Popga Hi Erik, as Brian mentioned I've got a similar setup to you. I started with four lion energy batteries and later upgraded to six. I run the original Multiplus, the 3000VA version and it's been great, but today I'd buy the type 2 to simplify the wiring (it wasn't made yet when I did my install). In mine I bring the shore cord into a metal box where I split out the wiring. I send the neutral, ground, and L2 to my panel and L1 to the Multiplus. I have most of my circuits on L1 to make the most use of power assist.
One thing to keep in mind with the batteries on the tongue is the wire size from the batteries to the inverter. Normally you want that run as short as possible for voltage drop. With them out on the tongue you'll need to go up a wire size or two I'd think. Also watch the maximum current the batteries can output. My larger 3000VA inverter recommends at least three lion or Battleborn as each can put out 100A max. The 2000 you are considering should be fine with two.
One thing to keep in mind with the batteries on the tongue is the wire size from the batteries to the inverter. Normally you want that run as short as possible for voltage drop. With them out on the tongue you'll need to go up a wire size or two I'd think. Also watch the maximum current the batteries can output. My larger 3000VA inverter recommends at least three lion or Battleborn as each can put out 100A max. The 2000 you are considering should be fine with two.
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