PowMr POW-HVM4.2K-24V-D Solar Inverter Charger

Introduction

This is a multifunctional off-grid solar inverter, which integrates an MPPT solar charging controller, a high-frequency pure sine wave inverter, and a UPS function module. It is very suitable for off-grid backup power supply and spontaneous self-use systems. The design of a high-frequency transformer enables the machine to provide reliable power conversion in a small size.

The whole system also needs other equipment to achieve complete operation, such as photovoltaic modules, a generator, or a utility grid. According to your requirements, please consult your system integrator for other possible system components. A WiFi module is a plug-and-play monitoring device that can be installed on the inverter. With this device, users can monitor the running status of the solar system anytime and anywhere through mobile phones or websites.

Features

• The machine can use two battery voltage modes, with a maximum load of 2300W in 12V battery mode and 4200W in 24V battery mode.
• Pure sine wave output inverter.
• According to the requirements of load (household appliances/personal computers), the input voltage range of the utility grid can be selected.
• According to the battery requirements, the charging current can be set through LCD.
• Solar energy and utility grid can power loads at the same time.
• AC input is compatible with mains and generator.
• Automatic restart function when mains power is restored.
• Overload/ Over temperature/ short circuit protection.
• The intelligent charging design of the battery makes the battery more fully utilized.
• RS485 port used for communication with BMS.
• Cold start function.
• Built-in MPPT, operating voltage range 55V~500V, open circuit voltage 500Voc.
• WIFI remote monitoring (optional).
• RGB lamp, which displays different colors according to inverter status (optional).

Basic System Architecture

The following illustrates the basic application for this inverter/charger. It also includes the following devices to have a complete running system:

• Generator or mains electricity ⚡
• Solar module ☀️ (optional)
• External Battery packs ?
• Home Appliances ?

Consult with your system integrator for other possible system architectures depending on your requirements. This inverter can power all kinds of appliances in a home or office environment, including motor-type appliances such as tube lights, fans, refrigerators, and air conditioners.

Product Overview

The front panel of the inverter includes:

• 1. LCD screen
• 2. Status indicator
• 3. Charging indicator
• 4. Fault indicator
• 5. Function keys
• 6. Power on/off switch

The rear panel includes:

• 7. AC input terminal
• 8. AC output terminal
• 9. PV input terminal
• 10. Battery input terminal
• 11. Circuit breaker
• 12. Ground wire terminal ?
• 13. BMS communication port ?
• 14. RS232 communication port ?

A diagram shows a typical hybrid power system connecting Solar, Generator/Utility, Battery, and Home Appliances to the inverter.

Installation

Unpacking and Inspection

Unpack the inverter and make sure there are no damaged objects in the package. You should have received the following items inside of the package:

• Machine x 1
• User manual x 1

Preparation Before Installation

Before connecting all wiring, please take off the bottom cover by removing two screws as shown in the diagram.

Installation Guidelines

Please consider the following points before installing the equipment:

1. Do not install the inverter on flammable building materials.
2. Install on a solid surface.
3. Install this inverter at eye level in order to allow the LCD display to be read at all times.
4. Leave a gap of 20-50 cm for ventilation and heat dissipation of the equipment.
5. The equipment working environment temperature should be 0-55°C.
6. It is best to install it vertically down against the wall, leaving a certain space with the ground.

SUITABLE FOR INSTALLATION ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE ONLY

Tighten the screws and fix the installation. Machine fixing screws: M4 or M5 screws are recommended.

Battery Connection

Lead-Acid Battery Connection

WARNING: In order to operate safely and comply with laws and regulations, it is required to install an independent DC overcurrent protector or disconnect device between the battery and the inverter.

WARNING: All wiring must be performed by a qualified personnel.

WARNING: It's very important for system safety and efficient operation to use appropriate cable for battery connection. To reduce risk of injury, please use the proper recommended cable as below.

