Dry camping batteries

Larosa,

My 12 volt jars are 141.5 amp-hours each, yielding 283 usable amp-hours. Go 12 volt! (But do wire in a balanced manner).

With the 4 12 volts @ 75 AH each you have 300 AH minus 50% discharge = 150AH

With 4 6 volts at 220ah each youll have 440 ah minus 50% discharge = 220 AH

Its a no brainer.. Go 6 volt

As you said, use them until they need replacement. Then, if room allows, switch to two pair of 6v GC2 golf cart batteries or whatever will fit in your available space. I have had much better service life from the 6V true deep-cycles than I have had from "deep cycle" 12-volt batteries.

When you are using four batteries it is pretty much a wash I would think using two groups or 6V batteries in series or four of 12V batteries in parallel..

Use the TROJAN BATTERY Specification Guide and compare the different battery AHs, weight, and Reserve power...
TROJAN ProdSpecGuide

The Trojan T105s having two groups of 6V batteries in series will most definitely give you around 450AHs and you can draw down 25AMPS for over 7 hours... These will weigh around 240 lbs of batteries. Use the TROJAN battery chart for four 12V batteries with same GP Size of the brand you may wanting to purchase... See what you come up with on how long they will produce 25AMPS. the chart numbers is listed in minutes...

You can most likely get somewhere near the same results using four 12V batteries in parallel. The cost may be higher not using the low cost for the T105s that all of the golf carts use... $400 for four 6v batteries as compared to around $600 for four 12V batteries...

Both groups of batteries will weigh around 240lbs total

I would imagine the 6V battery bank will have more grunt power than the 12V battery bank...

I will be installing two groups of Trojan T105s 6V batteries in series in my upcoming 12VDC new Battery bank...

Roy Ken