1. Introduction
1.1 About This Manual
This manual describes the assembly, installation, operation, and troubleshooting of the MUST PV1900 EXP Hybrid Solar Inverter. Please read this manual carefully before installation and operation, and keep it for future reference.
1.2 Product Overview
The MUST PV1900 EXP is a multi-function inverter/charger, combining the functions of an inverter, a 150A MPPT solar charger, and a 150A AC battery charger. It is designed to provide uninterruptible power support in a portable size. The comprehensive LCD display offers user-configurable and easy-accessible button operation for settings such as battery charging current, AC/solar charger priority, and acceptable input voltage based on different applications. The PV1900 EXP Series can operate without a battery, and its maximum PV array open circuit voltage can reach 500V, allowing for efficient utilization of solar energy.
1.3 Key Features
- Pure sine wave output.
- Smart LCD setting for working modes, charge current, charge voltage, etc.
- Built-in MPPT 150A solar charge controller and 150A AC charge controller.
- Maximum PV Array Open Circuit Voltage: 500V.
- Capable of providing power to the load without a battery.
- Combines solar system, AC utility, and battery power sources for continuous power supply.
- Overload, short circuit, and deep discharge protection.
- Cold start function.
- Supports USB and RS485 monitoring functions.
- Compatible with LiFePo4, Gel, Lead Acid, and other battery types.
- Mobile Phone APP remote monitoring (optional).
- WIFI and Parallel kit support.
- Output Source Priority Selection: SUB (Solar-Utility-Battery), SBU (Solar-Battery-Utility), SOL (Solar Only), UTI (Utility Only).
1.4 Basic System Architecture
The following diagram illustrates a basic application for this inverter/charger. It can be integrated with a generator or utility and PV modules (optional) to form a complete running system. This inverter can power various appliances in home or office environments, including motor-type appliances like tube lights, fans, refrigerators, and air conditioners.
2. Safety Instructions
⚠WARNING: This chapter contains important safety and operating instructions. Read and keep this manual for future reference.
- Before using the unit, read all instructions and cautionary markings on the unit, the batteries, and all appropriate sections of this manual.
- CAUTION: To reduce the risk of injury, charge only deep-cycle lead-acid type rechargeable batteries. Other types of batteries may burst, causing personal injury and damage.
- 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.
- To reduce the risk of electric shock, disconnect all wirings before attempting any maintenance or cleaning. Turning off the unit will not reduce this risk.
- CAUTION: Only qualified personnel can install this device with a battery.
- NEVER charge a frozen battery.
- For optimum operation of this inverter/charger, please follow the required specifications to select appropriate cable size. It is very important to correctly operate this inverter/charger.
- 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.
- Please strictly follow the installation procedure when you want to disconnect AC or DC terminals. Refer to the INSTALLATION section of this manual for details.
- Fuses (one 200A/63VDC for 8KW model, two 150A/63VDC for 10-12KW models) are provided as over-current protection for the battery supply.
- 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.
- NEVER cause AC output and DC input short circuits. Do NOT connect to the mains when DC input short circuits.
- Warning! Only qualified service persons are able to service this device. If errors still persist after following the troubleshooting table, please send this inverter/charger back to a local dealer or service center for maintenance.
3. Installation
3.1 Unpacking and Inspection
Before installation, please inspect the unit. Ensure that nothing inside the package is damaged. You should have received the following items:
- Inverter unit x 1
- User manual x 1 (This document)
- USB cable x 1
3.2 Preparation
Before connecting all wirings, remove the bottom cover by unscrewing the screws as shown in the product overview images.
3.3 Mounting the Unit
Consider the following points before selecting where to install the inverter:
- Do not mount the inverter on flammable construction materials.
- Mount on a solid surface.
- Install this inverter at eye level to allow the LCD display to be read at all times.
- For proper air circulation to dissipate heat, allow a clearance of approximately 200 mm to the side and 300 mm above and below the unit.