Note: The recommended charging current of lead-acid battery is 0.2C (C is battery capacity).

Please follow below steps to implement battery connection:

1. Connect the battery according to the recommended battery cable specifications.
2. Connect all battery packs as needed.
3. Insert the ring terminal of the battery cable into the battery connector of the inverter flatly, and ensure that the bolts are tightened with a torque of 2-3 Nm. Make sure that the polarities of the battery and inverter are connected correctly, and tighten the ring terminal with the battery terminal.

WARNING: Shock Hazard. Installation must be performed with care due to high battery voltage in series.

CAUTION: Do not place anything between the flat part of the inverter terminal and the ring terminal, otherwise, it may cause short circuit or overheating.

CAUTION: Do not apply antioxidant to the terminal before it is tightly connected.

CAUTION: Before making the final DC connection or closing the DC breaker/disconnector, be sure positive (+) must be connected to positive (+) and negative (-) must be connected to negative(-).

A diagram shows battery connections for 12V and 24V models, illustrating how multiple batteries are wired in series.

Lithium Battery Connection

If choosing lithium battery for the inverter, only lithium batteries that have been matched with BMS communication protocol are allowed.

1. Connect the battery according to the recommended battery cable specifications.
2. Insert the ring terminal of the battery cable into the battery connector of the inverter flatly, and ensure that the bolts are tightened with a torque of 2-3 Nm. Make sure that the polarities of the battery and inverter are connected correctly, and that the ring terminal is tightened with the battery terminal.
3. Connect one side of the RJ45 cable to the BMS communication port of the inverter.
4. Insert the other side of the RJ45 cable into the RS485 communication port on the lithium battery.

Note: If you choose a lithium battery, please make sure to connect the battery and inverter with a BMS communication cable, and select the battery type as "LIB" mode.

Communication And Setting Of Lithium Battery

1. Connect the RJ45 communication cable between the inverter and battery. Please confirm that the lithium battery BMS port's PIN corresponds with the inverter BMS communication port. The inverter BMS port's PIN definition is as follows:

A diagram shows the RJ45 connector pinout.

2. In order to communicate with the lithium battery BMS, you should press the "ENTER" button for a long time, and set the battery type as "LIB" in program 05. Then select the matching battery protocol in Program 10.

In "LIB" mode, press and hold the "ESC" button to view the information of the lithium battery, and the inverter display screen will enter the following screen (the initial interface shows the total battery voltage and remaining battery capacity). Press the "DOWN" button to display the following data in turn:

• Battery voltage
• Battery charging current
• The rated capacity of the battery
• BMS board temperature
• The maximum voltage of single battery cell
• The remaining battery capacity
• Battery discharge current
• Cycle charge and discharge times
• MOS temperature
• The minimum voltage of single battery cell
• The maximum temperature of single battery
• The minimum temperature of single battery

Battery Alarm Code

Battery Fault Code

AC Input/Output Connection

CAUTION: Before connecting to the AC input power source, please install a separate AC breaker between the inverter and AC input power source. This will ensure the inverter can be securely disconnected during maintenance and fully protected from over current of AC input.

CAUTION: There are two terminal blocks with "IN" and "OUT" markings. Please do NOT misconnect input and output connectors.

WARNING: All wiring must be performed by a qualified personnel.

WARNING: It's very important for system safety and efficient operation to use appropriate cable for AC input connection. To reduce risk of injury, please use the proper recommended cable size as below.

Please follow below steps to implement AC input/output connection:

1. Before making AC input/output connection, be sure to open the DC protector or disconnector first.
2. Remove insulation sleeve 10mm for six conductors. Shorten phase L and neutral conductor N by 3 mm.
3. Insert AC input wires according to polarities indicated on the terminal block and tighten the terminal screws. Be sure to connect the PE protective conductor ? first.
• PE → Ground (yellow-green)
• L → LINE (brown or black)
• N → Neutral (blue)

A diagram shows the AC input terminal block with L, N, and PE connections.

