1. Introduction
Welcome to the POW-M series solar controllers, a forefront innovation in solar technology designed to provide exceptional performance and reliability for your solar system. Our meticulously designed controllers incorporate advanced digital control technology, featuring an LCD screen and user-friendly buttons to enhance configuration flexibility, allowing real-time monitoring of operational data and system status. Additionally, the controllers support Maximum Power Point Tracking (MPPT) battery charging mode, maximizing energy utilization efficiency.
The POW-M series solar controllers are engineered to meet diverse solar system requirements, whether in standalone systems or other application scenarios. They automatically control the battery charging and discharging processes, optimizing these operations to extend battery life and improve overall system performance. Equipped with self-detection and electronic protection functions, the controllers effectively prevent damage during installation errors or system malfunctions, ensuring system reliability and stability.
Our POW-M series solar controllers offer extensive expandability and customization options, streamlining the solar system configuration process. Whether you are building a standalone solar system or expanding a solar energy project, the POW-M series controllers will be an indispensable partner. Their compact size and lightweight design, combined with air-cooled and aluminum alloy backplate natural cooling technologies, enhance operational safety, stability, and suitability for various scenarios. The parallel function allows users to easily scale up their solar energy capacity.
The POW-M series solar controllers are available in 25A, 35A, and 45A charging current options, ensuring your solar system can efficiently capture and store energy. Whether you are seeking an efficient, sustainable, and secure energy management solution or providing robust support for future energy demands, the POW-M series solar controllers are your ideal choice. We are committed to advancing solar technology, offering you exceptional products and services to support your solar system construction.
Product Overview Video
This video provides an overview of the PowMr MPPT Solar Charge Controller, including unboxing, components, and a quick demonstration of installation steps and features.
2. Important Safety Guidelines
Warning: Please carefully read and adhere to all safety instructions.
- Before installing and operating the controller, carefully read the user manual and keep it stored safely for future reference.
- Installation or operation of the controller is not permitted for the following individuals without strict guidance and supervision:
- Anyone lacking the relevant knowledge, experience, or capability for safe installation and/or operation requirements.
- Anyone with impaired or diminished physical, sensory, or intellectual capabilities that may affect safe installation and/or operation (including children).
Controller Installation and Operation Safety
- This controller product has no user-serviceable parts. Do not dismantle or attempt to repair the controller.
- Install the controller in an environment with good natural ventilation and ensure sufficient spacing around it.
- Mount the controller on a non-flammable wall and ensure there are no flammable materials nearby; temperature elevation during controller operation is normal.
- Install the controller in an environment free from direct sunlight, rainwater, humidity, and dust, and keep it away from any flammable liquids or gases. The controller is for indoor use only.
- Do not install or place/operate the controller on top of or directly above batteries or in enclosed spaces containing batteries, as batteries release explosive gases.
- Do not place any other items on top of the controller.
Battery Installation and Charging Safety
- Install and charge batteries in a well-ventilated or exhaust environment.
- Ensure there are no sources of ignition around the batteries, as they release explosive gases.
- Battery acid is corrosive; if battery acid comes into contact with the skin, immediately rinse with clean water.
- Do not charge non-rechargeable batteries. Do not charge lithium batteries when the temperature is below 0°C. Charging frozen batteries is prohibited.
- Ensure the equipment is set up reasonably according to the connected battery type.
3. Product Appearance and Features
Features
- Integrated Charging Presets: Adaptive charging logic suitable for most battery types (flooded lead-acid, sealed gel, lithium).
- Flexible Application: Compatible with 12V/24V system voltages.
- 25A/35A/45A Charging Controllers: Available in 25A, 35A, and 45A charging current options.
- Multi-Stage Charging Algorithm: Optimizes charging cycles and maintains battery charge.
- Maximum Power Point Tracking Technology (MPPT): Tracks maximum power point voltage (Vmp) for efficient energy collection.
- Efficient Charging: Tracking efficiency up to 99.9% and peak conversion efficiency up to 97%.
- Adaptive Boost Charging: Monitors battery response to determine appropriate boost stage duration, extending battery life.
- Durable and Safe: Includes overcurrent protection for PV input, PV array short circuit protection, PV reverse polarity protection, battery overvoltage protection, battery over-discharge protection, and over-temperature protection.
- Accurate Battery Temperature Monitoring: Automatically performs temperature compensation when battery temperature exceeds 80°C.
- Lithium Battery Activation: Activates lithium batteries in protection mode using solar panel energy.
