I have a 230v MP2 feeding an auto transformer for 120/240v split phase to the panel. It is currently connected to the hot legs of 120/240 shore power, shore neutral not connected to anything.
I have a 3200w iso transformer on the way to step up 120v shore power and remove the incoming neutral-ground bond.
In either of the above scenarios I do not take on the shore neutral. Am I correct that I need a N-G bond after the AT 100% of the time, not just when the MP2 is inverting and activates the relay?
I noticed that after the AT my legs have different voltages, ~120 and ~126. L1-G reads ~3v higher voltage than L1-N as expected, however L2-N is ~3v higher than L2-G. N-G is ~3v.
Edit to add: As I am passing through shore power with the inverter in charge only mode the internal ground-neutral relay is not functioning. When my ve bus to usb adapter arrives I will disable the relay entirely if my solution of a hardwired bond is acceptable.
To experiment I created a N-G bond with a jumper at the AT output. Now L1-N = L1-G and L2-N = L2-G. N-G = a few mV with the jumper in place. However L2 still 6v higher than L1. Is this normal?
Anyone see any safety issues here? I can not think of any situation where I would not want N-G bonded on board with this setup.