I would suggest looking at the Magnum MS series if you are installing big batteries.
We installed four Lifeline 6CT 6Vdc 300 amp hour batteries (about 92 pounds each) in a custom stainless steel box behind the propane tanks along with eight 100 watt AM Solar panels and use a Magnum MS2812 to generate 2800 watts of pure sine wave power as well as charging the batteries based upon the battery temperature, air temp etc.
Wire size is important when looking at the 400 amp fuse going to the Magnum from the batteries.
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TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Dill TPMS, disc brakes, 16" tires & wheels