Product Views
Product Components
| No. | Component | No. | Component |
|---|---|---|---|
| 1 | LCD Display | 5 | Load Interface |
| 2 | Function Buttons | 6 | Port Cover |
| 3 | PV Input Interface | 7 | Heat Sink |
| 4 | Battery Interface | 8 | Mounting Holes |
4. Installation and Wiring
4.1 Unboxing and Inspection
Before unboxing, check if the packaging is damaged. After unboxing, inspect the contents for any damage or missing items. Inside the package, you will find:
- Controller
- User Manual
- Dedicated Mounting Screws
- Installation Guide Card
4.2 Selecting Installation Location
Before installation, consider the following aspects to determine/provide a suitable and safe installation location:
- Install the controller in a space with good natural ventilation/exhaust.
- Avoid direct sunlight.
- Ensure there is sufficient clearance around the controller. The minimum clearance for the top, bottom, and sides of the controller is 75mm.
- Mount the controller on a non-flammable wall and ensure there are no flammable materials nearby; temperature elevation during controller operation is normal.
- Install the controller in an environment free from direct sunlight, rainwater, humidity, and dust, and keep it away from any flammable liquids or gases. The controller is for indoor use only.
- Do not install or place/operate the controller on top of the battery, directly above it, or in an enclosed space where the battery is located, as the battery may release explosive gases.
4.3 Wiring Precautions
- Installation and wiring should be carried out by a certified electrician.
- Follow this sequence when wiring: Battery > PV Input > DC Output.
- To avoid short circuits and reverse polarity, ensure that the positive (+) cable is connected to the positive (+) terminal of the equipment and the negative (-) cable to the negative (-) terminal.
- Undersized or loose connections can cause cables or terminals to overheat. Therefore, tighten all cables to minimize transitional resistance. Use cables of appropriate size according to the current of the specific circuit.
4.4 Installation and Wiring Guide
Step 1. Install the controller: Install the controller vertically with the ports facing downward. Secure it to the wall using screws through the four mounting holes on the body. For easier installation, it is recommended to "hang" the equipment using the two upper screws first, then add the two lower screws, and finally secure all four screws completely.
Step 2. Battery wiring: Connect the battery to the controller using cables.
NOTICE:
- If an inverter needs to be connected, please refer to the diagram above.
- All wiring work must be performed by professionals.
- For safe operation and proper application, corresponding breakers must be installed on the cables connected to the controller, and ensure all connections are tight.
- Ensure all breakers are in the OFF position before completing all wiring.
- Connect the positive cable terminal to the positive port and the negative cable terminal to the negative port.
- The above precautions also apply to PV ports and DC output ports.
Step 3. PV wiring: Connect the PV array to the controller using cables.
Step 4. DC output wiring: Connect the load to the controller using cables.
Step 5. Pre-start check: Refer to the wiring diagram. If all connections are accurate and secure, close the battery and PV array breakers in sequence.
WARNING: Risk of electric shock!
- Ensure all power sources are off before wiring, and follow appropriate inspection and operation procedures.
5. Operation Guide
5.1 Button Introduction
| No. | Function |
|---|---|
| 1 | Day/Night Indicator |
| 2 | Indicates remaining battery power. |
| 3 | Operation mode (see "5.3 Operation Mode Description"). |
| 4 | Load periodic operation status and alert status (see "7.2 Troubleshooting"). |
| 5 | Indicates PV input voltage/power. |
| 6 | Indicates current battery voltage/charging current/device temperature/battery calibration voltage/battery type/boost charging voltage/float charging voltage/DC under-voltage recovery voltage/DC under-voltage cutoff voltage. |
| 7 | Indicates load operation mode. |
5.2 Key Introduction
| Function key | Description |
|---|---|
| PV / ↑ | Browsing Mode: Switches PV input parameter information |
| BAT/↑ | Browsing Mode: Short press switches battery information (to the next option) Long press: Enters battery parameter settings Setup Mode: Increases the value |
| DC/↓ | Browsing Mode: Switches battery information (to the previous option) Long press: Enters load operation mode settings Setup Mode: Decreases the value |
| SET / * | Short Press: Confirms and saves settings Long Press: Restores factory settings |
5.3 Operation Mode Description
| Code | Description |
|---|---|
| 3.0 | Night mode, not charging |
| 4.0 | Fast charging mode (MPPT mode) |
| 7.0 | Boost charging mode |
| 8.0 | Float charging mode |
Note: In case of a fault, the operation mode section will display the fault code. For details, please refer to section 7.2.
5.4 Overview of PV Parameters
Short press the PV / ↑ button, and the data on the left side of the screen will switch to display various PV input parameters.
