How do I fix Grid Over-Voltage on a Solis?

Measure grid voltage at inverter AC terminals with multimeter. UK nominal 230V — if consistently above 253V, this is a DNO issue Then: Check AC cable sizing and length. Voltage rise on long runs — resize cable if needed. Log voltage and time to report to DNO

Solis

E001

Grid Over-Voltage

Grid voltage has exceeded upper limit. Inverter disconnects to protect equipment.

Common causes

DNO voltage too high at point of connectionLong AC cable run causing voltage riseGrid voltage fluctuation

What to check

STEP 1

Measure grid voltage at inverter AC terminals with multimeter. UK nominal 230V — if consistently above 253V, this is a DNO issue

STEP 2

Check AC cable sizing and length. Voltage rise on long runs — resize cable if needed. Log voltage and time to report to DNO

Escalate if

Voltage within spec but fault persists, or voltage consistently above 253V — report to DNO and contact Solis support

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