WARNING: Be sure that AC power source is disconnected before attempting to hardwire it to the unit.

4. Then, insert the AC output conductor according to the polarity identification at the terminal, and tighten the screw.
• L → LINE (brown or black)
• N → Neutral (blue)

A diagram shows the AC output terminal block with L, N, and PE connections.

5. Make sure the wires are firmly connected.

CAUTION: Please ensure that all AC cables are connected correctly according to the corresponding polarity.

CAUTION: Appliances such as air conditioners are required at least 2~3 minutes to restart because it's required to have enough time to balance refrigerant gas inside of circuits. If a power shortage occurs and recovers in a short time, it will cause damage to your connected appliances. To prevent this kind of damage, please check the manufacturer of the air conditioner if it's equipped with a time-delay function before installation. Otherwise, this inverter will trigger an overload fault and cut off output to protect your appliance, but sometimes it still causes internal damage to the air conditioner.

PV Connection

CAUTION: Before connecting the PV module, please install a separate DC circuit breaker between the inverter and PV module.

WARNING: All wiring must be performed by a qualified personnel.

WARNING: It's very important for system safety and efficient operation to use appropriate cable for PV module connection. To reduce risk of injury, please use the proper recommended cable size as below.

PV Module Selection:

When selecting proper PV modules, please be sure to consider below parameters:

1. Open circuit Voltage (Voc) of PV modules should not exceed the max. PV array open circuit voltage of the inverter.
2. Open circuit Voltage (Voc) of PV modules should be higher than the min battery voltage.

Take a 250Wp PV module as an example. After considering the above two parameters, the recommended module configurations are listed as below table:

Equipment Assembly

Please follow below steps to implement PV module connection:

1. Remove insulation sleeve 10 mm for positive and negative conductors.
2. Check correct polarity of connection cable from PV modules and PV input connectors. Then, connect the positive pole (+) of the connection cable to the positive pole (+) of the PV input connector. Connect the negative pole (-) of the connection cable to the negative pole (-) of the PV input connector.
3. Make sure the wires are securely connected.

Final Assembly

After connecting all the wires, put the bottom cover back and screw the screws.

Operation

Power On/Off

After installing the machine correctly and connecting the battery correctly, just press the On/Off switch to turn on the machine.

Operation and Display

The operation and display panel is shown in the following figure, which is located on the front panel of the inverter. It includes four function keys and an LCD screen for indicating operation status and input/output power information.

The front panel has an LCD display, LED indicators, and function keys (ESC, UP, DOWN, ENTER).

RGB Light (optional)

• Inverter state: green light
• Utility state: blue light
• Failure state: red light

LED Indicator

Function Keys

LCD Display Icons

The LCD screen displays various icons to indicate system status:

• Input Source Information:
• AC: Indicates the AC input.
• PV: Indicates the PV input.
• INPUT BATT: Indicates input voltage, input frequency, PV voltage, battery voltage, and charger current.
• Configuration Program and Fault Information:
• 88: Indicates the setting programs.
• 8.8 (Flashing): Flashing with warning code.
• 8.8 (Solid): Lighting with fault code.
• Output Information:
• OUTPUT BATT LOAD: Indicates output voltage, output frequency, load percent, load in VA, load in Watt, and discharging current.
• Battery Information:
• Battery level is shown by 0-24%, 25-49%, 50-74%, and 75-100% in battery mode and charging status in line mode.
• In AC mode, it will present battery charging status.

Status:

• Battery voltage: < 2V/cell (4 bars will flash in turns)
• Constant Current mode/Constant Voltage mode:
• 2 ~ 2.083V/cell (Bottom bar will be on and the other three bars will flash in turns)
• 2.083 ~ 2.167V/cell (Bottom two bars will be on and the other two bars will flash in turns)
• > 2.167 V/cell (Bottom three bars will be on and the top bar will flash)
• Floating mode: Batteries are fully charged (4 bars will be on). In battery mode, it will present battery capacity.

