I have a 1000 Ah battery bank and have connected a Victron Multi Compact 12V/2000VA/80 Amp. On the battery poles I get between 50-100 V AC,
When disconnecting everything on the AC side, the AC on DC side dissapears, but hanging a loose 30 meter electric wire to the AC side of the system (wire only, no load), I get 50 V AC. With 300W load, I get about 100 volts.
Wires are 35 mm2 and the device is properly grounded.
1: Any idea what is wrong?
2: Will this dammage my batteries?
Hoping for answer :-)