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Late to the party but I bought a used Solaredge 3800 (2021 serial number, no storage) on ebay that was claimed to be working but also suffers from 3x9B rapid shutdown test failure on startup. I looked up what this failure is and it's triggered when the measured dc bus voltage is greater than...

This was an amazing thread to read. I think this DIY installation went quicker from start to PTO than my professional Freedom Forever install. Like the OP, I picked up a used Solaredge system that was taken down off someone's house before the house was torn down. I didn't get quite as good a...