1. Alarm Codes and issues for Solis 1P(1-6)K-4G-US and Solis-(6-10)K-4G-US Single Phase
| No Information (Blank Screen) | • Input voltage low/missing • Polarity reversed • Main board damaged | Test – DC switch OFF • Check PV connections • Check polarity • Check voltage >120V Single, >350V three Test – DC Switch ON • Check voltage >120V Single, >350V three • If DC voltage is “0” replace inverter If voltages are all normal but inverter won't turn on - RMA |
| Initializing (Inverter stuck in this mode) | • Inverter is waiting for driving signal | Test – DC switch OFF • Check PV connections • Check polarity • Check voltage >120V Single, >350V three Test – DC Switch ON • Check voltage >120V Single, >350V three • A cable may have been damaged or loosened in shipping replace inverter |
| OV-G-V: Over Grid Voltage | • Inverter detects grid voltage as too high | Test – DC switch OFF • Check AC at the inverter • If AC measures high, adjust upper limit with permission from utility Test – DC Switch ON, full power • Check AC at inverter test points • Compare with LCD • If AC measures high, cables between inverter and interconnect are too small • Check ampacity and voltage drop calculations |
| UN-G-V: Under Grid Voltage | • Inverter detects grid voltage as too low | Test – DC switch OFF • Check AC at the inverter test points • If AC measures low, adjust lower limit with permission from utility • Check LCD voltage reading, may be a bad measurement circuit Test – DC Switch ON • Check grid standard • Replace inverter |
| OV-G-F: Over Grid Frequency | • Inverter detects grid Frequency as too high | Test – DC switch OFF • Check frequency at the inverter test points • If Frequency measures high, adjust upper limit with permission from utility • Check LCD reading, may be a bad measurement circuit Test – DC Switch ON • Check grid standard • Replace inverter |
| NO-GRID | • Inverter does not detect the grid | Test – DC switch OFF • Check AC at the inverter test points • L-L, L-GND • Do NOT tell me 240VAC • Check LCD reading, may be a bad measurement circuit Test – DC Switch ON • Check grid standard • Replace inverter |
| OV-DC: DC voltage is too high | • Inverter detects High DCV | Test – DC switch OFF • Check DC at the inverter test points • If DCV is high, too many panels in the string Test – DC Switch ON • Check LCD reading, may be a bad measurement circuit • Replace inverter |
| OV-BUS: DC BUS voltage is too high | • Inverter detects High DCV on internal bus | Test • Measure DC and AC voltages • Compare with LCD • Replace inverter • Internal damage • Wire came loose during shipping |
| UN-BUS: DC BUS voltage is too low | • Inverter detects low DCV on internal bus | Test • Measure DC and AC voltages • Compare with LCD • Replace inverter • Internal damage • Wire came loose during shipping |
| GRID-INTF: Grid unstable | • Inverter detects grid instability, internal fault current high | Test – With DC Switch OFF • Measure AC voltage • Test AC line for THD • Test – With DC Switch ON Test AC line for THD • Multiple inverters/turn one off • Impedance matching adjustment or box • Internal damage • Wire came loose in shipping |
| INI-FAULT: Initialization Protection | • Master and Slave DSP have different values | Reset Inverter • DC switch OFF • Wait until all lights/LCD turn off • DC switch ON • Replace inverter |
| OV-TEM: Temperature Protection | • Inverter detects high ambient temperature >60C | Inspect installation • Check heatsink for obstructions/ventilation • Is inverter in direct sunshine • Measure ambient temperature near inverter • If temp is in range replace inverter |
| PV ISO-PRO 01/02: Ground Protection | • Inverter detects low DC insulation resistance | Inspect installation • Reset inverter • Note weather conditions when alarm occurs • Measure insulation resistance • If normal, measure in SAME weather as alarm • Physically check cables • Replace inverter |
| AFCI Check FAULT | • AFCI module self check fault | Reset Inverter • DC switch OFF • Wait until all lights/ LCD turn off • DC switch ON • Replace inverter |
