%), 4) Future system expansion.

Related page: Solar Calculator

Yes as a preliminary sizing tool, but marine and mobile systems require additional consideration of shading, vibration, corrosion, space and battery charging requirements.

Sizing math alone does not determine topology. Compare PV operating voltage with battery voltage and select a controller designed for that relationship.

The tool helps with solar/controller sizing. Battery capacity should additionally be sized from daily energy demand, desired autonomy, usable depth of discharge and battery chemistry.

No. A calculator is a preliminary design aid. Final selection must verify electrical limits, charging profile, temperature, wiring, protection and installation conditions.

Divide 600W by the battery voltage to estimate charging current, then apply the appropriate design margin and verify the controller power/current limits.

Estimate daily load energy, account for local solar availability and system losses, then choose panel wattage with appropriate energy margin for cloudy periods and seasonal variation.

Backup depends on load power, required autonomy, usable battery capacity, battery chemistry and environmental conditions. Critical infrastructure normally needs a larger design margin.

Use Vmp for expected operating conditions and verify Voc remains within the controller maximum input limit across the coldest expected temperature.

A sizing tool for MPPT controller current, battery voltage and solar panel wattage.

Choose a model that meets the required current and power with appropriate margin, then verify the manufacturer limits and thermal conditions.

Battery voltage and chemistry, PV specifications, load wattage, daily energy use, autonomy requirement, installation environment and communications requirements.

Send the calculated PV wattage/current, battery voltage and chemistry, panel Voc/Vmp, load requirements and application so the technical team can verify the model.

A common preliminary calculation is controller current ≈ solar-panel watts ÷ battery voltage, with an engineering margin. The calculator provides a convenient starting point, not a replacement for the controller datasheet.

At minimum, calculate battery voltage, PV wattage, PV voltage/current, daily energy demand and required backup time. Then select the controller topology and current rating.

Real systems experience variation in irradiance, temperature, wiring losses and operating conditions. A margin helps prevent a controller from being selected too close to its limit.

Rule of thumb for copper cable: up to 10 A use 2.5 mm², up to 20 A use 4 mm², up to 30 A use 6 mm², and up to 50 A use 10 mm². For runs longer than 10 m, go one size up to limit voltage drop, and size the battery fuse at 1.25 × the maximum charging current.

Related page: Solar System Calculator | MPPT Sizing Tool

A boost controller raises the panel voltage up to the battery voltage, so the panel open-circuit voltage must stay below the battery's minimum voltage. The H10TA (450 W) charges 48V-72V batteries and the H20TB (800 W) accepts PV input from 36V-90V; configure series/parallel panels to stay inside those windows.

Related page: 450W Boost MPPT Controller (48V/60V/72V)

Yes. Our MPPT controllers deliver continuous power for CCTV and remote monitoring, absorb the surge current of PTZ motors, and keep charging stable from -35°C to +60°C ambient temperature.

Related page: Off-grid Applications

Yes. The 800W Boost MPPT (H20TB) charges 48V-72V battery banks on yachts and motorhomes, while the 450W Boost MPPT suits e-scooters and light EVs. Both are compact, fanless and sealed against salt spray.

Related page: Off-grid Applications

We supply cost-effective, durable MPPT controllers for residential off-grid systems in developing regions, with OEM / ODM options and volume pricing for government and NGO electrification programmes.

Related page: Off-grid Applications

SUNOPEN MPPT controllers cover six core off-grid scenarios: security and surveillance cameras, telecom base stations and IoT gateways, RV / caravan / marine systems, solar street lighting and traffic safety equipment, oil & gas and mining monitoring, and rural electrification for communities without grid access.

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Industrial-grade hardware with conformal-coated PCBs, a wide operating temperature range and fail-safe power delivery keeps sensors, flow meters and pipeline monitoring equipment running in hazardous, unattended locations.

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For remote base stations, microwave repeaters and IoT gateways, pick a Buck MPPT matched to your battery bank (12V / 24V / 48V) with a current rating above the panel short-circuit current. Add a Bluetooth, WiFi or 4G module for remote diagnostics and fewer site visits.

