PowMr Hybrid Solar Inverter User Manual

1. About This Manual

1.1 Purpose

This manual describes the assembly, installation, operation, and troubleshooting of the PowMr Hybrid Solar Inverter. Please read this manual carefully before installations and operations. Keep this manual for future reference.

1.2 Scope

This manual provides safety and installation guidelines as well as information on tools and wiring for the inverter.

2. Safety Instructions

⚠ WARNING: This chapter contains important safety and operating instructions. Read and keep this manual for future reference.

1. Before using the unit, read all instructions and cautionary markings on the unit, the batteries, and all appropriate sections of this manual.
2. Do not disassemble the unit. Take it to a qualified service center when service or repair is required. Incorrect re-assembly may result in a risk of electric shock or fire.
3. To reduce risk of electric shock, disconnect all wirings before attempting any maintenance or cleaning. Turning off the unit will not reduce this risk.
4. CAUTION – Only qualified personnel can install this device with battery.
5. NEVER charge a frozen battery.
6. For optimum operation of this inverter/charger, please follow required specifications to select appropriate cable size. It's very important to correctly operate this inverter/charger.
7. Be very cautious when working with metal tools on or around batteries. A potential risk exists to drop a tool to spark or short circuit batteries or other electrical parts and could cause an explosion.
8. Please strictly follow installation procedure when you want to disconnect AC or DC terminals. Please refer to the INSTALLATION section of this manual for the details.
9. One piece of 150A fuse is provided as over-current protection for the battery supply.
10. GROUNDING INSTRUCTIONS - This inverter/charger should be connected to a permanent grounded wiring system. Be sure to comply with local requirements and regulations to install this inverter.
11. NEVER cause AC output and DC input short circuited. Do NOT connect to the mains when DC input short circuits.
12. Warning!! Only qualified service persons are able to service this device. If errors still persist after following troubleshooting table, please send this inverter/charger back to local dealer or service center for maintenance.

3. Product Overview

3.1 Features

• Pure sine wave inverter
• Configurable input voltage range for home appliances and personal computers via LCD setting
• Configurable battery charging current based on applications via LCD setting
• Configurable AC/Solar Charger priority via LCD setting
• Compatible with mains voltage or generator power
• Auto restart while AC is recovering
• Overload/ Over temperature/ short circuit protection
• Smart battery charger design for optimized battery performance
• Cold start function
• RS485 is used to communicate with BMS and adjust the charging current of inverter according to battery demand
• Can work with or without batteries
• Intelligent fan speed adjustment, which adjusts the fan speed according to temperature, load, and charging current
• Built-in MPPT, operating voltage range 55V~450V, open circuit voltage 500Voc
• RGB lamp, which displays different colors according to inverter status
• WIFI remote monitoring (optional)
• Offline upgrade function, firmware can be upgraded through COM port
• Grid-connected
• Built-in anti-dust kit for harsh environment
• In battery-free mode, PV systems deliver a better user experience when powering loads
• Equipped with lithium battery activation function

3.2 Basic System Architecture

The following illustration shows the basic application for this inverter/charger, including a generator or utility and PV modules, to form a complete running system. Consult your system integrator for other possible system architectures depending on your requirements. This inverter can power all kinds of appliances in home or office environments, including motor-type appliances such as tube lights, fans, refrigerators, and air conditioners.

This diagram illustrates how the solar inverter integrates solar power, external battery packs, and utility/generator power to supply electricity to various home appliances.

3.3 Product Overview (Physical)

The image displays the LCD screen, status indicators, charging indicator, fault indicator, and function buttons on the front panel. It also shows the AC input, main output, second output, battery input, PV input, anti-dust kit, and communication ports on the side.

The operation and display panel is located on the front of the inverter. It includes three indicators, four function keys, and an LCD display, providing operating status and input/output power information.

LED Indicators

Function Keys

LCD Display Icons (Summary)

The LCD displays various icons to indicate input source, configuration, fault information, output, battery status, and load. For a detailed explanation of each icon, please refer to the full user manual (PDF).