- The ambient temperature should be between 0°C and 55°C to ensure optimal operation.
- The recommended installation position is to adhere to the wall vertically.
- Ensure to keep other objects and surfaces as shown in the diagram to guarantee sufficient heat dissipation and to have enough space for removing wires.
⚠SUITABLE FOR MOUNTING ON CONCRETE OR OTHER NON-COMBUSTIBLE SURFACE ONLY.
3.4 Battery Connection
⚠WARNING: All wiring must be performed by qualified personnel. It is very important for system safety and efficient operation to use appropriate cables for battery connection. To reduce the risk of injury, use the proper recommended cable and terminal size as specified below.
⚠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. While a disconnect device may not be required in all applications, over-current protection is always necessary.
Recommended Battery Cable and Terminal Size:
| Model | Typical Amperage | Battery Capacity | Wire Size (each) | Cable mm² | Ring Terminal D(mm) | Ring Terminal L(mm) | Torque Value |
|---|---|---|---|---|---|---|---|
| 8KW DC48V | 160A | 200AH | 1*1/0AWG | 53 | 8.4 | 43.2 | 5 Nm |
| 10KW DC48V | 200A | 200AH | 1*3/0AWG | 85 | 8.4 | 50.2 | 5 Nm |
| 11KW DC48V | 210A | 250AH | 1*3/0AWG | 85 | 8.4 | 50.2 | 5 Nm |
| 12KW DC48V | 220A | 250AH | 1*3/0AWG | 85 | 8.4 | 50.2 | 5 Nm |
Battery Connection Steps:
- Assemble battery ring terminals based on the recommended battery cable and terminal size.
- Connect all battery packs as required by the unit. It is suggested to connect at least 200Ah capacity battery for 8KW-10KW models and at least 250Ah capacity battery for 11KW-12KW.
- Insert the ring terminal of the battery cable flatly into the battery connector of the inverter and ensure the bolts are tightened with a torque of 5 Nm. Make sure the polarity at both the battery and the inverter/charger is correctly connected, and ring terminals are tightly screwed to the battery terminals.
⚠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, overheating may occur. Do not apply anti-oxidant substance on the terminals before they are connected tightly. Before making the final DC connection or closing the DC breaker/disconnector, ensure positive (+) is connected to positive (+) and negative (-) is connected to negative (-).
3.5 AC Input/Output Connection
⚠CAUTION: Before connecting to an AC input power source, install a separate AC breaker between the inverter and the AC input power source. This ensures the inverter can be securely disconnected during maintenance and fully protected from over-current of AC input. The recommended AC breaker specification is 70A for 8-12KW models.
⚠CAUTION: There are two terminal blocks with "IN" and "OUT" markings. Do NOT misconnect 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 cables for AC input connection. To reduce the risk of injury, use the proper recommended cable size as specified below.
Suggested Cable Requirement for AC Wires:
| Model | Gauge | Torque Value |
|---|---|---|
| 8-12KW DC48V | 8 AWG | 1.4 ~ 1.6 Nm |
AC Input/Output Connection Steps:
- Before making AC input/output connections, ensure the DC protector or disconnector is open.
- Remove 10mm of insulation sleeve for twelve conductors. Shorten phase L and neutral conductor N by 3mm.
- Insert AC input wires according to the polarities indicated on the terminal block and tighten the terminal screws. Ensure to connect the PE protective conductor (ground) first.
⚠WARNING: Ensure that the AC power source is disconnected before attempting to hardwire it to the unit.
- Insert AC output wires according to the polarities indicated on the terminal block and tighten the terminal screws. Ensure to connect the PE protective conductor (ground) first.
This inverter is equipped with dual-output. There are four terminals (L1/N1, L2/N2) available on the output port. It can be set up through the LCD program or monitoring software to turn on and off the second output. Refer to the "LCD setting" section for details.