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By combining high-efficiency MPPT controllers with large-capacity lithium battery storage systems, solar IoT devices can charge during the day and use stored energy at night or during cloudy days, achieving uninterrupted power supply around the clock.

Related page: Solar IoT for Smart Cities

Use MPPT controllers with 99.9% efficiency, oversizing panels by 30% for worst-case winter sunlight, and specifying 3-5 days of battery backup. Add 4G/WiFi modules for remote monitoring of each smart city node.

Related page: Solar IoT for Smart Cities

Most IoT environmental sensors consume 1-5W, with cellular modems drawing peak 5-15W during transmission. A small 20-50W panel with 12V battery and SUNOPEN Smart Mini Hybrid MPPT provides reliable year-round power.

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Most suitable scenarios include: smart streetlights, environmental monitoring stations, smart parking sensors, flood warning systems, and remote area surveillance that require long-term deployment but are inconvenient for grid connections.

Related page: Solar IoT for Smart Cities

The A Series Smart Mini DC Hybrid MPPT is ideal for smart streetlight IoT nodes due to its compact size, dual power input, and support for Bluetooth/4G communication modules for remote dimming and monitoring.

Related page: Solar IoT for Smart Cities

A Boost MPPT controller accepts a low PV input voltage (e.g. 16V-60V from a single 300W-450W flexible panel) and steps it UP to charge 48V, 60V or 72V battery systems, while running an MPPT algorithm to extract maximum power from the panel.

Related page: Solar Charging for E-Trikes

A standard Buck MPPT controller needs the solar panel voltage (18V-32V) to be higher than the battery voltage. To charge a 60V-72V pack you would need 2-3 large panels wired in series, which rarely fits on a tricycle roof. A Boost MPPT controller steps a lower PV voltage up to charge 48V, 60V or 72V packs from a single panel.

Related page: Solar Charging for E-Trikes

Yes. SUNOPEN offers one-stop off-grid solar solutions including controller selection, battery sizing, panel recommendations, and communication integration for any application from solar billboards to remote agricultural irrigation.

Related page: Off-grid Solar Solutions

For critical systems like emergency call boxes, border security, or pipeline monitoring, use 99.9% efficient MPPT controllers, oversized panels (30-50%), 5+ days battery backup, and remote monitoring via 4G modules to detect issues before failures.

Related page: Off-grid Solar Solutions

The most common off-grid solar applications include solar street lighting, remote security cameras, traffic safety signs, IoT sensor networks, telecom base stations, yacht/RV power, and industrial monitoring for weather, water, and pipeline systems.

Related page: Off-grid Solar Solutions

A solar off-grid system is an independent power system that does not rely on the traditional power grid. It collects energy through solar panels and, with MPPT controllers and battery storage, powers various equipment. SUNOPEN's off-grid systems are widely used in lighting, monitoring, and communication applications.

Related page: Off-grid Solar Solutions

Yes. For PTZ cameras consuming 20-40W, use a 150-200W panel, larger 12V or 24V battery bank, and the Variable Voltage Buck MPPT (M24HA/M24HB) which supports higher charging currents for these higher-demand surveillance systems.

Related page: Solar Security Cameras

Yes. MPPT controllers with 99.9% efficiency harvest more energy in low-light winter conditions. Oversizing the panel by 20-30% and using lithium batteries with wider temperature ranges ensures reliable winter operation.

Related page: Solar Street Lighting

For solar street lighting, we recommend the SUNOPEN Fixed Voltage Buck MPPT series (M12PA/M12PB for 12V, M24PA/M24PB for 24V) with 99.9% tracking efficiency to maximize nighttime illumination time.

Related page: Solar Street Lighting

The SUNOPEN 800W Boost MPPT (H20TB) is ideal for yachts, catamarans, and sailboats with 48V/60V/72V battery banks. Its 99.9% efficiency maximizes energy from limited deck-mounted panel space.

Related page: Solar Power for Yachts

No. The H20TB is strictly designed for 48V, 60V and 72V platforms. It is NOT compatible with 36V or 96V setups.

Related page: H20TB Installation Guide

Yes. Our Buck MPPT series (M12PA, M12PB, M24PA, M24PB) is ideal for solar street lighting, parking lot lighting, pathway lighting, and billboard illumination, with 99.9% tracking efficiency for consistent nighttime operation.