| ARC-FAULT | • Inverter detects arc in DC circuit | Inspect installation • Physically check cables • Inspect panel junction boxes • Inspect cable connections • Reset inverter • Replace inverter |
| IG-AD | • Grid current sampling fault | • Fault caused by internal component failure --> Automatic RMA. |
2. Alarm Codes and Issues for Solis-(1-5)K-2G-US Single Phase
| OV-G-V | OVER GRID VOLTAGE | |
| UN-G-V | UNDER GRID VOLTAGE | |
| OV-G-F | OVER GRID FREQUENCY | |
| UN-G-F | UNDER GRID FREQUENCY | |
| G-IMP | HIGH GRID IMPEDANCE | |
| NO-GRID | NO GRID VOLTAGE | |
| OV-DC | OVER DC VOLTAGE | |
| OV-BUS | OVER DC BUS VOLTAGE | |
| UN-BUS | UNDER DC BUS VOLTAGE | |
| GRID-INTF | GRID INTERFERENCE | |
| INI-FAULT | INITIALIZATION SYSTEM FAULT | |
| OV-TEM | OVER TEMPERATURE | |
| GROUND-FAULT | GROUND FAULT | |
| ILEAK-FAULT | HIGH GRID LEAKAGE CURRENT | |
| RELAY-FAULT | RELAY CHECK FAULT | |
| DCINJ-FAULT | High DC injection current | |
| AFCI CHECK FAULT | AFCI Module self-check fault | |
| ARC-FAULT | Arc detected in DC current | |
| AC/DC unresponsive | DC input shorted out | RMA |
3. Alarm Codes and Issues for Solis Energy Storage (Hybrid) 5-10 kW Single Phase
| Alarm Code or Issue | Failure Description | Solution |
| OV-G-V | Grid Overvoltage | 1. Check if the grid is correctly connected 2. Check if the AC voltage is normal on the LCD 3. Match displayed voltage with voltage measured at the AC terminals in the inverter 4. If voltages do not match - RMA |
| UN-G-V | Grid Undervoltage | 1. Check if the grid is correctly connected 2. Check if the AC voltage is normal |
| OV-G-F | Grid Overfrequency | 1. Check if the grid is correctly connected 2. Check if the AC voltage is normal |
| UN-G-F | Grid Underfrequency | 1. Check if the grid is correctly connected 2. Check if the AC voltage is normal |
| NO-Grid | No Grid | 1. Check if the grid is correctly connected 2. Check if the AC voltage is normal |
| OV-BUS | DC Bus overvoltage | Restart the inverter |
| UN-BUS | DC Bus voltage sampling Error | Restart the inverter |
| DC-INTF. | Battery Overcurrent | Restart the inverter |
| IGFOL-F | Grid Current Tracking Error | Restart the inverter |
| OV-G-I | Grid Overcurrent | Restart the inverter |
| AC Transient over current | AC Transient Overcurrent | Check if the backup port is shorted, restart the inverter |
| DCInj-FAULT | Over DC injection | Restart the inverter |
| LimByVg | Limited by grid voltage | If Rule 21 is unnecessary, then set working mode to "NULL" but if Rule 21 is required, know that this code is designed to protect the inverter and is normal but if the code is given for long periods of time then it could mean there is an issue with the inverter or grid. |
| IGBT-OV-I | IGBT Overcurrent | Restart the inverter |
| OV-TEM | Internal Over Temperature | Check if the inverter installation meets the requirements listed in the manual, restart the inverter |
| RelayChk-FAIL | Relay Fault | Restart the inverter |
| GRID-INTF02 | Grid Interference 02 | Restart the inverter |
| IG-AD | Grid Current Sampling Error | Restart the inverter |
| OV-IgTr | Grid Transient Overcurrent | Restart the inverter |
| OV-Vbatt-H | Battery Hardware Overcurrent | Check if the battery is correctly connected or the battery contactor is disconnected, restart the battery, restart the inverter |
| OV-ILLC | LLC Hardware Overcurrent | Restart the inverter |
| OV-Vbatt | Battery Overvoltage | Check if the battery overvoltage setting is reasonable, if the battery reaches its end of life |
| UN-Vbatt | Battery Undervoltage | Check if the battery undervoltage setting is reasonable, if the battery reaches its end of life |
| DSP-B-FAULT | Slave DSP Check Error | Restart the inverter |
| NO-Battery | Battery Not Connected | Check if the battery is correctly connected or the battery contactor is disconnected, Restart the battery |
| OV-Vbackup | Inverting Overvoltage | Restart the inverter |
