PowMr Solar Inverter Charger User Manual

Models: POW-HVM2H-12V-N, POW-HVM3.2H-24V-N

1. About This Manual

This manual provides assembly, installation, operation, and troubleshooting information for the PowMr Solar Inverter Charger. Please read it carefully before use and keep it for future reference.

Purpose: To guide users through the installation and operation of the unit.
Scope: Includes safety and installation guidelines, tools, and wiring information.

2. Safety Instructions

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

Read all instructions and cautionary markings before using the unit.
Use only deep-cycle lead-acid type rechargeable batteries.
Do not disassemble the unit; contact a qualified service center for repairs.
Disconnect all wiring before maintenance or cleaning. Turning off the unit does not eliminate electrical risk.
CAUTION: Only qualified personnel should install this device with a battery.
Never charge a frozen battery.
Use appropriate cable size for optimum operation and safety.
Be cautious when working with metal tools around batteries to avoid sparks or short circuits.
Follow installation procedures carefully when disconnecting terminals.
A 150A fuse is provided for over-current protection for the battery supply.
Ensure the inverter/charger is connected to a permanent grounded wiring system, complying with local requirements.
Never short-circuit AC output and DC input. Do not connect to the mains when the DC input is short-circuited.
Only qualified service persons should service this device. Contact a local dealer or service center for persistent errors.

3. Introduction

The PowMr Solar Inverter Charger is a multi-function device combining inverter, solar charger, and battery charger capabilities. It offers uninterruptible power support with a portable size and features a comprehensive LCD display for user-configurable settings.

3.1 Features

Pure sine wave inverter
Configurable input voltage range via LCD setting
Configurable battery charging current via LCD setting
Configurable AC/Solar Charger priority via LCD setting
Compatible with mains voltage or generator power
Auto restart when AC recovers
Overload, over-temperature, and short-circuit protection
Smart battery charger design for optimized battery performance
Cold start function
WIFI/GPRS (Optional)
Can connect to lithium battery

3.2 Basic System Architecture

A typical system includes the inverter/charger, generator or utility power, PV modules, and external battery packs. Consult a system integrator for specific architectures.

This inverter can power various appliances, including motor-type appliances like lights, fans, refrigerators, and air conditioners.

Figure 1. Hybrid Power System Diagram

A diagram shows a solar panel connected to the inverter, a generator/utility connected to the inverter, and the inverter connected to a battery pack and home appliances. Arrows indicate power flow.

3.3 Product Overview

The front panel of the inverter features:

1. LCD display: Shows operating status and power information.
2. Status indicator: Indicates operational status.
3. Charging indicator: Shows charging status.
4. Fault indicator: Indicates faults.
5. Function buttons: ESC, UP, DOWN, ENTER for navigation and selection.
6. Power on/off switch: Controls the unit's power.
7. AC input: Connection for AC power source.
8. AC output: Connection for load output.
9. PV input: Connection for solar panels.
10. Battery input: Connection for battery bank.
11. RS-232 communication port: For data communication.

4. Installation

4.1 Unpacking and Inspection

Verify that the package contains the unit and the user manual. Inspect for any damage.

4.2 Preparation

Remove the bottom cover by unscrewing two screws before connecting any wiring.

4.3 Mounting the Unit

Mount on a solid, non-combustible surface.
Install at eye level for easy LCD visibility.
Ensure proper ventilation: 20 cm clearance on the sides, 50 cm above and below.
Optimal operating temperature: 0°C to 55°C.
Mount vertically.

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

Use M4 or M5 screws for installation.

4.4 Battery Connection

CAUTION: Install a separate DC over-current protector or disconnect device between the battery and inverter.

WARNING: All wiring must be performed by a qualified personnel. Use appropriate cable for battery connection.

Recommended battery cable size:

Model	Wire Size	Cable (mm²)	Torque value (max)
2.0KVA 12V	1 x 2AWG	35	2 Nm
3.2KVA 24V	1 x 2AWG	35	2 Nm

Follow these steps for battery connection:

Remove insulation sleeve 18 mm from conductors.
Apply bootlace ferrules to the ends of positive and negative wires using a crimping tool.
Connect battery packs as shown in the diagrams for 2.0KVA/12V and 3.2KVA/24V models.
Insert battery wires into connectors and tighten bolts to 2 Nm clockwise. Ensure correct polarity.

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

CAUTION!! Ensure correct polarity (+ to +, - to -) before making the final DC connection.

