This transfer switch only has 3 connections. I planned on running my Victron Energy MultiPlus-II Pure Sine Wave Inverter Charger, UL-Certified, 24/3000/70-50 120V into the generator connection and my shore power in my rv to the shore power wich will attached to my 50 amp generator because I live off grid. Will this work? And will running my shore power recharge my batteries or do I have connect my generator to the inverter itself?
Typically speaking, your generator runs to the generator input of the transfer switch, your shore runs to the shore input of the transfer switch, and the load output of the transfer switch runs to the AC input of the MultiPlus.
When I install a multiplus into a transfer switch like that I interrupt the wires going out to load. Wire your Multiplus AC IN to the load side of the transfer switch(like @Justin said) and then your AC Out to the loads(service panel). This way whether you are running on shore power or generator it will charge through the Multi and utilize its internal transfer switch. The transfer switch on your RV will do its job switching between shore and generator and the Muliplus transfer switch will do its job switching between inverter and whatever source(generator or shore) is coming into it.
Seems like in your situation where your generator essentially is your shore power you would still run the multi on the load side as I mentioned above. I see no reason why this wont work. I wouldn’t wire it into the generator side. You wont be utilizing the internal transfer switch or the charger since the multi will only be on when shore power(generator) is not.
Are you asking if you can wire the Single phase multiplus into the transfer switch with the two phase(50 amp) generator and switch back and forth between the two?
I think the short answer is no. I would recommend wiring the multiplus as stated above(on the load side) and only wiring it on one side of the 50 amp service as it is designed. You can rearrange your breakers so the critical loads you want to power are on that side(as long as you don’t overload it) When not on generator you will lose the other side of the service. Or get a 120X2 unit. That would be the best option. Hope that all helps.