FoxESS
Error 26
Grid Voltage Out of Range
AC grid voltage is outside the permitted window (typically 207–253 V for G98/G99). Inverter will disconnect until voltage recovers.
Common causes
High grid voltage (voltage rise from local export)Low grid voltage (weak supply or long cable run)Loose AC terminal connection causing voltage drop
What to check
STEP 1
Measure the AC voltage at inverter terminals with a multimeter. Compare to G98 limits
STEP 2
If voltage is high due to export, check Active Power Control settings in Fox ESS app. Reduce export limit or enable reactive power control
Escalate if
Voltage is persistently out of range and DNO intervention is needed, or fault persists with voltage in range
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