Related page: SUNOPEN MPPT Solar Controllers

Absolutely. Our Variable Voltage Buck MPPT (M24HA/M24HB/M24HC/M48HC) supports 12V-48V platforms, making them suitable for weather stations, water quality monitoring, oil and gas flow measurement, pipeline monitoring, and agricultural irrigation control.

Related page: SUNOPEN MPPT Solar Controllers

Yes. SUNOPEN provides reliable off-grid power solutions for broadband hotspots, remote telecom base stations, emergency call boxes, IoT environmental sensors, and smart city infrastructure using our high-efficiency MPPT controllers.

Related page: SUNOPEN MPPT Solar Controllers

MPPT technology harvests up to 30% more energy from solar panels compared to PWM controllers, ensuring reliable power for critical off-grid systems like remote security cameras, weather stations, and telecom infrastructure where grid power is unavailable.

Related page: SUNOPEN MPPT Solar Controllers

SUNOPEN MPPT controllers power a wide range of off-grid applications including solar street lighting, traffic safety systems, security cameras, IoT sensors, telecom base stations, RVs, yachts, and industrial monitoring equipment in remote locations.

Related page: SUNOPEN MPPT Solar Controllers

For solar-powered security cameras, construction site monitoring, perimeter surveillance, and border security systems, we recommend our Fixed Voltage Buck MPPT or Variable Voltage Buck MPPT controllers paired with Bluetooth/WiFi/4G modules for remote monitoring.

Related page: SUNOPEN MPPT Solar Controllers

For yachts, catamarans, sailboats, and RVs, our 800W Boost MPPT (H20TB) supports 48V/60V/72V systems, while the 450W Boost MPPT (H10TA) suits e-bikes and e-tricycles. Both deliver 99.9% efficiency for marine battery charging.

Related page: SUNOPEN MPPT Solar Controllers

The 450W Boost MPPT works well for small boats, fishing vessels, and day-sailors with 48V battery banks, offering compact and efficient marine solar charging.

Related page: 450W H10TA Boost MPPT

Yes. The H10TA 450W Boost MPPT is specifically designed for e-bikes, e-tricycles, and small electric vehicles with 48V/60V/72V battery systems, providing efficient solar charging on the go.

Related page: 450W H10TA Boost MPPT

Suitable for 48V, 60V, 72V electric vehicles, e-tricycles, and electric motorcycles. Provides solar auxiliary charging to extend driving range.

Related page: 450W H10TA Boost MPPT

Yes. The 800W capacity supports larger solar arrays commonly installed on yacht cabins and catamaran decks, maximizing energy harvest for extended off-grid cruising.

Related page: 800W H20TB Boost MPPT

The H20TB 800W Boost MPPT is ideal for yachts, catamarans, powerboats, sailboats, and large RVs with 48V/60V/72V battery banks, delivering high-power solar charging for marine and recreational off-grid use.

Related page: 800W H20TB Boost MPPT

Yes. The 30A capacity and 48V support make these models suitable for remote telecom base stations, broadband hotspots, and emergency communication systems requiring reliable off-grid power.

Related page: M Series Variable Voltage Buck MPPT

Yes. The synchronous buck-boost design handles wide input voltage fluctuations common in marine and RV electrical systems, providing clean 5V-30V power for navigation equipment, communication radios, and onboard electronics.

Related page: DC/DC Digital Power Converter

Yes. The Fixed Voltage Buck MPPT reliably powers solar traffic signs, speed feedback displays, RRFB beacons, and school zone warning systems with consistent 12V or 24V output.

Related page: M Series Fixed Voltage Buck MPPT

The M12PA/M12PB (12V) suits small street lights and pathway lighting, while M24PA/M24PB (24V) is better for larger street lighting poles, parking lot lights, and billboard illumination with higher power panels.

Related page: M Series Fixed Voltage Buck MPPT

Absolutely. Its compact size, dual power input, and 99.9% efficiency make it ideal for IoT environmental sensors, smart city nodes, and remote monitoring devices where space and reliability are critical.

