1. Introduction
The PowMr POW-M25/M35/M45-PRO MPPT Solar Charge Controller is an advanced intelligent regulator designed for efficient solar energy management. It is compatible with various battery types, including rich liquid lead-acid, gel, sealed lead-acid, and lithium batteries, supporting 12V/24V system voltages. This controller utilizes Maximum Power Point Tracking (MPPT) technology to maximize power harvest from solar panels and features a multi-stage charging algorithm for optimal battery health and longevity.
Key Features:
- Integrated Charging Preset: Adaptive charging logic suitable for most battery types (lead-acid, gel, sealed, lithium).
- Flexible Application: Compatible with 12V/24V system voltage.
- 25A/35A/45A Charging Controller: Available in 25A, 35A, and 45A models to meet various solar energy storage system requirements.
- Multi-Stage Charging Algorithm: Optimizes each charging cycle and maintains battery power through preset parameters.
- Maximum Power Point Tracking (MPPT) Technology: Tracks the maximum power point voltage (Vmp) of the solar array, ensuring maximum power collection with up to 99.9% tracking efficiency and 97% peak conversion efficiency.
- Adaptive Boost Charging: Enhances charging response and automatically determines boost phase duration to ensure full battery charge and extend battery life.
- Durable and Secure: Features comprehensive protection against photovoltaic input overcurrent, PV array short circuit, PV polarity reversal, battery overvoltage, battery over-discharge, and overtemperature.
- Accurate Battery Temperature Monitoring: Performs temperature compensation and reduces charging power if battery temperature exceeds 80℃.
- Lithium Battery Activation: Adjusts charging cycles for lithium batteries and can activate protected lithium batteries using solar panel energy.
Warning: Do not charge lithium batteries when their temperature is below 0 ℃.
2. Product Appearance and Components
Familiarize yourself with the physical components of your PowMr MPPT Solar Charge Controller.
| No. | Component |
|---|---|
| 1 | LCD Display |
| 2 | Function Buttons |
| 3 | PV Input Interface |
| 4 | Battery Interface |
| 5 | Load Interface |
| 6 | Port Cover |
| 7 | Heat Sink |
| 8 | Mounting Holes |
3. Technical Specifications
The following table details the technical specifications for the PowMr POW-M25/M35/M45-PRO MPPT Solar Charge Controllers.
| Models | 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/℃/2V (default) | ||
| Self-Consumption | 44mA/12V; 26mA/24V | ||
| Environmental Parameters | |||
| Operating Temperature Range | -35℃~+45℃ | ||
| Humidity Range | ≤95% Non-condensing | ||
| Altitude | <3000m | ||
| General Parameters | |||
| IP Class | IP32 | ||
| Dimensions | 160x115x51mm | 195x135x65mm | 195x135x65mm |
| Net Weight | 500g | 900g | 1035g |
4. Installation and Wiring Guide
4.1 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.
4.2 Installation Steps
Step 1. 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 below.
NOTICE:
- 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 below. 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
| Function Key | Mode | Description |
|---|---|---|
PV /  | Browsing Mode | Switches PV input parameter information |
BAT /  | Browsing Mode | Short press: Switches battery information (to the next option) |
| Setup Mode | Long press: Enters battery parameter settings Increases the value | |
DC /  | Browsing Mode | Short press: Switches battery information (to the previous option) |
| Setup Mode | Long press: Enters load operation mode settings Decreases the value | |
SET /  | Short Press | Confirms and saves settings |
| Long Press | Restores factory settings |
5.2 LCD Display Indicators
| No. | Function |
|---|---|
| ① | Day/Night Indicator |
| ② | Indicates remaining battery power. |
| ③ | Operation mode (see "3.3 Operation Mode Description" in the full manual). |
| ④ | Load periodic operation status and alert status (see "4.2 Troubleshooting" in the full manual). |
| 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. |
The controller supports automatic detection of 12V/24V/36V/48V batteries and is compatible with GEL, FLD (Flooded), SLD (Sealed), LFE (LiFePO4), USE (User-defined), and LI (Lithium) battery types.
6. Maintenance
Regular maintenance ensures the optimal performance and longevity of your PowMr MPPT Solar Charge Controller and connected battery system.
- Connection Integrity: Periodically check all wiring connections (PV, battery, load) to ensure they are tight and free from corrosion. Loose connections can lead to overheating and reduced efficiency.
- Environmental Conditions: Ensure the controller is installed in a well-ventilated area, away from direct sunlight, moisture, and extreme temperatures. The operating temperature range is -35℃ to +45℃.
- Temperature Monitoring: The controller accurately monitors battery temperature and will automatically reduce charging power if the battery temperature exceeds 80℃ to protect the battery. Ensure proper ventilation around the battery to prevent excessive heat buildup.
- Adaptive Charging: The controller's adaptive boost charging feature helps extend battery life by optimizing each charging cycle. No user intervention is typically required for this feature.
- Protection Features: The controller includes multiple protection mechanisms (overcurrent, short circuit, reverse polarity, overvoltage, over-discharge, overtemperature). If any protection is triggered, identify and resolve the underlying issue before resuming operation.
- Lithium Battery Care: If using lithium batteries, ensure they are not charged when their temperature is below 0℃, as this can cause damage.
- Cleaning: Keep the controller's exterior clean and free from dust and debris. Use a dry, soft cloth for cleaning. Do not use harsh chemicals or abrasive materials.
7. Troubleshooting
The LCD display provides alert statuses and operational information that can assist in troubleshooting. For detailed troubleshooting steps and error codes, please refer to section "4.2 Troubleshooting" in the comprehensive user manual (if a PDF is available) or contact customer support.
Common Issues and General Advice:
- No Display/Power: Check battery connections and ensure the battery has sufficient charge. Verify all breakers are closed.
- No Charging: Check PV panel connections, ensure sufficient sunlight, and verify PV input voltage is within the specified range. Check for PV array short circuits or reverse polarity.
- Load Not Working: Check load connections, ensure the load is not exceeding the controller's capacity, and verify load operation mode settings.
- Overheating: Ensure adequate ventilation around the controller and battery. Check for loose or undersized wiring connections.
- Incorrect Readings: Ensure battery type settings are correctly configured for your battery.
If you encounter persistent issues, please record any error messages or unusual behavior and contact PowMr customer support for assistance.
8. Warranty and Support
PowMr products are designed for reliability and performance. For warranty information, technical support, or service inquiries, please refer to the warranty card included with your product or contact your point of purchase. You can also visit the official PowMr website for the latest support resources and contact details.
Please retain your proof of purchase for warranty claims.
