Tesla Powerwall › gateway control board and firmware
Backup reserve set above 80% reverts to 80%
reported in the field
Symptoms
- Any reserve set 81 to 99% silently reverts to 80% in self-powered and time-based modes
- API reports Max Backup Reserve 80%
- Still present on firmware 26.2.2 in March 2026
Alerts and codes
Max Backup Reserve: 80%
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.