EG4 › battery communication port
Inverter drops output every 10-15 minutes, Warning 27
reported in the field
Symptoms
- Every 10-15 minutes the inverter drops AC output for a few minutes and displays Warning 27, occasionally tripping the battery breaker
- A FlexBOSS21/GridBOSS system with Wall Mount batteries produces several 1-2 second power blips a day, in one case starting after a firmware update
- And a FlexBOSS system shuts down at the low-SOC cutoff with W000 (battery comm failed), W026 (battery under voltage) and W027 (battery open circuit) together, needing a manual reset to recover
Alerts and codes
Warning 27W000W026W027Error (27)Error (17)
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.