5.5 Battery Parameters Overview
In browse mode, use the BAT/↑ and DC/↓ keys to scroll through the battery parameters. When you reach the parameter you want to set, long press the BAT/↑ key to enter parameter setting mode. Once in the specified parameter setting, adjust the value size or toggle options using the BAT/↑ and DC/↓ keys, then press the SET / * key to confirm the settings.
5.6 Battery Parameter Settings
Below are the configurable settings for battery-related parameters:
Battery Calibration Voltage
When there is a discrepancy between the battery voltage monitored by the controller and the value measured by a multimeter, you can calibrate the battery voltage using this setting. Long press the BAT/↑ key to enter the setting program. Use the BAT/↑ and DC/↓ keys to adjust the value size, then press the SET / * key to save and confirm.
Battery Type Selection
Please select the battery type according to the table below based on the connected battery:
| Sequence | Display | Battery Type |
|---|---|---|
| 1 | SEL | Sealed lead-acid battery |
| 2 | GEL | Gel sealed lead-acid battery |
| 3 | FLd | Flooded lead-acid battery |
| 4 | L04 | 4S Lithium iron phosphate battery |
| 5 | L07 | 7S Lithium iron phosphate battery |
| 6 | L08 | 8S Lithium iron phosphate battery |
| 7 | N03 | 3S Lithium-ion battery |
| 8 | N06 | 6S Lithium-ion battery |
| 9 | N07 | 7S Lithium-ion battery |
| 10 | USE | User-defined |
Long press the BAT/↑ key to enter the setting program. Use the BAT/↑ and DC/↓ keys to toggle through the battery type options, then press the SET / * key to save and confirm. If you select User-defined battery type, you can proceed with setting the following battery parameters.
Custom Configuration of Charging Voltage
NOTICE:
- If the battery type is set to "USE" (User-defined mode), you can manually adjust the following 5 charging parameters.
- If "USE" is not selected, manual adjustment of charging parameters is not required. The controller will charge based on preset values corresponding to the battery type. Refer to section 5.7 for preset charging values.
System Voltage Setting Interface
System voltage options: 12V/24V.
Boost Charging Voltage Setting Interface
Default: 14.4V, adjustable range: 9.0~17.0V, step size: 0.1V.
Float Charging Voltage Setting Interface
Default: 13.8V, adjustable range: 9.0~17.0V, step size: 0.1V.
Under-voltage Recovery Voltage Setting Interface
Default: 12.6V, adjustable range: 9.0~17.0V, step size: 0.1V.
Under-voltage Cut-off Voltage Setting Interface
Default: 11.0V, adjustable range: 9.0~17.0V, step size: 0.1V.
5.7 Default Parameters for Different Battery Types
For Lead-acid Batteries and User-defined Batteries:
| Parameter | FLd | GEL | SEL | USE |
|---|---|---|---|---|
| Boost Charge Voltage | 14.6V | 14.2V | 14.4V | 9.0~17.0V |
| Float Charge Voltage | 13.8V | 13.8V | 13.8V | 9.0~17.0V |
| Low Voltage Cutoff Voltage | 11.0V | 11.0V | 11.0V | 9.0~17.0V |
| Low Voltage Recovery Voltage | 12.6V | 12.6V | 12.6V | 9.0~17.0V |
For Lithium-Ion Batteries:
| Parameter | N03 | N06 | N07 |
|---|---|---|---|
| Boost Charge Voltage | 12.5V | 25.0V | 29.2V |
| Float Charge Voltage | 12.2V | 24.4V | 28.5V |
| Low Voltage Cutoff Voltage | 8.4V | 16.8V | 19.6V |
| Low Voltage Recovery Voltage | 9.0V | 18.0V | 21.0V |
For LiFePO4 Batteries:
| Parameter | L04 | L07 | L08 |
|---|---|---|---|
| Boost Charge Voltage | 14.5V | 25.4V | 29.0V |
| Float Charge Voltage | 13.8V | 24.1V | 27.6V |
| Low Voltage Cutoff Voltage | 11.2V | 19.6V | 22.4V |
| Low Voltage Recovery Voltage | 12.0V | 21.0V | 24.0V |
NOTICE:
- The charging parameters for lead-acid and user-defined batteries in the above table are based on a 12V system voltage. For 24V system voltage, multiply these values by 2. Similarly, for lead-acid or user-defined battery types with a system voltage of 24V, the actual charging voltage will be twice the displayed voltage on the monitor.
Charging Stages
6. Maintenance
We recommend conducting the following checks and maintenance at least twice a year to ensure optimal performance:
- Ensure the controller is securely mounted in a clean and dry environment.
- Ensure proper airflow around the controller and clean any dust or debris from the heat sinks.
