sounds like your surge guard or power management is kicking off so then the inverter jumps in to take up the slack.
can you see your input voltages and current for each leg? a 15 amp dog-bone plugged into a 30 am to a 50 amp is going to do some weird stuff to the power management system, you really only have 7 amps per leg
my coach is very very sensitive to such set ups and will kick off at the drop of a hat, if any thing comes on. battery charger is going to pull much more amps than the 7 per leg.
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retired Navy driving the short bus 2008 Tuscany 4056
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