Adding an extra battery to my RV

Be careful mixing chemistries in batteries without an isolator , and be sure your charger can manage different chemistries at the same time . Some need to be set for a battery type .
Doing a load calculation for what you require to run is important, so not only do you know what you use , but also what you don’t use . We had three batteries in our RV , a starter battery that only started the engine , separate from everything. And two deep cycle flooded conventional batteries , I went with deep cycle group 31 to after pulling two huge G2 golf cart


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We have 5 in our van 300 amp lithium for the AC only separate system and chargers. Also the starting battery and 3 agm house batteries for lights and fridge etc. Works very well and is nice to have ac all weekend without being plugged in.

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It’s getting easier to have sophisticated systems as the tech get shared across platforms and manufacturers can make stuff for overlanders , RV , boats and off grid cottages


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