4.5 AC Input/Output Connection

CAUTION!! Install a separate AC breaker between the inverter and AC input power source (10A for 2.0KVA, 32A for 3.2KVA).

CAUTION!! Do not mis-connect input and output connectors (marked "IN" and "OUT").

WARNING! All wiring must be performed by a qualified personnel. Use appropriate cable for AC input connection.

Suggested cable requirement for AC wires:

Model	Gauge	Torque Value
2.0KVA 12V	14 AWG	0.5~0.6Nm
3.2KVA 24V	12 AWG	1.2 Nm

Follow these steps for AC input/output connection:

Open the DC protector or disconnector before making AC connections.
Remove insulation sleeve 10mm for conductors. Shorten phase L and neutral N conductors by 3 mm.
Connect the PE protective conductor first (yellow-green), then L (brown or black), and finally N (blue) to the terminal block. Tighten screws.
Connect AC output wires similarly, ensuring correct polarity.
Ensure all wires are securely connected.

CAUTION: Allow 2-3 minutes for appliances like air conditioners to restart after a power shortage to prevent damage.

4.6 PV Connection

CAUTION: Install a DC circuit breaker between the inverter and PV modules before connecting.

WARNING! Use appropriate cable for PV module connection.

Model	Wire Size	Torque value (max)
2.0KVA 12V	1x16AWG	1.2 Nm
3.2KVA 24V

PV Module Selection:

Ensure PV module parameters meet the inverter's specifications:

Open circuit Voltage (Voc) of PV modules must not exceed the inverter's maximum PV array open circuit voltage.
Open circuit Voltage (Voc) of PV modules should be higher than the minimum battery voltage.

INVERTER MODEL	2.0KVA/3.2KVA
Max. PV Array Open Circuit Voltage	400Vdc
PV Array MPPT Voltage Range	30Vdc~400Vdc

Example configurations for 250Wp PV modules:

Solar Panel Spec. (reference)	SOLAR INPUT (Min in serial: 4 pcs, max. in serial: 12 pcs)		Q'ty of panels
- 250Wp - Vmp: 30.1Vdc - Imp: 8.3A - Voc: 37.7Vdc - Isc: 8.4A - Cells: 60	4 pcs in serial	4 pcs	1000W
	6 pcs in serial	6 pcs	1500W
	8 pcs in serial	8 pcs	2000W
	10 pcs in serial	10 pcs	2500W

PV Module Wire Connection:

Remove insulation sleeve 10 mm for conductors.
Apply bootlace ferrules to the ends of positive and negative wires with a proper crimping tool.
Connect PV module wires to the PV input connectors, ensuring correct polarity (+ to +, - to -). Use a 4mm blade screwdriver.

4.7 Final Assembly

Replace the bottom cover and secure it with four screws after all wiring is completed.

5. Operation

5.1 Power ON/OFF

Press the On/Off switch located on the bottom of the unit to turn it on after installation and battery connection.

5.2 Operation and Display Panel

The front panel includes indicators, function keys, and an LCD display:

LCD display: Shows operating status and input/output power information.
LED Indicators:

AC/INV: Green (Solid On: Utility mode, Flashing: Battery/PV mode)
CHG: Green (Solid On: Battery fully charged, Flashing: Battery charging)
FAULT: Red (Solid On: Fault, Flashing: Warning)

Function Keys:

ESC: Exit setting mode.
UP: Go to previous selection.
DOWN: Go to next selection.
ENTER: Confirm selection or enter setting mode.

5.3 LCD Display Icons

The LCD display provides information on:

Input Source Information: AC input, PV input.
Input/Battery/Output Parameters: Voltage, frequency, current, power, load percentage, load in VA/Watt.
Configuration Program and Fault Information: Displays setting programs, warning codes, and fault codes.
Battery Information: Battery level (0-24%, 25-49%, 50-74%, 75-100%) and charging status.

5.4 LCD Setting

Press and hold ENTER for 3 seconds to enter setting mode. Use UP/DOWN to select programs and ENTER to confirm.