- Make sure the wires are securely connected.
⚠CAUTION: Important: Ensure to connect AC wires with correct polarity. If L and N wires are connected reversely, it may cause utility short-circuited when these inverters are operated in parallel.
⚠CAUTION: Appliances such as air conditioners require at least 2-3 minutes to restart to balance refrigerant gas. If a power shortage occurs and recovers quickly, it can damage connected appliances. Check the manufacturer's specifications for time-delay functions. Otherwise, the inverter/charger may trigger an overload fault and cut off output, but internal damage to the air conditioner may still occur.
3.6 PV Connection
⚠CAUTION: Before connecting to PV modules, install a separate DC circuit breaker between the inverter and PV modules.
⚠WARNING: All wiring must be performed by qualified personnel. It is very important for system safety and efficient operation to use appropriate cables for PV module connection. To reduce the risk of injury, use the proper recommended cable size as specified below.
Suggested Cable Requirement for PV Module Wires:
| Model | Typical Amperage | Cable Size | Torque Value |
|---|---|---|---|
| 8KW DC48V | 18A/18A | 10AWG | 1.4 ~ 1.6 Nm |
| 10-12KW DC48V | 27A/27A | 10AWG | 1.4 ~ 1.6 Nm |
PV Module Selection:
When selecting PV modules, consider the following parameters:
- The Open Circuit Voltage (Voc) of PV modules must not exceed the maximum PV array open circuit voltage of the inverter.
- The Open Circuit Voltage (Voc) of PV modules should be higher than the start-up voltage.
- The Maximum Power Voltage (Vmpp) of PV modules should be close to the best Vmp of the inverter or within the Vmp range to achieve optimal performance. If one PV module cannot meet this requirement, multiple PV modules in series connection may be necessary.
Note: Vmp refers to the panel's maximum power point voltage. PV charging efficiency is maximized when the PV system voltage is close to the Best Vmp.
Maximum PV module numbers in Series: Vmpp of PV module * X pcs = Best Vmp or Vmp range of inverter.
PV module numbers in Parallel: Max. charging current of inverter / Impp.
Total PV module numbers = maximum PV module numbers in series * PV module numbers in parallel.
Solar Charging Mode Specifications:
| INVERTER MODEL | 8-12KW DC48V |
|---|---|
| Max. PV Array Open Circuit Voltage | 500Vdc max (single model) / 450Vdc max (parallel model) |
| PV Array MPPT Voltage Range | 90~450Vdc max (single model) / 90~430Vdc max (parallel model) |
| MPPT Number | 2 |
| Start-up Voltage (VOC) | 80Vdc |
Recommended PV Module Configuration (per independent MPPT):
| PV Module Spec (reference) | Total Input Power | Solar Input 1 + Solar Input 2 | Qty of Modules |
|---|---|---|---|
| Maximum power (Pmax): 330W Max. Power Voltage (Vmpp): 38.70V Max. Power Current (Impp): 8.54A Open Circuit Voltage (Voc): 46.1V Short Circuit Current (Isc): 9.17A | 1320W | 4 pieces in series + open open + 4 pieces in series | 4pcs |
| 1980W | 6 pieces in series + open open + 6 pieces in series | 6pcs | |
| 2640W | 8 pieces in series + open open + 8 pieces in series | 8pcs | |
| 3960W | 4 pieces in series + 4 pieces in series 6 pieces in series, 2 strings in parallel + open open + 6 pieces in series, 2 strings in parallel | 12pcs | |
| 5280W | 6 pieces in series + 6 pieces in series 8 pieces in series, 2 strings in parallel + open open + 8 pieces in series, 2 strings in parallel | 16pcs | |
| 5940W | 8 pieces in series + 8 pieces in series 9 pieces in series, 2 strings in parallel + open open + 9 pieces in series, 2 strings in parallel | 18pcs | |
| 6600W | 9 pieces in series + 9 pieces in series 5 pieces in series, 2 strings in parallel + 5 pieces in series, 2 strings in parallel | 20pcs | |
| 7920W | 6 pieces in series, 2 strings in parallel + 6 pieces in series, 2 strings in parallel | 24pcs | |
| 9240W | 7 pieces in series, 2 strings in parallel + 7 pieces in series, 2 strings in parallel | 28pcs | |
| 10560W | 8 pieces in series, 2 strings in parallel + 8 pieces in series, 2 strings in parallel | 32pcs | |
| 11880W | 9 pieces in series, 2 strings in parallel + 9 pieces in series, 2 strings in parallel | 36pcs |
Connecting DC Input Power Cables:
Follow these steps to implement PV module connection:
- Remove cable glands from the positive and negative connectors.
