You should be able to figure this out by yourself with a minimum of detective work.
A breaker only opens when the current through it exceeds the breaker rating.
A big clue as to why this is happening is because when you power up the inverter it needs about 60 amps of current. Even if you have no AC loads connected to it, it may need to charge some grunty(ish) input stage caps so have a large inrush current at power on time.
So does it look likely that a large proportion or maybe all of this possible 60 amps is trying to flow through the breaker?
All wires/cables to everything nice and tight? inc battery interconnects?
Is the inverter connected direct to the battery bank via its own 80 to 120 amp breaker?
If not why not?
Please let us know how you resolved this problem
« Last Edit: March 20, 2017, 07:23:52 PM by dgd »
Classic 250, 150, 20 140w, 6 250w PVs, 2Kw turbine, MN ac Clipper, Epanel/MNdc, Trace SW3024E (1997), Century 1050Ah 24V FLA (1999). Arduino power monitoring and web server. Off grid since 4/2000
West Auckland, New Zealand