One Battery..or Two?

If you are going to be boondocking, the more battery you carry, the longer you can go between charges. The dealer supplied battery is usually a group 24. Dual g24's will double your usable aH's. Switching to dual GC2's will nearly triple them. 

We use 2  12v  group size 24 deep cycle.  When these expire, they are beginning year 7 now, I plan on replacing with 2  6v golf cart batteries.  As for now we plan on 3 days per battery when the night temps are upper 30's to lower 50's, that is using the furnace a fair amount at night to keep it around 60.  During the day, not much gets used as we are normally outside hiking.  Fridge, HW tank, and LED lights use minimal battery compared to the furnace.  

I just switched out my 12v group 24 deep cycle for 2 GC2's (golf cart batteries), so now I'll find out how much time I'll get from them.  I am waiting for a some 8 awg connectors to finish the pig tails to connect to the battery for a fast connection to the 100w solar panel and controller.  Hopefully, this will make us pretty self sufficient for purposes of electricity.  The only issue will be if we need the AC.  In that case, we'll have to connect to shore power or use a generator, which I can put in the back of my truck if we're going where we think we'll need it.  I'm saving my old 12v as a spare and will keep it charged in the garage so it's ready to load if we anticipate needing it.

Thanks!

Interesting to note that when we purchased 126 new golf carts from Yamaha we were given the opportunity to test drive their new electric carts (we purchased gasoline powered carts).  I was very impressed, lots of power BUT also surprised that they have moved away from 6 volt batteries used in the 36 volt systems for many years.  Now they have gone to a 48 volt system and use 6  8volt batteries instead.  Hopefully the 6 volt batteries will be around for a long time.