If you can afford the weight, 2 batteries is always a good idea anyway as the depth of discharge will be less for any given period between charges. This way your batteries will last a lot longer.
After some research, we bought two new, identical (113AH) batteries and added 80W of solar panels. As yet not tested on long wild stops but solar panels keep batteries topped up outside house without having to run hook-up cable down the drive, and thus preventing discharge damage.
We have twin 85amp batteries, and 800watt invertor, 240 volt tv and we just had 2 seperate weeks away wildcamping and we never run short of power, we dont have any solar panels either.
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