Isolation fault on solar inverter | PV Isolation Low | ERROR State 475 Ground fault

Hello to all the people who have an Isolation Fault on their solar inverter. You have found this video because unfortunately you woke up one day to either hearing an alarm sound on your solar inverter, or having a PV Isolation Low message appear on the inverter.
queenslandsolarandlighting.co...
This error message means the same thing, however different solar inverter manufacturers call it something different.
Fronius Primo and Symo Inverters: ERROR State 475
Growatt Inverters: PV Isolation Low
A various tropical blend of Chinese Inverters: Isolation Fault

[@tomlong5130]

I have an isolation fault ONLY in the early morning when production starts. it is with NEW quality panels. BUT after some minutes the inverter (Solax) starts. So it last 5-20 minutes then it starts. When i switch off the inverter and start again, no iso-fault anymore. Also during the day when it is raining very hard, i have no iso-fault! Any clue except one panel has a fault?!?

[@setepele6804]

best video on the topic, thanks from brazil!

[@QueenslandSolar]

Glad it was helpful!

[@ErrandBoyAbroad]

Had the fault on an eversolar readout stating 'Isolation Fault'.... Changed over the inverter to another working same model eversolar, and the fault was then non existent on the changed over inverter. The faulty inverter was intermittently coming good at any stage after some hours of being connected, and, inturn, going faulty when it felt like it. It appeared that the panels were not fau;lty, but the inverter was obviously faulty.