SolarEdge › inverter power stage
Inverter reboots repeatedly logging an 18xB fault code
reported more than once
Symptoms
- Inverter fails outright or reboots repeatedly
- The local display or error log shows an 18xB-family code (e.g. 18xB7, 18xB5) or a community-quoted 'Vcap' surge message
- A replacement unit sometimes fails again with the same code shortly after install
- SolarEdge's own firmware update aimed at the fault is treated by owners as a stopgap rather than a fix
Alerts and codes
18x1C18xB518xB618xB718xB918xBA18xBC18xB Vcap21 Surge18xBE18xA518x1418xD6
The cause and the fix
Subscribers see the cause, the fixes that worked and who did them, part numbers and recent prices when a part is involved, and the field reports behind this entry.