Program	Description	Selectable Option	Explanation
00	Exit setting mode	00 ESC	Escape
01	Output source priority	01 056 (Utility first)	Utility provides power to loads first.
		01 056 (Solar first)	Solar energy provides power to loads first. Utility may assist if solar is insufficient.
		01 560 (SBU priority)	Battery provides power to loads only when utility and solar are unavailable or insufficient.
		01 560 (Solar + Utility)	Solar energy provides power to loads first. Utility assists if solar is insufficient. Battery assists if both are insufficient.
02	Maximum charging current	02 10A	Sets total charging current for solar and utility chargers.
		02 20A
		02 30A
		02 40A
		02 50A, 02 60A, 02 70A, 02 80A
03	AC input voltage range	03 APL (Appliances)	90-280VAC
03	AC input voltage range	03 UPS	170-280VAC
05	Battery type	05 8Gn (AGM)	Default
		05 FLd (Flooded)
		05 USE (User-Defined)	Allows setting battery charge voltage and low DC cut-off voltage.
06	Auto restart when overload occurs	06 Lfd (Disable)	Restart disable
06	Auto restart when overload occurs	06 LFE (Enable)	Restart enable
07	Auto restart when over temperature occurs	07 Erd (Disable)	Restart disable
07	Auto restart when over temperature occurs	07 EYE (Enable)	Restart enable
09	Output frequency	09 50 (50Hz)	Default
09	Output frequency	09 60 (60Hz)
10	Output voltage	10 220 (220V)
		10 230 (230V)	Default
		10 240 (240V)
11	Maximum utility charging current	11 2A
		11 10A	Default
		11 20A
		11 30A
		11 40A, 11 50A, 11 60A
12	Setting voltage point back to utility source	12 21.0V	Available for 3.2KVA 24V model
		12 21.5V
		12 22.0V
		12 22.5V
		12 23.0V (default)
		12 23.5V
		12 24.0V
		12 24.5V
		12 25.0V
		12 25.5V
13	Setting voltage point back to battery mode	12 10.5V	Available for 2.0KVA 12V model
		12 11.0V
		12 11.5V (default)
		12 12.0V
		12 12.5V
		12 13.0V
		12 13.5V
		12 14.0V
		12 14.5V
		12 15.0V
13	Battery fully charged voltage	13 24V (3.2KVA 24V)	Available for 3.2KVA 24V model
		13 24.5V
		13 25.0V
		13 25.5V
		13 26.0V
		13 26.5V
		13 27.0V (default)
		13 27.5V
		13 28.0V
		13 28.5V, 13 29.0V
13	Battery fully charged voltage	13 FUL (2.0KVA 12V)	Available for 2.0KVA 12V model
		13 12.0V
		13 12.5V
		13 13.0V
		13 13.5V (default)
		13 14.0V
		13 14.5V
		13 15.0V
		13 15.5V
		13 16.0V, 13 16.5V, 13 17.0V
16	Charger source priority	16 C50 (Solar first)	Solar energy charges battery first. Utility charges only when solar is unavailable.
		16 SNU (Solar and Utility)	Solar and utility charge battery simultaneously.
		16 050 (Only Solar)	Solar energy is the sole charging source.
18	Alarm control	18 600 (Alarm on)	Default
18	Alarm control	18 60F (Alarm off)
19	Auto return to default display screen	19 ESP (Default)	Returns to default display after 1 minute of inactivity.
19	Auto return to default display screen	19 HEP (Stay at latest screen)	Stays on the last viewed screen.
20	Backlight control	20 LON (Backlight on)	Default
20	Backlight control	20 LOF (Backlight off)
22	Beeps while primary source is interrupted	22 AON (Alarm on)	Default
22	Beeps while primary source is interrupted	22 AOF (Alarm off)
23	Overload bypass	23 698 (Bypass disable)	Default
23	Overload bypass	23 698 (Bypass enable)	Transfers to line mode during overload in battery mode.
25	Record Fault code	25 FEN (Record enable)	Default
25	Record Fault code	25 Fd5 (Record disable)
26	Bulk charging voltage (C.V voltage)	26 14.1V (2.0KVA 12V)	Default: 14.1V (2.0KVA 12V), 28.2V (3.2KVA 24V). Range: 12.5-15.5V (2.0KVA), 25.0-31.5V (3.2KVA). Increment: 0.1V.
26	Bulk charging voltage (C.V voltage)	26 28.2V (3.2KVA 24V)
27	Floating charging voltage	27 13.5V (2.0KVA 12V)	Default: 13.5V (2.0KVA 12V), 27.0V (3.2KVA 24V). Range: 12.5-15.5V (2.0KVA), 25.0-31.5V (3.2KVA). Increment: 0.1V.
27	Floating charging voltage	27 27.0V (3.2KVA 24V)
29	Low DC cut-off voltage	29 10.0V (2.0KVA 12V)	Default: 10.0V (2.0KVA 12V), 20.0V (3.2KVA 24V). Range: 10.0-12.0V (2.0KVA), 20.0-24.0V (3.2KVA). Increment: 0.1V.
29	Low DC cut-off voltage	29 20.0V (3.2KVA 24V)
30	Battery equalization	30 EEN (Enable)	Enables battery equalization.
30	Battery equalization	30 EdS (Disable)	Default
31	Battery equalization voltage	31 14.6V (2.0KVA 12V)	Default: 14.6V (2.0KVA 12V), 29.2V (3.2KVA 24V). Range: 13.0-16.2V (2.0KVA), 25.0-31.5V (3.2KVA). Increment: 0.1V.
31	Battery equalization voltage	31 29.2V (3.2KVA 24V)
33	Battery equalized time	33 60 (60min)	Setting range: 5-900 min. Increment: 5 min.
34	Battery equalized timeout	34 120 (120min)	Setting range: 5-900 min. Increment: 5 min.
35	Equalization interval	35 30d (30 days)	Setting range: 0-90 days. Increment: 1 day.
36	Equalization activated immediately	36 AEN (Enable)	Activates equalization immediately. LCD shows "E9".
36	Equalization activated immediately	36 AdS (Disable)	Default. Cancels equalization until next scheduled time.