- Take out metal terminals from the accessory package. Wiring is illustrated in the image.
- Insert the positive and negative power cables into the corresponding cable glands.
- Insert the stripped positive and negative power cables into the positive and negative metal terminals respectively and crimp them using a clamping tool. Ensure the cables are crimped until they cannot be pulled out by a force less than 400 N.
- Insert the positive and negative connectors into the corresponding DC input terminals of the Inverter until you hear a "click" sound.
Conditions for DC Connection:
The single-phase inverter has 2 independent inputs: Input A & Input B.
Suggestions for the PV modules of the connected strings:
- Same type of PV modules.
- Same quantity of PV modules connected in series.
3.7 Final Assembly
After connecting all wirings, replace the bottom cover by screwing the screws back into place.
3.8 Communication Connection
Use the supplied communication cable to connect the inverter and a PC. Download the monitoring software from the website mentioned on the first page of this manual (https://sw.mustpower.com) and follow the on-screen instructions to install it. For detailed software operation, consult the seller if you have any questions.
⚠WARNING: It is forbidden to use a network cable as the communication cable to directly communicate with the PC port or battery with BMS. Otherwise, the internal components of the controller will be damaged.
⚠WARNING: The RJ45 interface is only suitable for use with the company's supporting products or for professional operation.
RJ45 Pins Definition:
| Pin | Definition | Function |
|---|---|---|
| 1 | RS-485-B | PC communication |
| 2 | RS-485-A | |
| 3 | GND | |
| 4 | CANH | BMS communication |
| 5 | CANL | |
| 6 | ||
| 7 | ||
| 8 |
3.9 Dry Contact Signal
There is one dry contact (3A/250VAC) available on the rear panel. It can be used to deliver a signal to an external device when the battery voltage reaches a warning level.
Dry Contact Port Status:
| Unit Status | Condition | Dry Contact Port: NC&C | Dry Contact Port: NO&C |
|---|---|---|---|
| Power Off | Unit is off and no output is powered | Close | Open |
| Power On | Output is powered from Utility | Close | Open |
| Program 01 set as utility: Battery voltage < Setting value in Program 19 | Open | Close | |
| Output is powered from Battery or Solar: Program 01 set as utility: Battery voltage > Setting value in Program 21 or Program 39 or battery charging reaches floating stage | Close | Open | |
| Program 01 set as SBU, SUB, SOL: Battery voltage < Setting value in Program 20 or Program 38 | Open | Close |
4. Operation
4.1 Power ON/OFF
Once the unit has been properly installed and the batteries are connected, simply press the On/Off switch (located on the bottom of the case) to turn on the unit.
4.2 Operation and Display Panel
The operation and display panel is located on the front of the inverter. It includes three indicators, four function keys, and an LCD display, showing the operating status and input/output power information.