Related page: A Series Smart Mini DC Hybrid MPPT

For solar security cameras, construction site surveillance, and perimeter monitoring, the Variable Voltage Buck MPPT (M24HA/M24HB/M24HC/M48HC) supports 12V-48V and pairs with our 4G/WiFi modules for remote connectivity.

Related page: MPPT Product Range

The Fixed Voltage Buck MPPT series (M12PA/M12PB for 12V, M24PA/M24PB for 24V) is designed for solar street lighting, parking lot lights, and pathway lighting, with 99.9% efficiency and optional Bluetooth/Ethernet monitoring.

Related page: MPPT Product Range

Our Smart Mini DC Hybrid MPPT (A Series) with dual PV+DC input and communication modules (Bluetooth, 4G, WiFi, Ethernet) are ideal for IoT sensors, smart streetlights, environmental monitoring, and smart city deployments.

Related page: MPPT Product Range

Yes. Our MPPT controllers reliably power solar traffic monitoring systems, speed feedback signs, radar signs, rectangular rapid flashing beacons (RRFB), school zone safety systems, and traffic counters in locations without grid access.

Related page: System Solutions

Our solar security solutions use high-efficiency MPPT controllers with 99.9% tracking efficiency, paired with 4G/WiFi communication modules for remote monitoring. This ensures 24/7 operation for construction sites, perimeter surveillance, and border security systems.

Related page: System Solutions

SUNOPEN provides off-grid power for broadband and WiFi hotspots, remote telecom base stations, emergency call boxes, IoT sensor networks, and environmental monitoring stations, with optional remote monitoring via Bluetooth, 4G, WiFi, or Ethernet.

Related page: System Solutions

SUNOPEN MPPT controllers are ideal for: Recreational vehicles (RVs) and motorhomes, marine and yacht solar systems, e-vehicles including e-tricycles and e-bikes, solar-powered IoT and remote monitoring systems, solar street lights and security cameras, and off-grid residential power systems.

Related page: System Solutions

We support weather stations, water quality and level monitoring, oil and gas flow measurement, pipeline monitoring, and agricultural irrigation control systems. Our Variable Voltage Buck MPPT handles 12V-48V industrial sensors.

Related page: System Solutions

For yachts, catamarans, powerboats, sailboats, and RVs, our 800W Boost MPPT (H20TB) efficiently charges 48V-72V battery banks. We also offer marine-grade DC-DC converters and communication modules for complete vessel power management.

Related page: System Solutions

SUNOPEN provides complete off-grid solar solutions for six major sectors: solar lighting, traffic safety, security and surveillance, IoT and telecom, marine and RV, and industrial off-grid monitoring, all powered by our 99.9% efficient MPPT controllers.

Related page: System Solutions

Yes, with the correct voltage, power and environmental configuration. Marine installations should also address corrosion and moisture.

Yes for preliminary power/current calculations. For 48V/60V/72V e-trikes, also confirm that the selected controller uses the required boost topology and supports the battery voltage.

Yes. The site describes solar security-camera applications, including remote and 4G deployments, with monitoring options for compatible controllers.

The site provides application guidance for vehicles, RV/marine, lighting, security, telecom, IoT and off-grid systems, and project-specific consultation can be requested.

Yes. The 450W and 800W boost MPPT products target 48V/60V/72V electric-vehicle and e-tricycle applications.

Yes. The site describes use in telecom, IoT, security, lighting, environmental monitoring and other remote industrial/off-grid applications.

Yes. The application range includes telecom, IoT gateways, environmental monitoring and other remote loads that need dependable off-grid power.

Yes. SUNOPEN provides MPPT products and application guidance for RVs, yachts and other off-grid systems, subject to voltage, power and environmental requirements.

Yes. The boost MPPT range is designed for applications such as e-bikes, e-tricycles, electric motorcycles and other light electric vehicles.

Give sensor/communication load, duty cycle, daily energy use, battery voltage, autonomy requirement, PV data and network conditions.

Give battery-bank voltage, available panel area, total panel wattage, shading, marine environment and daily energy demand.

Give battery nominal voltage, battery chemistry, panel size and Voc/Vmp, available roof area, desired charging power and operating environment.

Off-grid solar lighting, security, telecom, IoT, RV, marine, industrial and remote monitoring applications.