5.5 Display Setting

Cycle through display information using UP/DOWN keys. Information includes input/output voltage, frequency, PV voltage/current/power, charging current/power, battery voltage, load percentage, load in VA/Watt, and CPU version.

5.6 Operating Mode Description

The inverter operates in different modes:

Standby mode / Power saving mode: Unit is off but can charge batteries. In power saving mode, output may be off if load is low.
Fault mode: Indicates errors due to internal or external issues.
Line Mode: Unit provides power from the mains and charges the battery.
Battery Mode: Unit provides power from battery and PV.

5.7 Battery Equalization Description

Equalization function reverses negative chemical effects like stratification and removes sulfate crystals, improving battery capacity. Enable equalization via program 30 and apply it via program 35 (interval) or 36 (immediate activation).

When to Equalize: Equalization starts when the interval is reached or activated immediately.

Equalize charging time and timeout: The controller charges until battery voltage reaches equalization voltage, then maintains it. If voltage doesn't reach the target within the timeout, equalization may be extended or stopped.

6. Clearance and Maintenance for Anti-Dust Kit (Optional)

6.1 Overview

The anti-dust kit helps regulate internal temperature and protects the inverter from dust in harsh environments.

6.2 Clearance and Maintenance

Remove screws to detach the dustproof case.
Remove the air filter foam.
Clean the air filter foam and dustproof case. Re-assemble the unit.

NOTICE: Clean the anti-dust kit monthly.

7. Specifications

Table 1. Line Mode Specifications

	INVERTER MODEL
	2.0KVA-12V	3.2KVA-24V
Input Voltage Waveform	Sinusoidal (utility or generator)
Nominal Input Voltage	230Vac
Low Loss Voltage	170Vac±7V (UPS); 90Vac±7V (Appliances)	180Vac±7V (UPS); 100Vac±7V (Appliances)
Low Loss Return Voltage	280Vac±7V	270Vac±7V
High Loss Voltage	300Vac
High Loss Return Voltage	50Hz / 60Hz (Auto detection)
Nominal Input Frequency	40±1Hz
Low Loss Frequency	42±1Hz
Low Loss Return Frequency	65±1Hz
High Loss Frequency	63±1Hz
High Loss Return Frequency	Circuit Breaker
Output Short Circuit Protection	>95% (Rated R load, battery full charged )
Efficiency (Line Mode)	10ms typical (UPS); 20ms typical (Appliances)
Transfer Time
Output power derating:	When AC input voltage drops to 170V, the output power will be derated.

Output Power Derating Diagram

A graph shows output power derating based on input voltage. Rated power is maintained until 170V, then decreases to 50% power at 90V.