• Input Source Information: Icons for AC input, PV input, and numerical displays for input voltage, frequency, PV voltage, and charger current.
• Configuration Program and Fault Information: Icons for setting programs, warning codes (flashing), and fault codes (lighting).
• Output Information: Displays output voltage, frequency, load percentage, load in Watt, load in VA, and discharging current.
• Battery Information: Indicates battery status.
• Load Information: Indicates overload status.
• Mode Operation Information: Icons for unit connection to mains, PV panel, load supplied by utility, utility charger circuit, DC/AC inverter circuit, and mute operation.

4. Setup (Installation)

4.1 Unpacking and Inspection

Before installation, inspect the unit for any damage. The package should contain:

• The inverter unit x 1
• User manual x 1

4.2 Preparation

Before connecting any lines, remove the screws under the machine and remove the bottom cover plate.

4.3 Mounting the Unit

Consider the following points when selecting an installation location:

• Do not mount the inverter on flammable construction materials.
• Mount on a solid surface.
• Install this inverter at eye level for easy LCD display readability.
• Allow a clearance of approximately 20 cm to the sides and 50 cm above and below the unit for proper air circulation and heat dissipation.
• The ambient temperature should be between 0°C and 55°C for optimal operation.
• The recommended installation position is vertically on the wall.
• Ensure enough space around the machine for adequate heat dissipation and wire removal.

⚠ CAUTION: SUITABLE FOR MOUNTING ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE ONLY.

Install the unit by screwing two M6 screws.

4.4 Battery Connection

⚠ CAUTION: For safety and regulation compliance, it is recommended to install a separate DC over-current protector or disconnect device between the battery and inverter. Refer to the typical amperage in the specifications table for required fuse or breaker size.

⚠ WARNING: All wiring must be performed by qualified personnel. It is very important to use appropriate cable for battery connection to reduce risk of injury.

Recommended battery cable size:

Follow these steps for battery connection:

1. Remove insulation sleeve 18 mm for positive and negative conductors.
2. Suggest to put bootlace ferrules on the end of positive and negative wires with a proper crimping tool.
3. Connect all battery packs as shown in the diagram below (refer to the full PDF manual for detailed diagram).
4. Insert the battery wires flatly into battery connectors of the inverter and ensure the bolts are tightened with a torque of 2 Nm in a clockwise direction. Ensure correct polarity at both the battery and the inverter/charger, and that conductors are tightly screwed into the battery terminals. Recommended tool: #2 Pozi Screwdriver.

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

⚠ CAUTION!! Before making the final DC connection or closing DC breaker/disconnector, ensure positive (+) is connected to positive (+) and negative (-) is connected to negative (-).

4.5 AC Input/Output Connection

⚠ CAUTION!! Before connecting to AC input power source, install a separate AC breaker between the inverter and AC input power source. This ensures the inverter can be securely disconnected during maintenance and fully protected from overcurrent of AC input. Recommended AC breaker spec: 32A for 4.2KW and 50A for 6.2KW.

⚠ CAUTION!! There are two terminal blocks with “IN” and “OUT” markings. Do NOT mis-connect input and output connectors.

⚠ WARNING! All wiring must be performed by qualified personnel. It is very important for system safety and efficient operation to use appropriate cable for AC input connection. To reduce risk of injury, use the proper recommended cable size.

Suggested cable requirement for AC wires:

Follow these steps for AC input/output connection:

1. Before making AC input/output connection, ensure to open 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 (L→LINE (brown or black), N→Neutral (blue)).
4. ⚠ WARNING: Be sure that AC power source is disconnected before attempting to hardwire it to the unit.
5. Then, insert AC output wires according to polarities indicated on the terminal block and tighten terminal screws (L→LINE (brown or black), N→Neutral (blue)).
6. Make sure the wires are securely connected.

⚠ CAUTION: Appliances like air conditioners require 2-3 minutes to restart to balance refrigerant gas. If a power shortage occurs and recovers quickly, it can damage connected appliances. Check if your appliance has a time-delay function before installation. Otherwise, the inverter/charger may trigger overload fault and cut off output, potentially causing internal damage.