SUNOPEN publishes dedicated application articles for security cameras, street lighting, off-grid systems, smart-city IoT, e-trikes and yachts.

MPPT (Maximum Power Point Tracking) is an advanced algorithm used in solar charge controllers that continuously adjusts the input resistance to maximize power output from solar panels. SUNOPEN's MPPT controllers achieve 99.9% tracking efficiency, significantly outperforming traditional PWM controllers.

Related page: About SUNOPEN

Yes. The SUNOPEN Smart Mini DC Hybrid MPPT (A Series) supports dual PV+DC input with automatic switching, perfect for off-grid sites that use a backup DC generator or wind turbine alongside solar panels.

Related page: Battery Charging Guide

Cold temperatures reduce battery capacity and charging efficiency. SUNOPEN MPPT controllers include temperature compensation sensors, ideal for outdoor enclosures in remote telecom and weather stations operating in extreme climates.

Related page: Battery Charging Guide

The key is to correctly set charging voltage parameters for each stage: Use high current for rapid charging during Bulk stage; Maintain constant voltage to fully charge during Absorption stage; Reduce voltage to maintain full charge during Float stage. Also ensure temperature compensation is enabled to automatically adjust charging voltage based on ambient temperature.

Related page: Battery Charging Guide

For LiFePO4 batteries in off-grid systems, use a 3-stage charging profile (bulk, absorption, float) with voltage setpoints configured for your specific battery. SUNOPEN controllers support customizable lithium charging profiles.

Related page: Battery Charging Guide

LiFePO4 batteries typically have a charging voltage of 3.65V/cell, supporting deep discharge but requiring more precise overcharge protection. NMC batteries have a charging voltage of 4.2V/cell with higher energy density but more sensitive to charging termination voltage. MPPT controllers need to select appropriate charging curves based on battery type.

Related page: Battery Charging Guide

Yes. Even for small systems like IoT sensors or pathway lights, higher MPPT efficiency means you can use smaller panels and batteries while maintaining the same reliability, reducing overall project cost.

Related page: MPPT Efficiency Guide

More efficient energy harvesting means batteries spend less time in deep discharge, especially during low-light periods. This extends battery life by 20-40% in off-grid applications like remote telecom stations and weather monitoring.

Related page: MPPT Efficiency Guide

Compared to traditional PWM controllers, high-efficiency MPPT controllers can improve energy harvest by 15-30%. The specific improvement depends on light conditions, panel configuration, and system design.

Related page: MPPT Efficiency Guide

A 99.9% efficient MPPT controller harvests 15-30% more energy than a PWM controller. Over a year, this means significantly more reliable power for off-grid street lights, security cameras, and remote sensors during cloudy winters.

Related page: MPPT Efficiency Guide

MPPT (Maximum Power Point Tracking) efficiency refers to how accurately the controller tracks the maximum power point of solar panels. SUNOPEN's MPPT controllers achieve 99.9% tracking efficiency, significantly outperforming traditional PWM controllers.

Related page: MPPT Efficiency Guide

SUNOPEN boost MPPT controllers are compatible with all chargeable battery types including FLD (flooded), GEL, LI (lithium), SLD (sealed lead-acid) and User-defined charging profiles, so you can tune the curve for LiFePO4 or NMC packs.

Related page: Solar Charging for E-Trikes

SUNOPEN's MPPT controllers achieve 99.9% tracking efficiency, leading the industry. This high conversion rate ensures maximum energy harvesting, significantly outperforming traditional PWM controllers at 70-80% efficiency.

Related page: Off-grid Solar Solutions

Pair the MPPT controller with a SUNOPEN NET01 4G or NET02 WiFi module to remotely monitor battery voltage, charging current, and system health, ensuring your security cameras never go offline due to power issues.

Related page: Solar Security Cameras

High-quality lithium batteries can last 5-8 years under normal use. Choosing the right MPPT controller and proper charge/discharge management can significantly extend battery life and reduce maintenance costs.

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Use marine-grade enclosures, install controllers in dry cabin locations, and use tinned copper wiring. SUNOPEN controllers are designed for reliable operation in marine environments for yacht and boat power systems.

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The 800W limit is the maximum safe PV array input, NOT the load-driving capability. On the battery side, current is constrained by battery voltage; for example, charging a 72V bank at 800W yields roughly 11A of charging current.

