Enphase › battery pack
Battery plateaus below 100%, poor round-trip efficiency
reported in the field
Symptoms
- Charging stalls in the 75-94% range instead of reaching 100%, or a system that should hold roughly 90% round-trip efficiency shows closer to 50%, with the shortfall exported to the grid instead of stored
- One report traces the deficit to the system silently counting a nonexistent extra battery module in its capacity total
- Owners report the pattern gets worse in cold weather or heat waves
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.