PowMr POW-M Series Low Frequency Inverter User Manual

PowMr POW-M Series Low Frequency Inverter

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:
  • a. Anyone lacking the relevant knowledge, experience, or capability for safe installation and/or operation requirements.
  • b. Anyone with impaired or diminished physical, sensory, or intellectual capabilities that may affect safe installation and/or operation (including children).

Controller Installation and Operation

1. This controller product has no user-serviceable parts. Do not dismantle or attempt to repair the controller.
2. Install the controller in an environment with good natural ventilation and ensure sufficient spacing around it.
3. Mount the controller on a non-flammable wall and ensure there are no flammable materials nearby; temperature elevation during controller operation is normal.
4. 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.
5. 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.
6. Do not place any other items on top of the controller.

Battery Installation and Charging

1. Install and charge batteries in a well-ventilated or exhaust environment.
2. Ensure there are no sources of ignition around the batteries, as they release explosive gases.
3. Battery acid is corrosive; if battery acid comes into contact with the skin, immediately rinse with clean water.
4. Do not charge non-rechargeable batteries. Do not charge lithium batteries when the temperature is below 0°C. Charging frozen batteries is prohibited.
5. Ensure the equipment is set up reasonably according to the connected battery type.

DC Battery Wiring

1. Ensure all cables and/or new ports connecting to the battery/DC system are fully closed/disconnected in advance.
2. Use flexible multi-strand copper cables with appropriate cross-sectional areas and connect them to matching fuses or circuit breakers.
3. It is prohibited to connect the solar array to the controller without the battery connected; priority must be given to connecting the battery.

Controller Settings

1. Refer to the battery manufacturer’s guide and specifications to ensure the batteries are suitable for the controller and confirm the recommended charging settings.
2. Integrated charging modes include adaptive charging logic, which is suitable for most battery types.

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.
  • a. Products beyond the warranty period.

Product 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.

Features

• Integrated Charging Presets
  The integrated charging modes include adaptive charging logic, making them suitable for most battery types, such as flooded lead-acid, sealed gel, and lithium batteries. Specific charging parameters for each battery type can be found in section 3.7.

• Flexible Application
  Compatible with 12V/24V system voltages.

• 25A/35A/45A Charging Controllers
  Available in 25A, 35A, and 45A charging current options to meet the needs of various solar energy storage systems.

• Multi-Stage Charging Algorithm
  The multi-stage charging algorithm is designed to optimize each charging cycle, maintaining battery charge through preset charging parameters for specific stages once the battery is fully charged.

• Maximum Power Point Tracking Technology
  MPPT technology tracks the maximum power point voltage (Vmp) of the array, which varies with weather conditions, ensuring maximum power is collected from the array throughout the day.

• Efficient Charging
  Innovative MPPT technology with tracking efficiency up to 99.9% and peak conversion efficiency up to 97%, reducing power consumption, heat generation, and operating temperature.

• Adaptive Boost Charging
  During initial charging, adaptive boost charging monitors the battery’s response and automatically determines the appropriate boost stage duration for each independent charging cycle. This ensures the battery is fully charged at any discharge level or capacity, avoiding overcharging during the boost stage, thereby extending battery life.

• Durable and Safe

  • a. Overcurrent protection for PV input
  • b. PV array short circuit protection
  • c. PV reverse polarity protection
  • d. Battery overvoltage protection
  • e. Battery over-discharge protection
  • f. Over-temperature protection

• Accurate Battery Temperature Monitoring
  When the battery temperature exceeds 80℃, temperature compensation is automatically performed, reducing charging power to protect the battery.

• Lithium Battery Activation
  Compatible with lithium batteries, the charging cycle will adapt when the battery type parameter is set to lithium. If the connected lithium battery is in protection mode, the controller will activate the lithium battery using energy from the solar panels, with current not exceeding the lithium battery protection voltage and protection current range.

• Warning : Do not charge lithium batteries when their temperature is below 0℃.