LED Indicator:
| LED Indicator | Color | Status | Messages |
|---|---|---|---|
| AC/INV | Green | Solid On | Output is powered by grid in Line mode. |
| Flashing | Output is powered by battery or PV in battery mode. | ||
| CHG | Yellow | Flashing | Battery is charging or discharging. |
| FAULT | Red | Solid On | Fault occurs in the inverter. |
| Flashing | Warning condition occurs in the inverter. |
Function Keys:
| Function Keys | Description |
|---|---|
| MENU | Enter reset mode or setting mode; go to previous selection. |
| UP | Increase the setting data. |
| DOWN | Decrease the setting data. |
| ENTER | Enter setting mode and confirm the selection in setting mode; go to next selection or exit the reset mode. |
4.3 LCD Display Icons
The LCD display provides detailed information about the inverter's status, input/output, and battery. Below are explanations of the icons and their meanings.
Input Source Information and Output Information:
| Icon | Function Description |
|---|---|
| --- | Indicates the AC information. |
| DC icon | Indicates the DC information. |
| 8.8.8 KW/VA/%/Hz | Indicates input voltage, input frequency, PV voltage, battery voltage, and charger current. Also indicates output voltage, output frequency, load in VA, load in Watt, and discharging current. |
Configuration Program and Fault Information:
| Icon | Function Description |
|---|---|
| 88 (Program Number) | Indicates the setting programs. |
| 88 (Error Code) | Indicates the warning and fault codes. |
| Warning: 88 (Flashing) | Flashing with warning code. |
| Fault: 88 (Solid) | Lighting with fault code. |
Battery Information:
| Icon | Function Description |
|---|---|
| Battery Level Icon | Indicates battery level 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 | LCD Display |
|---|---|---|
| <2V/cell | 4 bars will flash in turns. | |
| Constant Current mode/Constant Voltage mode | 2V/cell~2.083V/cell | Bottom bar will be on and the other three bars will flash in turns. |
| 2.083V/cell~2.167V/cell | Bottom two bars will be on and the other two bars will flash in turns. | |
| >2.167V/cell | Bottom three bars will be on and the top bar will flash. | |
| Batteries are fully charged. | 4 bars will be on. |
Load Information:
| Icon | Function Description |
|---|---|
| OverLoad | Indicates overload. |
| Load Level Icons (0-24%, 25-49%, 50-74%, 75-100%) | Indicates the load level by percentage. |
Mode Operation Information:
| Icon | Function Description |
|---|---|
| Mains Icon | Indicates unit connects to the mains. |
| PV Panel Icon | Indicates unit connects to the PV panel. |
| BYPASS | Indicates load is supplied by utility power. |
| Solar Charger Circuit Icon | Indicates the solar charger circuit is working. |
| DC/AC Inverter Circuit Icon | Indicates the DC/AC inverter circuit is working. |
| Mute Operation Icon | Indicates unit alarm is disabled. |
4.4 LCD Setting
After pressing and holding the "ENTER" button for 2 seconds, the unit will enter setting mode. Use the "UP" or "DOWN" buttons to select setting programs. Then, press "ENTER" or "MENU" to confirm the selection and exit.
Setting Programs:
The manual provides a detailed list of setting programs (00-99) with selectable options and descriptions. These settings allow configuration of output source priority, AC input voltage range, output voltage/frequency, solar supply priority, overload bypass, auto restart functions, charger source priority, battery type, charging voltages, low DC cut-off, error display, dual output, and time settings.
For a complete list of settings and their options, please refer to the original PDF user manual, pages 17-22.
4.5 Fault Reference Code
The inverter displays specific fault codes to indicate various issues. Refer to the table below for common fault codes and their causes.
