I can sense there is curiosity about my style of camping and thus battery needs so here goes.
The trailer currently has one battery. Our usage is light. The battery is only supplying power for the 24 hours prior to our adventure. The loads being CO, CO2 monitor, TPMS booster(re another post yes I did buy a TPMS) and whatever the refrigerator control circuitry needs.
Our outings are on average 1-2 days every few weeks. This will increase as we become more experienced but I don't see more than week at a time. Thus far everywhere we have gone there is shore power. I don't intend to purposely go without shore power until the generator capability can support full trailer loading.
During storage the battery is disconnected. So if 6-7% loss per month is correct for wet cell then a battery is still in the 90% range when reconnected. It's a thirty minute drive from storage to home. During the winter the battery will be removed.
With the exception of the higher self discharge rates wet cell seems the way to go. Off gassing, spillage and orientation of the battery is of no concern since it sits outside and is rigidly mounted. We have yet to dry camp. Although IF I can't get a spot at the track then dry camping will occur. I have a small generator that can recharge the battery.
I was thinking two size 27 wet cells. Two deep cycle Everstart Walmart 27DC-6 batteries plus boxes = $174. They are 109 amp/hr with 750 MCA @ 32°F per the salesperson and 115 amp/hr and 720 CA in the picture. What I like about their batteries is when I did return one after significant usage they said "go get another". No questions asked.
But I have to answer the question: "With our current camping requirements do we need two battery capacity?" Like the scouts I want to be prepared. Shore power is never guaranteed.