Load Percentage:

Load Information:

• OVER LOAD: Indicates overload.
• Load level is shown by 0-24%, 25-50%, 50-74%, and 75-100%.

Mode Operation Information:

• BYPASS: Indicates unit connects to the mains.
• ☀️: Indicates unit connects to the PV panel.
• ⚡: Indicates load is supplied by utility power.
• ⚡ (with charging icon): Indicates the utility charger circuit is working.
• ⚡ (with inverter icon): Indicates the DC/AC inverter circuit is working.
• ❌: Indicates unit alarm is disabled.

LCD Setting

After pressing and holding “ENTER” button for 3 seconds, the unit will enter setting mode. Press "UP" or "DOWN" button to select setting programs. And then, press “ENTER” button to confirm the selection or "ESC" button to exit.

Setting Programs:

Display Setting

The LCD display information will be switched in turns by pressing "UP" or "DOWN" key. The selectable information is switched as below order: input voltage, input frequency, PV voltage, MPPT charging current, MPPT charging power, battery voltage, output voltage, output frequency, load percentage, load in VA, load in Watt, DC discharging current, main CPU Version and second CPU Version.

Selectable information

Operating Mode Description

The inverter operates in different modes depending on the power source and load conditions.

Fault Code

The following table lists common fault codes, their events, and the corresponding icons displayed on the inverter.

Warning code

The following table lists common warning codes, their events, and the automatic alarms.

Battery Equalization

Equalization function is added into the charge controller. It reverses the buildup of negative chemical effects like stratification, a condition where acid concentration is greater at the bottom of the battery than at the top. Equalization also helps to remove sulfate crystals that might have built up on the plates. If left unchecked, this condition, called sulfation, will reduce the overall capacity of the battery. Therefore, it's recommended to equalize the battery periodically.

How to Apply Equalization Function

You must enable battery equalization function in monitoring LCD setting program 33 first. Then, you may apply this function in the device by either one of the following methods:

1. Setting equalization interval in program 37.
2. Active equalization immediately in program 39.

When to Equalize

In float stage, when the setting equalization interval (battery equalization cycle) is arrived, or equalization is active immediately, the controller will start to enter Equalize stage.

A diagram illustrates the battery charging stages: Bulk, Absorption, Float, Equalize. The Equalize stage shows a higher voltage level.

Equalize charging time and time out

In equalize stage, the controller will supply power to charge the battery as much as possible until the battery voltage raises to the battery equalization voltage. Then, constant voltage regulation is applied to maintain the battery voltage at the battery equalization voltage. The battery will remain in the Equalize stage until the setting battery equalized time is arrived.

However, in Equalize stage, when the battery equalized time is expired and the battery voltage doesn't rise to the battery equalization voltage point, the charge controller will extend the battery equalized time until the battery voltage achieves the battery equalization voltage. If the battery voltage is still lower than the battery equalization voltage when the battery equalized time out setting is over, the charge controller will stop equalization and return to float stage.

Clearance and Maintenance for Anti-Dust Kit (Optional)

Overview

Every inverter is already installed with an anti-dust kit from the factory. The inverter will automatically detect this kit and activate the internal thermal sensor to adjust the internal temperature. This kit also keeps dust from your inverter and increases product reliability in harsh environments.

Clearance and Maintenance

Step 1: Please remove screws as below.

Step 2: Then, remove the air filter as shown in the diagram.

Step 3: Clean the air filter. After cleaning, reinstall the dust removal net to the inverter.

NOTICE: The anti-dust kit should be cleaned from dust every one month.

Specifications

Table 1 Specification of LINE Mode

Table 2 Specification of Inverter Mode

Table 3 Specification of Charging Mode

Table 4 General specifications

Trouble Shooting

This section provides guidance on common problems, their possible causes, and recommended actions.