| Fault Code | Fault Cause | LCD Indication |
|---|---|---|
| 01 | Fan is locked when inverter is off | ERROR 01 |
| 02 | Inverter transformer over temperature | ERROR 02 |
| 03 | Battery voltage is too high | ERROR 03 |
| 04 | Battery voltage is too low | ERROR 04 |
| 05 | Output short circuited | ERROR 05 |
| 06 | Inverter output voltage is high | ERROR 06 |
| 07 | Overload time out | ERROR 07 |
| 08 | Inverter bus voltage is too high | ERROR 08 |
| 09 | Bus soft start failed | ERROR 09 |
| 11 | Main relay failed | ERROR 11 |
| 21 | Inverter output voltage sensor error | ERROR 21 |
| 22 | Inverter grid voltage sensor error | ERROR 22 |
| 23 | Inverter output current sensor error | ERROR 23 |
| 24 | Inverter grid current sensor error | ERROR 24 |
| 25 | Inverter load current sensor error | ERROR 25 |
| 26 | Inverter grid over current error | ERROR 26 |
| 27 | Inverter radiator over temperature | ERROR 27 |
| 31 | Solar charger battery voltage class error | ERROR 31 |
| 32 | Solar charger current sensor error | ERROR 32 |
| 33 | Solar charger current is uncontrollable | ERROR 33 |
| 41 | Inverter grid voltage is low | ERROR 41 |
| 42 | Inverter grid voltage is high | ERROR 42 |
4.6 Warning Indicator
The inverter displays warning codes for non-critical conditions. Refer to the table below for common warning codes and their events.
| Warning Code | Warning Event | Icon Flashing |
|---|---|---|
| 61 | Fan is locked when inverter is on. | ERROR 61 |
| 62 | Fan 2 is locked when inverter is on. | ERROR 62 |
| 63 | Battery is over-charged. | ERROR 63 |
| 64 | Low battery | ERROR 64 |
| 67 | Overload | ERROR 67 |
| 70 | Output power derating | ERROR 70 |
| 72 | Solar charger stops due to low battery | ERROR 72 |
| 73 | Solar charger stops due to high PV voltage | ERROR 73 |
| 74 | Solar charger stops due to overload | ERROR 74 |
| 75 | Solar charger over temperature | ERROR 75 |
| 76 | PV charger communication error | ERROR 76 |
| 77 | Parameter error | ERROR 77 |
| 90 | Lithium battery full (single model) | ERROR 90 |
4.7 Operating State Description
The inverter operates in various states depending on power sources and load conditions. The LCD display provides visual cues for each state.
| Operating State | Description | LCD Display |
|---|---|---|
| Match Load State | DC power from the solar array is converted by the inverter into AC power for household appliances. Excess power is stored in the battery. | PV energy power is larger than inverter power |
| PV energy power is smaller than inverter power | ||
| PV is off | ||
| Charge State | PV energy and grid can charge batteries. | |
| Bypass State | Errors caused by internal circuit error or external reasons such as over temperature, output short circuited, etc. | |
| Off-Grid State | The inverter provides output power from battery and PV power. | Inverter power loads from PV energy. |
| Inverter power loads from battery and PV energy. | ||
| Inverter power loads from battery only. | ||
| Stop Mode | The inverter stops working if turned off by the soft key or if an error occurs with no grid. |
4.8 Display Setting
The LCD display information can be cycled through by pressing the "UP" or "DOWN" keys. Selectable information includes battery voltage, battery current, inverter voltage, inverter current, grid voltage, grid current, load in Watt, load in VA, grid frequency, inverter frequency, PV voltage, PV charging current, PV charging output voltage, and PV charging power.