4.6 PV Connection

⚠ CAUTION: Before connecting to PV modules, install a DC circuit breaker separately between the inverter and PV modules.

⚠ WARNING! It is very important for system safety and efficient operation to use appropriate cable for PV module connection. To reduce risk of injury, use the proper recommended cable size.

Recommended PV cable size:

PV Module Selection:

When selecting proper PV modules, consider these parameters:

1. Open circuit Voltage (Voc) of PV modules must 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.

For detailed PV module wire connection steps and diagrams, please refer to the full PDF manual.

4.7 Final Assembly

After connecting all wirings, put the bottom cover back by screwing two screws.

4.8 Communication Connection

1. Wi-Fi cloud communication (optional):

Use the supplied communication cable to connect to the inverter and Wi-Fi module. Download the APP from the APP store and refer to the "Wi-Fi Plug Quick Installation Guideline" to set up the network and register. The inverter status will be shown by the mobile phone APP or computer webpage.

2. GPRS cloud communication (optional):

Use the supplied communication cable to connect to the inverter and GPRS module, then apply external power to the GPRS module. Download the APP and install it from the APP store, and refer to the "GPRS RTU Quick Installation Guideline" to set up the network and register. The inverter status will be shown by the mobile phone APP or computer webpage.

3. Battery communication:

Communication between the battery and the inverter is realized through the battery communication interface, allowing the inverter and lithium battery to exchange information (Baud rate: 9600).

4. Lithium battery and inverter connection:

If using a lithium battery with 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. Ensure correct polarities and secure connection.
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, ensure to connect the battery and inverter with a BMS communication cable, and select the battery type as "LIB-485" mode.

Communication And Setting Of Lithium Battery

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

To communicate with the lithium battery BMS, press the "ENTER" button for a long time, and set the battery type as "LIB-485" in program 05. Then select the matching battery protocol in Program 43 (e.g., PYLON or PACE).

CAUTION:

When the battery type is set to "LIB-485", the setting items 12, 13, and 29 are displayed in percentage.

5. Operating

5.1 Power ON/OFF

Once the unit is properly installed and batteries are connected, simply press the On/Off switch (located on the bottom of the case) to turn on the unit.

5.2 Operation and Display Panel

Refer to Section 3.3 for details on the LCD display, LED indicators, and function buttons.

5.3 LCD Setting (Key Settings)

After pressing and holding the ENTER button for 3 seconds, the unit will enter setting mode. Use the “UP” or “DOWN” buttons to select setting programs, and then press "ENTER" to confirm or ESC to exit. The LCD display information switches by pressing “UP” or “DOWN” keys.

Some key configurable settings include:

• Program 00: Exit setting mode / One-button restore setting options.
• Program 01: Output source priority (Utility first, Solar first, SBU priority, MKS priority).
• Program 02: Maximum charging current for solar and utility chargers.
• Program 05: Battery type (AGM, Flooded, User Defined, LIB-485).
• Program 16: Charger source priority.
• Program 26: Bulk charging voltage (C.V voltage).
• Program 27: Floating charging voltage.
• Program 29: Low DC cut-off voltage.
• Program 43: Lithium battery protocol (PYLON, PACE).

For a complete list of all LCD settings and their detailed descriptions, please consult the full PDF user manual.

5.4 Operating Mode Description

The inverter supports various operating modes:

• Standby Mode: The inverter is not turned on, but can charge batteries.
• Line Mode: The unit provides output power from the mains and can also charge the battery.
• Grid-Tie Operation: When working in Grid-Tie mode, the unit will flash (3S/times).
• Battery Mode: The unit provides output power from the battery and solar.

For detailed LCD display interfaces for each operating mode, refer to the full PDF manual.

5.5 Battery Equalization Description

Equalization function reverses the buildup of negative chemical effects like stratification and helps remove sulfate crystals, which can reduce battery capacity. It is recommended to equalize the battery periodically.

