What does it mean if my SOLIS 4G displays UN-BUS: DC BUS voltage is too low?
If your SOLIS Inverter displays UN-BUS, it indicates that the inverter has detected a low DC voltage on the internal bus. To troubleshoot: * Measure the DC and AC voltages and compare them with the LCD readings. If the problem persists, the inverter may require replacement due to internal damage or a wire that came loose during shipping.
What to do if my SOLIS 4G Inverter displays INI-FAULT: Initialization Protection?
If your SOLIS Inverter displays an INI-FAULT error, it indicates an initialization protection issue, likely because the master and slave DSP have different values. To resolve this: * Reset the inverter by turning the DC switch OFF, waiting until all lights/LCD turn off, and then turning the DC switch ON. If the issue remains, the inverter may need to be replaced.
What to do if my SOLIS Inverter displays AFCI Check FAULT?
If your SOLIS Inverter displays an AFCI Check FAULT, it indicates a self-check fault in the AFCI module. To resolve this: * Reset the inverter by turning the DC switch OFF, waiting until all lights/LCD turn off, and then turning the DC switch ON. If the issue persists, the inverter may need to be replaced.
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 to do if my SOLIS Inverter shows a NO-GRID error?
If your SOLIS Inverter doesn't detect the grid, first, with the DC switch OFF, check the AC voltage at the inverter test points (L-L, L-GND). Ensure it's not 240VAC. Then, with the DC Switch ON, check the grid standard. If the issue persists, the inverter may need to be replaced.
What to do if my SOLIS 4G Inverter shows NO-GRID?
If your SOLIS Inverter displays a NO-GRID error, it means the inverter isn't detecting the grid. To troubleshoot: * With the DC switch OFF, check the AC voltage at the inverter test points (L-L, L-GND). * Verify the LCD reading to rule out a faulty measurement circuit. With the DC switch ON: * Check the grid standard. If the issue persists, the inverter may need to be replaced.
Why does my SOLIS 4G screen show no information (blank screen)?
A blank screen on your SOLIS Inverter could be due to several reasons: * Low or missing input voltage. * Reversed polarity. * A damaged main board. To troubleshoot: * Test with the DC switch OFF: Check PV connections, polarity, and voltage (>120V Single, >350V three). * Test with the DC switch ON: Check voltage (>120V Single, >350V three). If the DC voltage is "0", replace the inverter.
What to do if the screen of my SOLIS 4G is OFF with DC applied?
If the screen of your SOLIS Inverter is OFF even with DC power applied: * 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, and then turn off the DC switches. Note: Damages due to wrong operations are not covered in the device warranty.
What to do if my SOLIS 4G shows OV-G-V: Over Grid Voltage?
If your SOLIS Inverter displays 'OV-G-V: Over Grid Voltage', it means the inverter is detecting that the grid voltage is too high. First, with the DC switch OFF, check the AC voltage at the inverter. If it measures high, adjust the upper limit with permission from the utility. Then, with the DC Switch ON and at full power, check the AC at the inverter test points and compare with the LCD. If the AC measures high, the cables between the inverter and interconnect may be too small. Check the ampacity and voltage drop calculations and verify the appropriate Grid Standard.
What should I do if my SOLIS Inverter displays UN-G-V: Under Grid Voltage?
If your SOLIS Inverter displays 'UN-G-V: Under Grid Voltage', it means the inverter is detecting that the grid voltage is too low. With the DC switch OFF, check the AC voltage at the inverter test points. If the AC measures low, adjust the lower limit with permission from the utility and check the LCD voltage reading, as it may be a bad measurement circuit. With the DC Switch ON, verify the appropriate Grid Standard. If the issue persists, 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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