Selectable Information and LCD Display:
| Selectable Information | LCD Display (Example) |
|---|---|
| Battery voltage/DC discharging current | BATT 48.0V / 48.0A |
| Inverter output voltage/Inverter output current | INV 229V / 13.0A |
| Grid voltage/Grid active power | GRID 229V / 1.00KW |
| Load in Watt/VA | LOAD 1.00KW / 1.20VA |
| Grid frequency/Inverter frequency | INPUT 50.0Hz / INV 50.0Hz |
| PV1 voltage and current | INPUT PV1 360V / 8.06A |
| PV2 voltage and current | INPUT PV2 360V / 8.06A |
| PV charger output voltage and PV charging power | OUTPUT 430V / 3.20KW |
5. Specifications
5.1 Table 1 Line Mode Specifications
| INVERTER MODEL | 8-12KW DC48V |
|---|---|
| Input Voltage Waveform | Sinusoidal (utility or generator) |
| Nominal Input Voltage | 230Vac |
| Low Loss Voltage | 90Vac±7V(APL,GEN); 170Vac±7V(UPS); 186Vac±7V(VDE) |
| Low Loss Return Voltage | 100Vac±7V(APL,GEN); 180Vac±7V(UPS); 196Vac±7V(VDE) |
| High Loss Voltage | 280Vac±7V(UPS,APL,GEN); 253Vac±7V(VDE) |
| High Loss Return Voltage | 270Vac±7V(UPS,APL,GEN); 250Vac±7V(VDE) |
| Max AC Input Voltage | 300Vac |
| Nominal Input Frequency | 50HZ/60HZ (Auto detection) |
| Low Loss Frequency | 40HZ±1HZ(UPS,APL,GEN); 47.5HZ±0.5HZ(VDE) |
| Low Loss Return Frequency | 42HZ±1HZ(UPS,APL,GEN); 48.5HZ±0.5HZ(VDE) |
| High Loss Frequency | 65HZ±1HZ(UPS,APL,GEN); 51.5HZ±0.5HZ(VDE) |
| High Loss Return Frequency | 63HZ±1HZ(APL,GEN,UPS); 50.5HZ±0.5HZ(VDE) |
5.2 Table 2 Inverter Mode Specifications
| INVERTER MODEL | 8KW DC48V | 10KW DC48V | 11KW DC48V | 12KW DC48V |
|---|---|---|---|---|
| Rated Output Power | 8000W | 10000W | 11000W | 12000W |
| Output Voltage Waveform | Pure Sine Wave | |||
| Output Voltage Regulation | 230Vac±5% | |||
| Output Frequency | 60Hz or 50Hz | |||
| Peak Efficiency | 92% | |||
| Overload Protection | 5s@≥110% load; 10s@105%~110% load | |||
| Power Limitation | Graph showing power output vs. battery voltage. | |||
| Nominal DC Input Voltage | 48Vdc | |||
| Cold Start Voltage | 46.0Vdc | |||
5.3 Table 3 Charge Mode Specifications
Utility Charging Mode:
| INVERTER MODEL | 8KW DC48V | 10-12KW DC48V |
|---|---|---|
| Nominal Voltage Range for charging | 170-260Vac | |
| Charging Current @ Nominal Input Voltage | 120Amax | 150Amax |
| Floating charging voltage (AGM / Gel/LEAD Battery) | 54.8Vdc | |
| Floating charging voltage (Flooded battery) | 54.8Vdc | |
| Bulk charging voltage (C.V voltage) (AGM / Gel/LEAD Battery) | 57.6Vdc | |
| Bulk charging voltage (C.V voltage) (Flooded battery) | 56.8Vdc | |
| Charging Algorithm | 3-Step (Flooded Battery, AGM/Gel/LEAD Battery), 4-Step (LI) | |
Solar Charging Mode:
| INVERTER MODEL | 8KW DC48V | 10KW DC48V | 11KW DC48V | 12KW DC48V |
|---|---|---|---|---|
| Rated Power | 4000W X 2 | 5000W X 2 | 5500W X 2 | 6000W X 2 |
| Maximum PV Input Current | 18A X 2 | 27A X 2 (Max 40A) | ||
| Power Limitation | Graph showing power output vs. MPPT temperature. | |||
MPPT Charger:
| Parameter | 8KW DC48V | 10-12KW DC48V |
|---|---|---|
| Solar charging current | 120Amax | 150Amax |
| Max. PV Array Open Circuit Voltage | 500Vdc max (single model) / 450Vdc max (parallel model) | |
| PV Array MPPT Voltage Range | 90~450Vdc (single model) / 90~430Vdc (parallel model) | |
| Min battery voltage for PV charge | 34Vdc | |
Joint Utility and Solar Charging:
| INVERTER MODEL | 8KW DC48V | 10KW DC48V | 11KW DC48V | 12KW DC48V |
|---|---|---|---|---|
| Max Charging Current | 120A | 150A | ||
| Default Charging Current | 80A | |||
5.4 Table 4 General Specifications
| INVERTER MODEL | 8KW DC48V | 10KW DC48V | 11KW DC48V | 12KW DC48V |
|---|---|---|---|---|
| Safety Certification | CE | |||
| Operating Temperature Range | -10°C to 50°C (>30°C de-rating, 1%/°C) | |||
| Storage temperature | -15°C ~ 60°C | |||
| Dimension (D*W*H), mm | 425*527*145 | |||
| Net Weight, kg | 18 | 18.1 | ||
6. Troubleshooting
This section provides guidance for common issues and their solutions. If problems persist after following these steps, contact customer support.