- Inspect all exposed wires for insulation damage, such as severe sun exposure, friction wear, dryness, insect or rodent damage. Repair or replace any damaged wires as necessary.
- Tighten all terminals and check for loose, broken, or burnt cable connections.
- Confirm that all system components are properly grounded.
- Ensure all terminals are free from corrosion, insulation damage, high temperatures, or signs of burning/discoloration, and tighten terminal screws.
- Check for dirt, nesting insects, and corrosion. If present, clean promptly.
WARNING: Risk of electric shock!
- Before performing the above operations, ensure that all power sources are turned off and then follow the relevant check and operation guidelines.
7. Troubleshooting
When a fault occurs, the controller will display a fault signal to assist you in identifying solutions.
| Fault Code | Fault Cause | Solution |
|---|---|---|
| 18 | Input photovoltaic voltage too low | Increase the number of solar panels or connect them in series to raise the photovoltaic input voltage. |
| 60 | Overtemperature protection | Allow the equipment to cool to below the recovery temperature to resume normal charging and discharging. |
| 63 | Battery voltage too high | Measure to confirm if battery voltage exceeds rated voltage and disconnect photovoltaic array circuit breaker. |
| 65 | Battery voltage too low | Charge the battery until voltage exceeds the undervoltage recovery point. Refer to "5.7 Default Parameters for Different Battery Types" for specific details. |
| 71 | Input photovoltaic voltage too high | Reduce the number of photovoltaic arrays connected to the controller to lower photovoltaic input; or adjust series and parallel connections to reduce voltage or current values. |
| 72 | Overdischarging current | Reduce output terminal load to ensure total load is within rated limits of the controller and battery. |
8. Specifications
| Model | 25A | 35A | 45A |
|---|---|---|---|
| Solar Input Parameters | |||
| Max. PV Open-Circuit Voltage | 100V | ||
| Max. Input Power: | |||
| For 12V System | 300W | 420W | 540W |
| For 24V System | 600W | 840W | 1080W |
| Input Voltage Range: | |||
| For 12V System | <60V | <80V | <100V |
| For 24V System | <60V | <80V | <100V |
| Battery Charging Parameters | |||
| Charging Technology | MPPT | ||
| Charging Algorithm | 3 Stages | ||
| Nominal System Voltage | 12V/24V | ||
| Battery Voltage Range | 9~30V | ||
| Rated Charging Current | 25A | 35A | 45A |
| Conversion Efficiency | ≤98% | ||
| Max. Power Point Tracking Efficiency | >99% | ||
| Temperature Compensation | -3mV/°C/2V (default) | ||
| Self-Consumption | 44mA/12V; 26mA/24V | ||
| DC Output Parameters | |||
| Rated DC Output Current | 15A | 20A | 25A |
| General Parameters | |||
| IP Class | IP32 | ||
| Operating Temperature Range | -35°C~+45°C | ||
| Humidity Range | ≤95% Non-condensing | ||
| Altitude | <3000m | ||
| Dimensions | 160x115x51mm | 195x135x65mm | 195x135x65mm |
| Net Weight | 500g | 900g | 1035g |
9. Warranty and Support
Disclaimer
In any of the following circumstances, our company reserves the right to disclaim liability for quality assurance:
- Damage caused by improper transportation.
- Damage resulting from incorrect storage, installation, or usage.
- Damage caused by non-professionals or untrained personnel installing and using the equipment.
- Damage resulting from failure to adhere to the instructions and safety warnings in this document.
- Damage caused by operation in environments not meeting the requirements specified in this document.
- Damage resulting from operation beyond the parameters specified in the applicable technical specifications.
- Damage caused by unauthorized dismantling, alteration of the product, or modification of software code.
- Damage caused by exceptional natural circumstances (force majeure), such as lightning, earthquakes, fires, storms, etc.
- Any damage resulting from failure to follow local standards and regulations during installation and operation processes.
- Products beyond the warranty period.
Contact Information
SHENZHEN HEHEJIN INDUSTRIAL CO.,LTD
- Tel/Fax: +86 755-28219903
- Email: support@powmr.com
- Web: www.powmr.com
- Address: Henggang Street, Longgang District, Shenzhen, Guangdong, China
10. User Tips
- Installation Check: If your controller is not functioning as expected after installation, double-check all wiring connections to ensure they are secure and follow the correct sequence (Battery > PV Input > DC Output). Ensure all breakers are in the OFF position before making connections.
- Dimensions and Compatibility: Always verify the product dimensions and specifications against your planned installation space and system requirements before purchase to ensure proper fit and compatibility.
