1. Introduction
1.1 Purpose
This manual provides detailed instructions for the assembly, installation, operation, and troubleshooting of the InfiniSolar PREM800-6248 Hybrid Solar Inverter. Please read it carefully before installation and operation, and keep it for future reference.
1.2 Features
- Pure sine wave output
- 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
- Built-in Wi-Fi module and antenna
- BMS communication
- Dual AC output
1.3 Basic System Architecture
The inverter combines functions of an inverter, solar charger, and battery charger to provide uninterruptible power support. A complete system typically includes the inverter, a generator or utility power source, and optional PV modules. This inverter is designed to power various home and office appliances, including motor-type appliances like refrigerators and air conditioners.
2. Product Overview
The InfiniSolar PREM800-6248 inverter features a comprehensive LCD display and various ports for connectivity and monitoring.
2.1 Front Panel Components
- LCD Display: Shows operating status and power information.
- Status Indicator: LED indicating the inverter's current status.
- Discharging/Charging Indicator: LED showing battery charging or discharging activity.
- Fault Indicator: LED to signal system faults.
- Function Buttons: For navigating menus and adjusting settings.
2.2 Rear/Side Panel Components
- Power On/Off Switch: Main power control.
- AC Input: Connection for utility or generator AC power.
- AC Output: Connections for main and second loads.
- PV Input: Connections for solar panels.
- Battery Input: Connections for the battery bank.
- RS-485/CAN Communication Port: For communication with monitoring clients or lithium batteries.
- USB Port: For PC monitoring.
- External Wi-Fi Antenna: For wireless monitoring.
- Dry Contact: For external signal triggering.
- Ground: System grounding point.
3. Installation
3.1 Unpacking and Inspection
Before installation, carefully inspect the unit for any damage. The package should contain one inverter unit and one user manual.
3.2 Preparation and Mounting
Before connecting any wiring, remove the bottom cover by unscrewing the two screws. Select a solid, non-flammable surface for mounting. Install the inverter at eye level for easy LCD display reading. Ensure adequate air circulation with at least 200mm clearance on the sides and 300mm above and below the unit for heat dissipation. The ambient temperature should be between -10°C and 50°C.
3.3 Battery Connection
CAUTION: Only use deep-cycle lead-acid rechargeable batteries to reduce the risk of injury. All wiring must be performed by qualified personnel. Install a separate DC over-current protector or disconnect device between the battery and inverter. Ensure correct polarity (DC+ to DC+, DC- to DC-). Do not apply anti-oxidant substances to terminals before connecting. Never charge a frozen battery.
Recommended Battery Cable and Terminal Size:
| Model | Typical Amperage | Battery Capacity | Wire Size |
|---|---|---|---|
| 3624 DC24V | 135A | 100AH | 1*4AWG |
| 200AH | 2*6AWG | ||
| 4024 DC24V | 150A | 100AH | 2*4AWG |
| 200AH | 2*4AWG | ||
| 6248 DC48V | 135A | 100AH | 1*4AWG |
| 200AH | 2*6AWG |
For the 6248 model, it is suggested to connect at least a 200Ah capacity battery.
3.4 AC Input/Output Connection
CAUTION: Install a separate AC breaker between the inverter and the AC input source. Ensure correct polarity for AC wires. Do NOT misconnect input and output connectors. Never cause AC output and DC input short circuits. Do NOT connect to the mains when DC input short circuits.
Suggested Cable Requirement for AC Wires:
| Model | Gauge | Torque Value |
|---|---|---|
| 3624/4024 | 12AWG | 1.2~1.6Nm |
| 6248 | 8AWG | 1.4~1.6Nm |
For AC input, connect Ground (yellow-green), LINE (brown or black), and Neutral (blue). For AC output, connect Ground (yellow-green), L1 (brown or black), L2 (brown or black), and Neutral (blue).
3.5 PV Connection
CAUTION: Install a separate DC circuit breaker between the inverter and PV modules. All wiring must be performed by qualified personnel. Ensure correct polarity for PV modules. The open circuit voltage (Voc) of PV modules must not exceed the max. PV array open circuit voltage of the inverter (450Vdc for 6248). The Voc should also be higher than the min. battery voltage.