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Connect the battery FIRST so the controller initializes and auto-detects the system voltage, then connect the PV array LAST. Connecting PV first sends unconditioned full voltage into an uninitialized controller and can permanently damage the board.

Related page: H20TB Installation Guide

PWM controllers can only drop voltage (buck), not boost it. If the PV voltage is lower than the battery voltage, a PWM controller simply won't charge the battery at all. A boost MPPT is required to step 18V-36V panels up to 48V/60V/72V battery banks.

Related page: H20TB Installation Guide

MPPT controllers require minimal maintenance: Keep the heatsink clear of dust and debris, check connections quarterly for corrosion, monitor performance through the app (for models with Bluetooth/WiFi), and ensure adequate ventilation to prevent overheating. Annual inspection of wiring and terminals is recommended.

Related page: SUNOPEN Blog

MPPT (Maximum Power Point Tracking) controllers are significantly more efficient than PWM (Pulse Width Modulation) controllers. MPPT can achieve 99.9% efficiency by dynamically adjusting to find the optimal power point, while PWM controllers typically max out at 70-80% efficiency. MPPT controllers also perform better in cold weather and with high-voltage solar panels.

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Yes. Solar regulator, solar charge regulator and PV charge controller are alternative names for the same device: an MPPT solar charge controller, which tracks the maximum power point of the PV array to charge batteries efficiently. SUNOPEN is an MPPT solar charge controller manufacturer and supplier, offering boost, buck and hybrid models for off-grid solar systems from 12V to 72V.

Related page: SUNOPEN MPPT Solar Controllers

MPPT stands for Maximum Power Point Tracking. It is an advanced algorithm used in solar charge controllers that continuously adjusts the operating voltage and current to extract the maximum available power from solar panels. SUNOPEN's MPPT controllers achieve 99.9% tracking efficiency, meaning nearly all available solar energy can be effectively harvested.

Related page: SUNOPEN MPPT Solar Controllers

99.9% MPPT efficiency means the controller maximizes energy extraction from solar panels. For a 100W solar panel system, this translates to approximately 15-20% more energy annually compared to traditional controllers. Higher efficiency means faster battery charging, longer runtime, and better return on investment for solar installations.

Related page: SUNOPEN MPPT Solar Controllers

Multiple protection functions: over-voltage protection, over-current protection, short-circuit protection, reverse polarity protection, and over-temperature protection.

Related page: 450W H10TA Boost MPPT

Yes. With Bluetooth (BL01), WiFi (NET02), or 4G (NET01) connectivity, you can remotely monitor and manage large solar street lighting networks, tracking performance, fault detection, and energy usage across hundreds of poles.

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Monitor through WeChat Mini Program, dedicated APK mobile app, or web browser interface for real-time system performance and status updates.

Related page: Bluetooth / WiFi / 4G Modules

The NET01 4G and NET02 WiFi modules enable remote monitoring of solar-powered security cameras, construction site surveillance, and perimeter systems, allowing real-time status checks and alerts from anywhere.

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BL01 for Bluetooth, NET01 for 4G cellular, NET02 for WiFi, and NET03 for wired RJ45 Ethernet connection to suit different installation environments.

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Includes over-voltage (OV), over-current (OC), short-circuit (SC), and over-temperature protection (OTP) for safe operation.

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Yes, the controller supports both lead-acid and lithium batteries with configurable charging parameters for optimal battery performance.

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Supports lead-acid and lithium batteries with selectable charging curves through parameter settings.

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PV is solar photovoltaic input, AUX is auxiliary DC power input. When solar power is insufficient, the system automatically switches to DC power supply for continuous operation.

Related page: A Series Smart Mini DC Hybrid MPPT

All SUNOPEN MPPT controllers support both lead-acid (flooded, gel, AGM) and lithium-ion (LiFePO4) batteries with user-configurable charging profiles, suitable for all off-grid energy storage requirements.

Related page: MPPT Product Range

SUNOPEN offers three communication modules for remote MPPT monitoring: Bluetooth module for short-range wireless connection to smartphones, WiFi module for local network integration and cloud connectivity, and 4G module for cellular IoT applications in remote locations without WiFi coverage. All modules use standard RJ45 interface.

