First let me set the stage. We boondock 1-2 weeks a year. The rest of the time the trailer is plugged into shore power either in storage or at campground with hookups. We have one house GP27 wet ce...
FIrst Wire Size.. Is determined by the maximum output of your converter. How many batteries does not matter. Converter size does. 6 AWG is about 30 amps.
Second: Battery/Converter size ration affects recharge time in the BULK phase.
THird AGM batteries are VERY EXPENSIVE compaired to say a pair of GC-2 at Sam's or Costco (90 each ish)
Finally Your G-27's are MARINE/deep cycle more than likely really a starting battery you'd be better off with GOLF CAR (GC) batteries.
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