Suggested Cable Requirement for PV Wires:
| Model | Typical Amperage | Cable Size | Torque |
|---|---|---|---|
| 3624/4024 | 18A | 12AWG | 1.2~1.6Nm |
| 6248 | 28A | 10AWG |
Solar Charging Mode Specifications:
| INVERTER MODEL | MPPT charger | |
|---|---|---|
| 3624 / 4024 | 6248 | |
| Charging Current | 100A | |
| Max. PV Array Open Circuit Voltage | 400Vdc | 450Vdc |
| PV Array MPPT Voltage Range | 30~320Vdc | 60~360Vdc |
| System DC Voltage | 24Vdc | 48Vdc |
3.6 Final Assembly
After all wirings are connected, replace the bottom cover by screwing in the two screws.
4. Operation
4.1 Power ON/OFF
Once the unit is properly installed and batteries are connected, press the On/Off switch (located on the bottom of the case) to turn on the unit.
4.2 Operation and Display Panel
The front panel features an LCD display, three indicators (Status, Discharging/Charging, Fault), and four function keys (MENU, UP, DOWN, ENTER) for monitoring and configuration.
4.3 LCD Display Icons
The LCD display shows various icons to indicate input source information (AC/DC), output information (voltage, frequency, load), configuration programs, fault/warning codes, battery level, and operating modes (utility connected, PV connected, bypass, solar charging, DC/AC inverter circuit active).
4.4 LCD Settings
Press and hold the "ENTER" button for 2 seconds to enter setting mode. Use "UP" or "DOWN" to select programs and "ENTER" or "MENU" to confirm/exit. Key settings include:
- Output Source Priority: Configure whether solar energy, utility, or battery provides power as first priority.
- AC Input Voltage Range: Set acceptable voltage range for appliances or UPS.
- Output Voltage/Frequency: Adjust AC output voltage and frequency.
- Solar Supply Priority: Prioritize solar energy for charging or loads.
- Overload Bypass: Enable/disable transfer to line mode during overload.
- Auto Restart: Configure auto restart after overload or over temperature.
- Charger Source Priority: Define priority for solar and utility charging.
- Maximum Charging Current: Set limits for solar and utility charging currents.
- Battery Type: Select battery type (AGM, Flooded, GEL, Lithium, User-Defined).
- Charging Voltages: Adjust bulk and floating charging voltages.
- Low DC Cut-off/Warning: Set battery voltage thresholds for cut-off and warnings.
- Backlight Control: Adjust LCD backlight behavior.
- Alarm Control: Enable/disable alarms.
- Solar Power Balance: Adjust solar input power based on load.
- Battery Equalization: Configure battery equalization settings.
- BMS Communication: Settings for Battery Management System communication.
4.5 Operating Mode Description
The inverter operates in various states including Utility-Tie, Charge, Bypass, and Off-Grid, each with specific power flow logic and display indications. For example, in Utility-Tie state, PV energy charges the battery and utility provides power to AC loads. In Off-Grid state, the inverter provides power from battery and PV power to loads.
