I have two 110 lines feeding my breaker panel that I have isolated so that one line feeds all the breakers I want on the inverter and the other line feeds all the things I don't want such as water heater air conditioning electric fireplace .. one line bypasses the multiplus and goes straight to the breaker that I don't want running off the batteries the other line runs through the multiplus and into the panel to the breaker I do want running off batteries .. the neutral from the shore plug goes both to the panel and to the multiplus .. the neutral that comes back out of the multiplus goes to the same neutral that feeds the panel so that really all the neutrals are connected together any place they're convenient to be connected ... I was instructed to run from the chassis ground on the multiplus to a chassis ground on the RV using the same size wire as is coming out of my battery Bank because when the shore power is disconnected the multiplus switches the neutral to the chassis ground and it must be beefed up to accommodate the full load of the system ... this information came straight from tech support and it makes sense to me but I'm throwing it out here in case one of you guys thinks it's insane and Will blow me to the Moon