Related page: MPPT Product Range

All SUNOPEN MPPT solar charge controllers feature industry-leading 99.9% MPPT tracking efficiency. This maximum power point tracking technology maximizes energy harvest from solar panels in all weather conditions, ensuring optimal performance for off-grid solar systems.

Related page: MPPT Product Range

If the controller has a compatible communication interface, SUNOPEN communication modules can provide monitoring options such as Bluetooth, Wi-Fi, 4G or Ethernet, depending on the model.

Battery compatibility depends on the supported charging profile and project configuration. Confirm the required lithium chemistry and charging parameters before deployment.

Yes. Specify whether you need Bluetooth, Wi-Fi, 4G, Ethernet, RS485/Modbus or another interface so compatibility can be checked.

Compatible SUNOPEN controllers can use Bluetooth, Wi-Fi, 4G or Ethernet communication modules for system data and status monitoring.

Yes. Monitoring battery voltage, charging current, PV status and alarms can help identify low-energy conditions and faults before they cause an outage.

Yes. Compatible controllers can use Bluetooth, Wi-Fi, 4G or Ethernet communication modules for local or remote monitoring.

MPPT continuously adjusts the operating point of the PV array to seek its maximum-power region. Actual energy gain depends on weather, panel configuration, temperature and system losses.

The product range includes boost MPPT for higher-voltage battery applications and buck MPPT for systems where PV voltage is higher than battery voltage, plus hybrid designs for dual power inputs.

Where stated for this product, 99.9% refers to MPPT tracking efficiency: how closely the controller tracks the panel maximum-power point. It is not a promise that the complete system converts 99.9% of input energy.

BL01 Bluetooth, NET01 4G, NET02 Wi-Fi and NET03 Ethernet modules for monitoring compatible SUNOPEN controllers.

SUNOPEN emphasizes high MPPT tracking efficiency, multiple protection functions, compact designs and application-specific controller topologies.

Common mistakes include selecting the wrong topology, exceeding voltage/current limits, undersizing wiring, ignoring heat dissipation and configuring battery charging parameters incorrectly.

The choice depends on the PV voltage and battery voltage. Buck is appropriate when PV voltage is higher; boost is relevant when the available PV voltage must be increased.

Possible reasons include: insufficient solar panel power (cloudy or shading), improper charging parameter settings (absorption time too short), increased battery internal resistance due to aging. Check solar panel cleanliness, reset charging parameters, and consider battery health status.

Related page: Battery Charging Guide

This is a typical charging termination condition setting problem. It may be because absorption time is set too short or float voltage is set too high. Adjust parameters according to battery type.

Related page: Battery Charging Guide

Reduced solar radiation in winter is normal. Consider: increasing solar panel power, enabling temperature compensation to ensure correct charging, reducing load usage to lower discharge.

Related page: Battery Charging Guide

Yes. If a lithium battery has been locked by under-voltage protection after deep discharge, the controller runs a low-current activation program that gradually brings the cell voltage back into the normal range and then resumes normal charging automatically.

Related page: MPPT Battery Charging Best Practices | SUNOPEN Blog

Partial shading creates several peaks on the panel's P-V curve. SUNOPEN's MPPT algorithm (improved perturb-and-observe combined with incremental conductance) sweeps quickly and locks onto the global maximum power point instead of a local one, so it keeps harvesting the maximum energy the conditions allow.

Related page: Why MPPT Efficiency Matters in Solar Systems | SUNOPEN Blog

The controllers are rated from -35°C to +65°C, so they keep charging in severe cold and high heat. The optional communication modules (BL01, NET01/NET02/NET03) are rated from -30°C to +75°C, which keeps the whole monitoring chain reliable in extreme climates.

Related page: MPPT Solar Charge Controllers | Boost & Buck

The controllers are IP20 indoor devices. For outdoor installation, mount the controller inside an enclosure rated IP54 or higher to protect it from rain, dust and salt mist. The NET communication modules are IP30 and can be placed inside the same enclosure.