5. Specifications
5.1 Line Mode Specifications
| INVERTER MODEL | 3624/4024 DC24V | 6248 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(APL, UPS,GEN); 253Vac±7V(VDE) | |
| High Loss Return Voltage | 270Vac±7V(APL,UPS,GEN); 250Vac±7V(VDE) | |
| Max AC Input Voltage | 300Vac | |
| Nominal Input Frequency | 50Hz / 60Hz (Auto detection) | |
| Low Loss Frequency | 40Hz±1Hz(APL,UPS,GEN); 47.55Hz±0.05HZ(VDE) | |
| Low Loss Return Frequency | 42Hz±1Hz(APL,UPS,GEN); 47.55Hz±0.05HZ(VDE) | |
| High Loss Frequency | 65Hz±1Hz(APL,UPS,GEN); 51.5Hz±0.05HZ(VDE) | |
| High Loss Return Frequency | 63Hz±1Hz(APL,UPS,GEN); 50.05Hz±0.05Hz(VDE) | |
| Output Short Circuit Protection | Line mode: Circuit Breaker; Battery mode: Electronic Circuits | |
| Efficiency (Line Mode) | >95% (Rated R load, battery full charged) | |
| Transfer Time | 10ms typical (UPS,VDE); 20ms typical (APL) | |
5.2 Inverter Mode Specifications
| INVERTER MODEL | 3624 | 4024 | 6248 |
|---|---|---|---|
| Rated Output Power (Battery Mode) | 3000W | 3500W | 5500W |
| Rated Output Power (PV Input > 1000W) | 3600W | 4000W | 6200W |
| Output Voltage Waveform | Pure Sine Wave | ||
| Output Voltage Regulation | 230Vac±5% | ||
| Output Frequency | 60Hz or 50Hz | ||
| Peak Efficiency | 92% | ||
| Overload Protection | <1s@≥130%load; 10s@110%~130% load; 30s@105%~110% load | ||
| Nominal DC Input Voltage | 24Vdc | 48Vdc | |
| Cold Start Voltage | 23.0Vdc | 46.0Vdc | |
| Low DC Warning Voltage @load < 20% | 22.0Vdc | 44.0Vdc | |
| @ 20% ≤ load < 50% | 21.4Vdc | 42.8Vdc | |
| @load ≥ 50% | 20.2Vdc | 40.4Vdc | |
| Low DC Cut-off Voltage @load < 20% | 21.0Vdc | 42.0Vdc | |
| @ 20% ≤ load < 50% | 20.4Vdc | 40.8Vdc | |
| @load ≥ 50% | 19.2Vdc | 38.4Vdc | |
| High DC Recovery Voltage | 29Vdc | 58Vdc | |
| High DC Cut-off Voltage | 30Vdc | 60Vdc | |
5.3 Charge Mode Specifications
| Utility Charging Mode | |||
|---|---|---|---|
| INVERTER MODEL | 3624 | 4024 | 6248 |
| Charging Current @Nominal Input Voltage | 60A(±4A) | 100A(±4A) | |
| Floating charging voltage (AGM / Gel/LEAD Battery) | 27.4Vdc | 54.8Vdc | |
| Floating charging voltage (Flooded Battery) | 27.4Vdc | 54.8Vdc | |
| Bulk charging voltage (C.V voltage) (AGM / Gel/LEAD Battery) | 28.8Vdc | 57.6Vdc | |
| Bulk charging voltage (C.V voltage) (Flooded Battery) | 28.4Vdc | 56.8Vdc | |
| Charging Algorithm | 3-Step(Flooded Battery, AGM/Gel Battery), 4-Step(LI) | ||
| Solar Charging Mode | |||
| INVERTER MODEL | 3624 | 4024 | 6248 |
| Charging Current | MPPT-100A (±4A) | MPPT-100A (±4A) | |
| System DC Voltage | 24Vdc | 48Vdc | |
| Normal Operating Voltage Range | 30-320Vdc | 60-360Vdc | |
| Max.PV Array Open Circuit Voltage | 400Vdc | 450Vdc | |
| Standby Power Consumption | 2W | ||
| PV Voltage Accuracy | +/-2.5V | ||
| Charging Algorithm | 3-Step(Flooded Battery, AGM/Gel Battery),4-Step(LI) | ||
5.4 General Specifications
| INVERTER MODEL | 3624 | 4024 | 6248 |
|---|---|---|---|
| Safety Certification | CE | ||
| Operating Temperature Range | -10°C to 50°C | ||
| Storage temperature | -15°C~60°C | ||
| Dimension (D*W*H), mm | 436x330x122 | ||
| Net Weight, kg | 7.8 | 8.0 | 9.0 |
6. Troubleshooting
This section provides solutions for common issues. For persistent errors, contact a qualified service center.