Product Appearance

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

Installation and Wiring

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

Selecting Installation Location
Before installation, consider the following aspects to determine/provide a suitable and safe installation location:

Wiring Precautions

1. Installation and wiring should be carried out by a certified electrician.
2. Follow this sequence when wiring: Battery > PV Input > DC Output.
3. 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.
4. 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.

Installation and Wiring Guide

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.

Operation Guide

Button Introduction

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.

Key Introduction

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
****| Short Press| Confirms and saves settings
Long Press| Restores factory settings

Operation Mode Description

Note : In case of a fault, the operation mode section will display the fault code. For details, please refer to section 4.2.

Overview of PV Parameters
Short press the button, and the data on the left side of the screen will switch as follows.

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 key to confirm the settings.

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 key to save and confirm.

Battery Type Selection

Please select the battery type according to the table below based on the connected battery:

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 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 3.7 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.

Default Parameters for Different Battery Types

• For Lead-acid Batteries and User-defined Batteries:
  Battery Type

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
MPP Tracking Return Voltage| 13.2V| 13.2V| 13.2V| 9.0~17.0V

• For Lithium-Ion Batteries:**
  Battery Type**

Parameter

| ****

N03

| ****

N06

| ****

N07

---|---|---|---
Boost Charge Voltage| 12.5V| 25.0V| 29.2V
Float Charge Voltage| 12.2V| 24.4V| 28.5V
MPP Tracking Return Voltage| 11.7V| 23.4V| 27.3V

• For LiFePO4 Batteries:**
  Battery Type**

Parameter

| ****

L04

| ****

L07

| ****

L08

---|---|---|---
Boost Charge Voltage| 14.5V| 25.4V| 29.0V
Float Charge Voltage| 13.8V| 24.1V| 27.6V
MPP Tracking Return Voltage| 13.2V| 23.1V| 26.4V

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.

Three stages of lead-acid battery charging:

Two stages of lithium battery charging:

Protection

Protection Functions

Photovoltaic array

short circuit

| When a short circuit occurs in the photovoltaic array, the controller will

cease charging. Rectifying the short circuit fault will restore operation.

Photovoltaic input overcurrent

| The controller limits the battery charging current to the maximum rated value. Therefore, an overcurrent from the photovoltaic array will prevent

operation at peak power.

Load overcurrent protection

| When the load current reaches its rated value, the controller automatically shuts down the DC output. It will recheck the output after

5 minutes to detect if overcurrent persists.

Photovoltaic

polarity reversal

| If the photovoltaic wiring polarity is reversed, the controller will not

operate. Correct connection is necessary to restore normal operation.

Battery polarity

reversal

| Similarly, if the battery wiring polarity is reversed, the controller will not

function until correct connection is restored.

Overtemperature

| When the controller’s heatsink temperature exceeds 65°C, it automatically begins reducing the charging current. If it exceeds 80°C,

the controller shuts down automatically.

Troubleshooting

When a fault occurs, the controller will display a fault signal (as shown in the diagram below) to assist you in identifying solutions.

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 “3.7 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.

73

| Overcharging

current

72

| Overdischarging

current

| Reduce output terminal load to ensure total load is

within rated limits of the controller and battery.

Maintenance

We recommend conducting the following checks and maintenance at least twice a year to ensure optimal performance:

1. Ensure the controller is securely mounted in a clean and dry environment.
2. Ensure proper airflow around the controller and clean any dust or debris from the heat sinks.
3. 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.
4. Tighten all terminals and check for loose, broken, or burnt cable connections.
5. Confirm that all system components are properly grounded.
6. Ensure all terminals are free from corrosion, insulation damage, high temperatures, or signs of burning/discoloration, and tighten terminal screws.
7. 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.

Specification Parameters

Solar Input Parameters
Max. PV Open-Circuit Voltage| 100V
Max. Input Power:| | |
For 12V System For 24V System| 300W

600W

| 420W

840W

| 540W

1080W

Input Voltage Range:| | |
For 12V System For 24V System| <60V

<60V

| <80V

<80V

| <100V

<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

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