This is an advanced configuration ... but my RV is split-phase (2 Quattro 5k's) configured such that I can still connect to 120v shore ("switch as group" is turned off) using a typical RV dog-bone adapter. While that presents 120v to both L1 and L2, it's the same "phase" so the L2 Victron ignores the input. However, I always immediately trip the shore's GFCI in the outlet (multiple campgrounds now) as soon as the L1 Quattro connects to shore... from what I understand, that means that there's a difference in the current between hot and neutral. And I'm not sure how that's possible. One quattro (L1) is configured to bond neutral-ground when disconnected from shore. Would appreciate thoughts on how to diagnose, given the immediate tripping that occurs and the probable tiny difference in current between hot and neutral (such that attempting to measure for where leakage is occurring would seem impossible). Note that I do have a 240v load (mini-split) ... I'm trying to wrap my head around the current flow in that case .. since L1 is coming from shore and L2 is coming from the inverter. Neutral is not used by the mini-split (not sure if it's physically connected, however).