Related page: MPPT Solar Charge Controllers | Boost & Buck

Yes. Above roughly 3000 m the thinner air reduces cooling efficiency, so the controller should be derated and not run at full power for long periods. Improve ventilation or add forced cooling when installing at altitude in warm climates.

Related page: MPPT Solar Charge Controllers | Boost & Buck

Controllers ship as Modbus RTU slaves at address 1, 9600 bps, 8 data bits, no parity, 1 stop bit. Supported function codes: 0x03 (read holding registers), 0x04 (read input registers), 0x06 (write single register), 0x10 (write multiple registers). RS485 (differential, up to 1200 m) and TTL are standard on all models.

Related page: Bluetooth/WiFi/4G Communication Modules

You can request a quote by filling out the contact form on our website or by emailing [email protected] directly. Our sales team typically responds within 24 hours. Please include your voltage requirements, current specifications, and intended application for the most accurate quote.

Related page: Contact & Quotation

Contact us via email or the contact form with your project details including application type (street lighting, security, telecom, etc.), system voltage, panel wattage, and quantity. We respond within 24 hours with a customized solution.

Related page: Contact & Quotation

For standard products, we accept small trial orders. For OEM/ODM customizations for off-grid projects like traffic safety systems or industrial monitoring, please contact us to discuss MOQ based on your specific requirements.

Related page: Contact & Quotation

Standard MPPT controller orders typically ship within 7-15 working days. Custom OEM/ODM orders may require 30-45 days depending on specifications and order quantity. We offer express shipping options for urgent requirements.

Related page: Contact & Quotation

The website is structured for global B2B product and technical inquiries, with multilingual site content.

Provide battery voltage/chemistry, PV module specifications, load profile, operating environment and required communication features to SUNOPEN technical support.

Compare battery voltage, PV electrical limits, power/current rating, topology, battery charging requirements, thermal conditions, communication needs and certifications against the project specification.

Include product/application, battery voltage and chemistry, PV configuration, load profile, quantity, target market, certifications and delivery requirements.

Our MPPT controllers undergo rigorous testing and meet international quality standards, ensuring reliable performance in harsh off-grid environments from desert solar farms to Arctic weather stations.

Related page: About SUNOPEN

Yes. Our engineering team provides free technical support for solar system sizing, controller selection, and integration guidance for applications ranging from solar street lights to remote telecom base stations.

Related page: Contact & Quotation

Yes, SUNOPEN provides comprehensive OEM and ODM services. Our R&D team can customize MPPT solar controllers to meet specific voltage, current, power ratings, communication protocols, and form factor requirements. Contact us to discuss your custom development needs.

Related page: Contact & Quotation

Yes, SUNOPEN offers comprehensive OEM and ODM services with strong R&D capabilities. We can customize MPPT controllers to meet specific voltage, current, communication protocol, and form factor requirements. With 12+ years of experience and 450+ technology patents, we serve clients in over 135 countries.

Related page: SUNOPEN MPPT Solar Controllers

Yes, SUNOPEN offers OEM/ODM services for bulk orders. We can customize voltage ranges, charging profiles, communication protocols, and enclosure designs for specific off-grid applications like traffic safety systems or industrial monitoring.

Related page: MPPT Product Range

Yes, SUNOPEN offers comprehensive OEM and ODM services for B2B customers. With strong R&D teams and manufacturing capabilities, we can customize MPPT solar controllers to meet specific voltage, current, power, and communication protocol requirements. Contact our sales team to discuss your custom solar controller needs.

Related page: MPPT Product Range

Yes. We offer one-stop customized solar solutions including system design, controller selection, battery configuration, and remote monitoring integration for any off-grid application from solar billboard lighting to remote pipeline monitoring.

Related page: System Solutions

Yes. B2B OEM/ODM inquiries can include target specifications, quantities, enclosure requirements, communications, certifications and customization needs.

Ask the technical team with the exact requirement. Whether customization is possible depends on the product platform and project scope.

Yes, request the applicable product documentation for the model under consideration. Final specifications should be verified against the documentation.

Yes, for B2B projects subject to technical and commercial requirements.

SUNOPEN states that it supports B2B OEM/ODM projects. Final feasibility depends on product, volume, technical requirements and project scope.

B2B technical consultation, product selection, OEM/ODM discussions and project support.