What to do if my SOLIS 4G Inverter displays UN-BUS: DC BUS voltage is too low?
If your SOLIS Inverter displays 'UN-BUS: DC BUS voltage is too low', it means the inverter detects a low DC voltage on the internal bus. Measure both DC and AC voltages and compare them with the LCD readings. The inverter may need to be replaced due to internal damage or a wire that came loose during shipping.
What to do if my SOLIS 4G displays OV-BUS: DC BUS voltage is too high?
If your SOLIS Inverter displays 'OV-BUS: DC BUS voltage is too high', it means the inverter detects a high DC voltage on the internal bus. Measure both DC and AC voltages and compare them with the LCD readings. The inverter may need to be replaced due to internal damage or a wire that came loose during shipping.
Why is my SOLIS 4G stuck in initializing mode?
If your SOLIS Inverter is stuck in 'Initializing' mode, it could be waiting for a driving signal. To resolve this, test with the DC switch OFF by checking the PV connections, polarity, and ensuring the voltage is greater than 120V for single-phase or greater than 350V for three-phase systems. Then, test with the DC Switch ON, again checking the voltage. A cable may have been damaged or loosened during shipping, which might require replacing the inverter.
How to troubleshoot a SOLIS Inverter with no information (blank screen)?
If your SOLIS Inverter shows no information or a blank screen, it could be due to several reasons: low or missing input voltage, reversed polarity, or a damaged main board. To troubleshoot, first test with the DC switch OFF by checking PV connections, polarity, and ensuring the voltage is greater than 120V for single-phase or greater than 350V for three-phase systems. Then, test with the DC Switch ON, again checking the voltage. If the DC voltage is “0”, the inverter may need to be replaced.
Why does my SOLIS 4G say NO-GRID?
If your SOLIS Inverter is showing 'NO-GRID', it means the inverter is not detecting the grid. With the DC switch OFF, check the AC voltage at the inverter test points (L-L, L-GND). Check the LCD reading, as it may indicate a bad measurement circuit. With the DC Switch ON, check the grid standard. If problems persist, the inverter may need replacement.
What does it mean when my SOLIS Inverter displays GRID-INTF: Grid unstable?
If your SOLIS Inverter displays 'GRID-INTF: Grid unstable', it means the inverter detects grid instability and a high internal fault current. With the DC Switch OFF, measure the AC voltage and test the AC line for THD. With the DC Switch ON, test the AC line for THD again. If you have multiple inverters, try turning one off. You may need an impedance matching adjustment or box. Internal damage or a loose wire in shipping could also be the cause.
What to do if SOLIS 4G Inverter screen is OFF with DC applied?
If your SOLIS Inverter screen is OFF while DC is applied, it means the inverter is internally damaged. Do not turn off the DC switches, as it will damage the inverter. Wait for the solar irradiance to reduce and confirm the string current is less than 0.5A with a clip-on ammeter before turning off the DC switches. Note that any damages due to wrong operations are not covered in the device warranty.
What should I do if my SOLIS 4G Inverter shows ARC-FAULT?
If your SOLIS Inverter displays 'ARC-FAULT', it indicates that the inverter has detected an arc in the DC circuit. Inspect the installation, check the cable with a string tester, and physically check the cables. Also, inspect the panel junction boxes and cable connections. Try resetting the inverter. If the problem persists, consider replacing the inverter.
What to do if my SOLIS 4G Inverter displays OV-TEM: Temperature Protection?
If your SOLIS Inverter displays 'OV-TEM: Temperature Protection', it means the inverter detects a high ambient temperature, specifically above 60C. Inspect the installation, checking the heatsink for any obstructions and ensuring adequate ventilation. Verify that the inverter is not in direct sunshine and measure the ambient temperature near the inverter. If the temperature is within range, the inverter may need to be replaced.
What does it mean if my SOLIS Inverter shows UN-G-F: Under Grid Frequency?
If your SOLIS Inverter displays 'UN-G-F: Under Grid Frequency', it means the inverter is detecting that the grid frequency is too low. With the DC switch OFF, check the frequency at the inverter test points. If the frequency measures low, adjust the lower limit with permission from the utility and check the LCD reading, as it may be a bad measurement circuit. With the DC Switch ON, verify the appropriate Grid Standard. If the issue continues, the inverter may need to be replaced.
General| Frequency | 50Hz / 60Hz |
|---|---|
| Output Power Range | 3.0kW - 6.0kW |
| AC Output Voltage | 230V |
| Communication | RS485 |
| Cooling | Natural Cooling |
| Operating Temperature Range | -25°C ~ +60°C |
| Protection | IP65 |
Explains hazard warning symbols used throughout the manual for safety awareness.
Crucial safety guidelines for operating and installing the inverter to prevent hazards.
Criteria for choosing an optimal and safe installation site for the inverter.
Instructions and clearance requirements for physically mounting the inverter securely.
Procedures for connecting the solar panel DC input, including polarity and voltage checks.
Guidelines for connecting the inverter to the AC grid, specifying voltage and phase.
Step-by-step guide to safely start up the inverter according to sequence.
Step-by-step guide to safely shut down the inverter in the correct order.
Guide to identifying and resolving common inverter alarms and operational issues.
Detailed technical specifications for the 2.5kW Solis 4G series inverter.
Detailed technical specifications for the 3.6kW Solis 4G series inverter.
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