Customer brought in his RV that he wired him self. He has the 50 amp shore chord wired directly to Inverters. L1 and L2 split to each inverter. neutral and ground are shared in a junction box.
The output of the inverters are wired to the automatic transfer switch again with Neutral and grounds shared from each leg. Never saw a system wired this way and his automatic transfer switch is constantly trying to latch.
Inverters are programmed for split phase 180 with returning. So that part seems correct.