Deka DC31DT battery? Deep Cycle?

DiskDoctr wrote:
I'm missing the 105ah/battery part? Unless it is due to 50% usable?

The spec I was quoted is 220ah @23amps, which matches what I saw in the specs when I did a search.

OK, one more time - when comparing one deep cycle battery to another you want to be comparing them at the 20 Hr rate. That DC31DT you're referring to is 20 Hr rated @ 105 AH, two would offer 210 AH, so obviously a pair wired in parallel drawn down to 50% SOC would offer you ~ 105 usable AHs. As far as heavy inverter draw is concerned 12 volt jugs will inherently suffer less voltage drop under heavy load than a pair of similarly rated 6 volts in series simply because internal resistance will be lower.