I have dual Victron Quattro 3000W 24V 2x120 inverters running in parallel to power my RV. (Solar on the roof, lithium batteries, etc.) They have worked fine up until a recent firmware update. After upgrading the inverters from 552 to 556 firmware, they will not connect to shore power. I keep getting L1 Overload fault. When disconnecting the shore cord, I got shocked. I tested it with my meter and I am getting 120V from GND to L1,L2, and N. I don’t think this should be happening. It’s like my inverters are trying to backfeed the grid, which they shouldn’t be. I have tried rolling back firmware, soft reset, hard reset, I’ve checked all settings. No ideas what to try next.
when updating firmware all settings are cleared. reach out to your dealer for help getting setup restored for parallel operation.
this is not recommended for a DIY to undertake