| 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. Battery polarity is connected reversed. Input protector is tripped. | 1. Check if batteries the wiring are connected and well. 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. (Appliance=>wide) | |
| 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 | Internal temperature of inverter component is over 90°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. The battery voltage is too high. | Return to repair center. Check if spec and quantity of batteries are meet requirements. | |
| Fault code 01 | Fan fault | Replace the fan. | |
| Fault code 06/58 | Output abnormal (Inverter voltage below than 202Vac or is higher than 253Vac) | 1. Reduce the connected load. 2. Return to repair center. | |
| Fault code 08/09/53/57 | Internal components filed. | Return to repair center. | |
| Fault code 51 | Over current or surge | Restart the unit, if the error happens again, please return to repair center. | |
| Fault code 52 | Bus voltage is too low | ||
| Fault code 55 | Output voltage is unbalanced | ||
| Fault code 56 | Battery is not connected well or fuse is burnt. | If the battery is connected well, please return to repair center. |
7. User Tips
- Battery Requirement: This product is an inverter/charger and does NOT include a battery. It requires an external 48V battery system (e.g., 200Ah for 8KW-10KW models, 250Ah for 11KW-12KW models) for operation. Ensure you have the correct battery type and capacity for your model.
- Monitoring: Utilize the PC software or the mobile app (optional Wi-Fi plug required) for comprehensive monitoring and configuration of your inverter. This allows you to track power generation, consumption, and adjust settings remotely.
- Installation Safety: Always ensure all wiring (AC, DC, PV) is performed by qualified personnel following local regulations. Double-check polarity and secure all connections to prevent damage or injury.
- Appliance Compatibility: Be aware of the startup requirements for certain appliances, like air conditioners, which may need a time-delay function to prevent damage during power fluctuations.
8. Warranty and Support
8.1 Warranty Policy
The warranty period for this inverter is one year, effective from the date you receive the goods. Within this one-year period, for damages not caused by human factors, engineers will diagnose the problem free of charge, provide repair solutions, and offer free accessories. Please note that improper operation, such as not following standard installation procedures when connecting cables, may void the warranty. Always read the manual carefully during installation.
8.2 After-Sales Support
For any other problems, you can directly contact customer support online. For technical issues, you can reach out to the engineers directly. Support is available 24 hours online.
- Engineer Phone: +86 17788797642 (WeChat and WhatsApp available)
- E-mail: cs-zjs@mustpower.cn
A Guarantee Certificate is provided with the product for your records. Please fill in the details upon purchase.
For the full Guarantee Certificate template, please refer to page 32 of the original PDF user manual.
9. Additional Resources
A detailed user manual in PDF format is available for download. This PDF contains comprehensive information including all LCD setting programs and detailed diagrams.
PDF User Manual: View User Manual (PDF)
Software Download: For monitoring software, visit https://sw.mustpower.com