| Problem | Explanation/Possible Cause | What to Do |
|---|---|---|
| Unit shuts down automatically during startup process. | Battery voltage is too low (<1.91V/Cell). | 1. Re-charge battery. 2. Replace battery. |
| No response after power on. | 1. Battery voltage is far too low (<1.4V/Cell). 2. Battery polarity is connection reversed. | 1. Check if batteries and wires are connected properly. 2. Re-charge battery. 3. Replace battery. |
| Mains exist but the unit works in battery mode. | Input protector is tripped. | Check if AC breaker is tripped or AC wiring is connected right. |
| Insufficient quality of AC power (Shore or Generator). | 1. Check if AC wires are too thin and/or too long. 2. Check generator (if applied) is working well or check if input voltage range setting is correct. | |
| When the unit is turned on, internal relay is switched on and off repeatedly. | Battery is disconnected. | Check if battery wires are connected right. |
| 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 right 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. | Return to repair center. |
| Buzzer beeps continuously and red LED is on. | The battery voltage is too high. | Check if spec and quantity of batteries meet requirements. |
| AC input L/N wires are reversed. | Check AC input. | |
| Fan fault. | Replace the fan. | |
| Output abnormal. (Inverter voltage below 95Vac or higher than 150Vac). | 1. Reduce the connected load. 2. Return to repair center. | |
| Internal components failed. | Return to repair center. | |
| Over current or surge. | Reduce the connected load. | |
| Inverter bus voltage is too low or component temperature is too high. | Restart the unit, if the error happens again, please return to repair center. | |
| Output voltage is unbalanced. | ||
| Battery is not connected right or fuse is burnt. | If the battery is connected well, please return to repair center. |
7. Wi-Fi Quick Installation Guideline
The inverter includes a built-in Wi-Fi module for remote monitoring via a mobile app or PC web interface. Ensure the datalogger is connected and powered on.
7.1 Login and Register
Download the official app (available on Google Play and App Store). Open the app and click "Sign up" to register using your phone number or email. After registration, log in with your credentials.
7.2 Add Devices
After logging in, click "Add Device" or the "+" button on the monitoring page. You can add devices via Bluetooth (if supported) or by scanning the QR code on the datalogger.
7.3 Networking Configuration
If your device is a Wi-Fi module, the network configuration page will appear. Select your router, enter the password, and click "Start networking." Ensure a good network signal and use a 2.4G band router. If configuration fails, refer to the app's diagnosis results for troubleshooting.
8. User Tips
- Voltage and Phase Compatibility: This inverter is designed for 230V single-phase systems. Ensure your home appliances and grid connection are compatible with this voltage and phase configuration. It is not suitable for 120V split-phase or 380V three-phase systems.
- Battery Capacity: For optimal performance with the 6248 model, it is recommended to use a battery with at least 200Ah capacity.
- Appliance Sizing: When connecting appliances, especially motor-driven ones (inductive loads), ensure the inverter's rated power is 1.5 to 3 times the appliance's power to handle surge currents. For capacitive/resistive loads, a 1 to 1.5 times margin is recommended.
9. Warranty and Support
9.1 Warranty Information
All InfiniSolar products come with a 1-year warranty from the date of purchase. The warranty period for the machine is 1 year, and for the battery is 1 year. The warranty does not cover:
- Damage due to bad transportation, loading, unloading, and storage.
- Maintenance, refitting, or setup without authorization.
- Over-voltage and overload.
- Damages by force majeure or misuse.
Please retain your warranty registration card for maintenance services.
9.2 Technical Support
Our dedicated support team guarantees a resolution within 24 hours for any quality issues. If repairs require replacement parts (motherboards, displays, control panels, Wi-Fi modules, etc.), they will be shipped free of charge. Customers may also ship their unit (at their expense) to a local MUST service center for professional repair.
For help with PV panel configuration, battery integration, or product troubleshooting, expert engineers are available 24/7 via phone or WhatsApp at +86 17788797642.
Beyond the warranty period, genuine parts are supplied at competitive prices to ensure your system remains operational.
For additional guides and documents, including a PDF user manual, please refer to the official website or scan the QR code provided in the original manual: User manual (PDF)