| Over-Load | Backup Overload | Check if the backup port is shorted or the load is larger than the limitation |
| Fail Safe | CT Cable Fail | Check if CT is correctly installed or the cables are broken/loosen |
| MET_Comm_FAIL | Meter COM Fail | Check if the CT/Meter setting is correct or the cables are broken/loosen |
| CAN_Comm_FAIL | Battery CAN Fail | Check if the CAN cable is correctly connected or the cables are broken/loosen |
| DSP_Comm_FAIL | DSP COM Fail | Restart the inverter |
| Alarm-BMS | Battery BMS Alarm | Retart the battery, if fault still exists, please contact battery manufacturer or installer |
| BatName-FAIL | Wrong Battery Model | Make sure the actual battery model matches the selection on inverter LCD |
| LG-DDC-OV | LG Battery overvoltage | Turn both battery breaker off and then on again. |
| LG-Comm-FAIL | LG Battery Com Fail | Check the RS485 cable of LG battery. Ensure it is correctly connected without broken insulation |
| LG-BMS-Fault | Restart the battery. If the fault still exists, contact the battery manufacturer or installer. |
3. Alarm Codes and Issues for Solis-(25-40)K-US, (50-66)K-US, (75-100)K-US, 125K-US, and (185-255)K-US Three Phase Inverters
| Alarm Message | Failure Description | Solution |
| No Power | Inverter No Power on LCD | 1. Check PV input connections 2. Check DC input voltage (single phase >120V, three phase >350V) 3. Check if PV+/- is reversed 4. If everything is normal, including voltages - RMA |
| LCD show initializing all the time | can not start-up | 1. Check if the connector on main board or power board are fixed. 2. Check if the DSP connector to power board are fixed. |
| LCD Blank | RMA | |
| OV-G-V | Over grid voltage | 1. Resistant of AC cable is too high. Change bigger size grid cable 2. Adjust the protection limit if it’s allowed by electrical company |
| UN-G-V | Under grid voltage | 1. Use user define function to adjust the protection limit if it’s allowed by electrical company. |
| OV-G-F | Over grid frequency | 1. Use user define function to adjust the protection limit if it’s allowed by electrical company. |
| UN-G-F | Under grid frequency | 1. Use user define function to adjust the protection limit if it’s allowed by electrical company. |
| G-IMP | High grid impedance | 1. Use user define function to adjust the protection limit if it’s allowed by electrical company. |
| No-Grid | No grid voltage | 1. Check connections and grid switch. 2. Check the grid voltage inside inverter terminal. |
| OV-DC | Over DC voltage | 1. Reduce the module number in series |
| OV-BUS | Over DC bus voltage | 1. Check inverter inductor connection 2. Check driver connection |
| UN-BUS | Under DC bus voltage | 1. Check inverter inductor connection 2. Check driver connection 3. If an MPPT has failed - RMA |
| GRID-INTF | Grid interference | 1. Restart inverter 2. Change power board |
| OV-TEM | Over Temperature | 1. Check inverter surrounding ventilation. 2. Check if there’s sunshine direct on inverter in hot weather. |
| INI-Fault | Initialization system fault | 1. Restart inverter or contact installer. |
| Ground-Fault | Ground fault | 1. Measure the insulation resistance and locate and check isolation of PV cable. 2. Change the main board if the resistance are higher than 1MΩ |
| ILeak-Fault | High Grid leakage current | 1. Check AC and DC connection 2. Check inverter inside cable connection. |
| Relay-Fault | Relay check fault | 1. Restart inverter or contact installer. |
| DCinj-Fault | High DC injection current | 1. Restart inverter or contact installer. |
| AFCI Check Fault | AFCI module self check fault | 1. Restart inverter or contact installer. |
| Arc Fault | ARC detected in DC circuit | 1. Check if there’s arc in PV connection and restart inverter. 2. If the arc fault is false - RMA |
| LimbyTemp | Temp Below 17C. Inv Could limit power to 50% | 1. Wait until internal temperature rises above 17C |
| DC-INTF | ||
| Stuck in Soft Run Mode | RMA | |
| Display voltages and meter voltages don't match | RMA |