That was a lesson we learned with our old coach. It had 2 wet cell 12v batteries and the inverter would only make it 4-5 hours on battery power. We updated to AGM group 31 batteries and we could go 8-9 hours. There were some other parasitic drains on the batteries so we added 400 watts of solar to keep the batteries charged during daylight hours and limit generator usage. That helped overnight battery usage some, upping time on battery to around 10 hours.
In our new Thor Hurricane, we immediately had the dealer install two additional batteries and added 400 watts of solar panels. We have been dry camping frequently without issue but we wanted even more time so we just updated our 4 batteries to group 31 AGM Interstates. We are still waiting to see how they perform.
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John
2016 Thor Hurricane 35C with pups Piper and Annabelle
2013 Ford Fiesta toad
FMCA - F457085
Blog - https://traversity.us
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