Our Inverter is installed in a similar configuration as yours and we do not have a problem running extra appliances. We do have a MAGNUM 3012 Hybrid which allows me to set the amount of power I want to draw from the shore connection and the rest of needed power comes from your batteries. So it sounds like to me your Inverter is to small to handle the load in your configuration. We have had no problems with our trailer power but we also only figure on 30 power coming in. I am not a expert on trailer power but I know a lot of MOC members are and will be posting shortly.
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2020 Ram 3500, 2022 Luxe 38GFB,2500w Solar with Victron equipment, Gen Y Pinbox
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