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I have the Motomaster 1750W. It just beeps if I try to turn it on with only one set of wires connected. When I run a pair of +/- cables from each of the connections, even to the same battery, it works find.
DO NOT DO THIS! If I understand you correctly you want to have three ways to have 110 power in your motor home--- (1)Vehicle 12V to inverter to main panel. (2)Generator to main panel. (3)plug the main panel into 110V. If any two of these are connected at the same time and they are both live, somethings going to blow. That's because with AC, the two sources must be synchronized in their cycles very precisely. The utility company connects their power plants together on the grid only with the aid of precise controls. But the really serious problem is the same reason they invented transfers switches for home generators -- if you were connected to (3) and the power went out, and you connected (1) or (2) without disconnecting the dead (3), you will backfeed power to the line outside and you just might kill the lineman who is trying to fix the power outage.
the solar panel is just to charge your inverter,if it is charging and
the inverter is on it will drain the current the solar panel is
supplying to the batteries,this makes it look like it is not charging
,so i advice you to switch off you inverter when charging it,get
another set of batteries connected to your solar panel then charge
both, let them be separated so that the new one is not in use so that
when solar is out you can switch to the other set of batteries