[RE-wrenches] Sol-Ark 15KW is rock steady, but crazy wild grid voltages when connected to grid

[scot.arey at solarcentex.com]

I have Sol-Ark 15KW with 31kwh battery has been installed for year+.

 

Customer has for two days been having grid voltage issue seen as dimming
lights. No neighbors reporting issues. He called his electrician who noted
one high conductor and the other low. Have seen this before unrelated to
solar and it was a bad neutral. His electrician says ok.

Customer disconnects from the grid because the fluctuations so severe and
when he does, voltage issues go away and Sol-Ark is rock steady at 120-volts
per leg. I send my senior tech over to ensure we don't have a loose neutral
or any grid conductors to the grid input. Nothing found.

Picture attached of grid voltages from the Sol-Ark monitoring (very helpful,
I might add.)

The electric cooperative is sending a tech out tomorrow. Any body have
insight or history with this?

 

 



 

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