Table 2. Inverter Mode Specifications

	2.0KVA-12V	3.2KVA-24V
Rated Output Power	2000VA/1600W	3200VA/3000W
Output Voltage Waveform	Pure Sine Wave
Output Voltage Regulation	230Vac±5%
Output Frequency	50Hz
Peak Efficiency	94%
Overload Protection	5s@ ≥150% load; 10s@ 100% ~ 150% load
Surge Capacity	2* rated power for 5 seconds
Nominal DC Input Voltage	12Vdc	24 Vdc
Cold Start Voltage	11.5Vdc	23.0Vdc
Low DC Warning Voltage	11.0Vdc (@load < 50%) 10.5Vdc (@load ≥50%)	22.0Vdc (@load < 50%) 21.0Vdc (@load ≥50%)
Low DC Warning Return Voltage	11.5 Vdc (@load < 50%) 11.0 Vdc (@load ≥50%)	22.5 Vdc (@load < 50%) 22.0Vdc (@load ≥50%)
Low DC Cut-off Voltage	10.2Vdc (@load < 50%) 9.6 Vdc (@load ≥50%)	20.5 Vdc (@load < 50%) 20.0Vdc (@load ≥50%)
High DC Recovery Voltage	14.0Vdc	32Vdc
High DC Cut-off Voltage	16.0Vdc	33Vdc
No Load Power Consumption	<25W	<35W

Table 3. Charge Mode Specifications

	Utility Charging Mode
	INVERTER MODEL	2.0 KVA-12V	3.2KVA-24V
Charging Algorithm	3-Step
AC Charging Current (Max)	60 Amp (@V_L/P= 230Vac)
Bulk Charging Voltage	Flooded Battery: 14.6 AGM / Gel Battery: 14.1	Flooded Battery: 29.2 AGM / Gel Battery: 28.2
Floating Charging Voltage	13.5Vdc (2.0KVA 12V) / 27Vdc (3.2KVA 24V)

Charging Curve Diagram

A graph shows battery charging stages: Bulk (Constant Current), Absorption (Constant Voltage), and Maintenance (Floating), illustrating voltage and current changes over time.

MPPT Solar Charging Mode

	INVERTER MODEL	2.0KVA-12V
Max. PV Array Power	2000W	3000W
Nominal PV Voltage	240Vdc
PV Array MPPT Voltage Range	30~400Vdc
Max. PV Array Open Circuit Voltage	400Vdc
Max Charging Current	80Amp (AC charger plus solar charger)

Table 4. General Specifications

	INVERTER MODEL	2.0KVA-12V
Safety Certification	CE
Operating Temperature Range	-10°C to 50°C
Storage temperature	-15°C~60°C
Humidity	5% to 95% Relative Humidity (Non-condensing)
Dimension (DWH), mm	357X273X95
Net Weight, kg	4.6	4.8

8. Trouble Shooting

Problem	LCD/LED/Buzzer	Explanation / Possible cause	What to do
Unit shuts down automatically during startup process.	LCD/LEDs and buzzer will be active for 3 seconds and then complete off.	The battery voltage is too low (<1.91V/Cell)	1. Re-charge battery. 2. Replace battery.
No response after power on.	No indication.	1. The battery voltage is far too low. (<1.4V/Cell) 2. Internal fuse tripped.	1. Contact repair center for replacing the fuse. 2. Re-charge battery. 3. Replace battery.
Mains exist but the unit works in battery mode.	Input voltage is displayed as 0 on the LCD and green LED is flashing.	Input protector is tripped	Check if AC breaker is tripped and AC wiring is connected well.
	Green LED is flashing.	Insufficient quality of AC power. (Shore or Generator)	1. Check if AC wires are too thin and/or too long. 2. Check if generator (if applied) is working well or if input voltage range setting is correct. (UPS Appliance)
	Green LED is flashing.	Set "Solar First" as the priority of output source.	Change output source priority to Utility first.
When the unit is turned on, internal relay is switched on and off repeatedly.	LCD display and LEDs are flashing	Battery is disconnected.	Check if battery wires are connected well.
Buzzer beeps continuously and red LED is on.	Fault code 07	Overload error. The inverter is overload 110% and time is up.	Reduce the connected load by switching off some equipment.
	Fault code 05	Output short circuited.	Check if wiring is connected well and remove abnormal load.
	Fault code 02	Temperature of internal converter component is over 120°C. Internal temperature of inverter component is over 100°C.	Check whether the air flow of the unit is blocked or whether the ambient temperature is too high.
	Fault code 03	Battery is over-charged.	Return to repair center.
	Fault code 01	The battery voltage is too high.	Check if spec and quantity of batteries are meet requirements.
	Fault code 06/58	Fan fault	Replace the fan.
	Fault code 08/09/53/57	Output abnormal (Inverter voltage below than 190Vac or is higher than 260Vac)	1. Reduce the connected load. 2. Return to repair center
	Fault code 51	Internal components failed.	Return to repair center.
	Fault code 52	Over current or surge.	Restart the unit, if the error happens again, please return to repair center.
	Fault code 55	Bus voltage is too low.

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