How to Apply Equalization Function:

Enable battery equalization in monitoring LCD setting program 30. Then, apply this function by either:

1. Setting equalization interval in program 35.
2. Activating equalization immediately in program 36.

When to Equalize:

In the float stage, when the set equalization interval is reached, or equalization is active immediately, the controller will enter the Equalize stage.

Equalize charging time and timeout:

In the Equalize stage, the controller charges the battery until it reaches the equalization voltage. Constant-voltage regulation maintains this voltage until the set equalized time is reached. If the battery voltage doesn't rise to the equalization voltage point when the equalized time expires, the charge controller extends the time. If the battery voltage is still lower than the equalization voltage after the timeout, equalization stops, and the system returns to the float stage.

5.6 Mains and Lithium Battery Activation Function

1. After 90 seconds of mains power connection to the inverter, the machine connects to the mains and starts to work.
2. If the inverter is in lithium battery mode (item 05 is Llb or LIb-485), and the mains are connected but the battery is not, the mains activation function is automatically enabled.

6. Maintenance (Anti-Dust Kit)

6.1 Overview

The inverter comes with a factory-installed anti-dust kit. This kit helps keep dust out, increases product reliability in harsh environments, and activates an internal thermal sensor to adjust internal temperature.

6.2 Clearance and Maintenance

1. Step 1: Loosen the screw in a counterclockwise direction on the top of the inverter.
2. Step 2: Remove the dustproof case and take out the air filter foam.
3. Step 3: Clean the air filter foam and dustproof case. After cleaning, re-assemble the dust-kit back to the inverter.

NOTICE:

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

7. Troubleshooting

This section provides common problems, their explanations, and suggested solutions. For a comprehensive list of fault and warning codes, please refer to the full PDF user manual.

Fault Reference Code (Summary)

The inverter displays various fault codes (e.g., 01-Fan is locked, 02-Over temperature, 03-Battery voltage is too high/low, 05-Output short circuited, 51-Over current/surge) indicating specific issues. When a fault occurs, the corresponding icon will be long and bright on the LCD.

Warning Indicator (Summary)

Warning codes (e.g., 01-Fan is locked, 03-Battery is over-charged, 04-Low battery, 07-Overload, E9-Battery equalization) indicate conditions that require attention. Warnings are often accompanied by an audible alarm and a flashing icon on the LCD.

If you encounter an issue, consult the troubleshooting table in the full PDF manual for detailed problem descriptions and corrective actions. If problems persist, contact customer support.

8. Specifications

Below are the detailed specifications for the PowMr Hybrid Solar Inverter models POW-HVM4.2K-24V-E and POW-HVM6.2K-48V-E.

Table 1: Line Mode Specifications

Output power derating:

When AC input voltage drops to 170V, the output power will be derated. (Refer to the full PDF manual for the derating curve diagram).

Table 2: Inverter Mode Specifications

Table 3: Two Load Output Power

Table 4: Charge Mode Specifications

MPPT Solar Charging Mode

Table 5: General Specifications

For an approximate backup time table based on load and battery capacity, refer to the full PDF manual (Appendix).

9. User Tips

• Always ensure proper ventilation around the inverter to prevent overheating, especially during high load operation.
• Regularly check battery connections for tightness and corrosion to maintain optimal performance and safety.
• When configuring battery settings, double-check the battery type and voltage to match your specific battery bank for efficient charging and discharge.
• For remote monitoring, ensure your Wi-Fi or GPRS module is correctly set up and connected to the inverter as per the quick installation guidelines.

10. Warranty and Support

For technical support, warranty claims, or service, please contact PowMr directly using the information below:

• Company: SHENZHEN HEHEJIN INDUSTRIAL CO.,LTD
• Tel/Fax: +86755-28219903
• Email: support@powmr.com
• Web: www.powmr.com
• Address: Henggang Street, Longgang District, Shenzhen, Guangdong, China

For the complete user manual with all diagrams, detailed LCD settings, and comprehensive troubleshooting tables, please refer to the official PDF document: PowMr Hybrid Inverter User Manual (PDF).