06GTORR wrote:
one is 225 amp hrs other is 370 amp hrs.
well it looks like i can only pull(t105) 10 amps per hour and(l16) 18 amps a hr for 20 hrs
its sound like it wouldn't last long powering a camping ? but i feel like this is way more then enough batteries with a 4400watt 48volt magnum inverter
The 20hr rate (in amps) for the 225AH pair is 11.25 amps. You can draw that for 10hrs to get to 50% left on the battery, which is as low as you would normally want to go.
If you have a higher amp draw than that, you will get less than 10 hrs and that is not linear (see Peukert) and if your draw is less than that you can go longer before reaching 50%
RVing usually means a mix of high and low draws but 11 amps would be a typical sustained amount.
If your bank is higher in AH, and your typical draw is still 11 amps, you gain extra due to Peukert. The 370AH bank has 18.5 amps as the 20 hr rate, so operating at 11 amps gets you much longer than the 10 hrs to get to 50%.
Somebody with a Peukert calculator could show (I think) that the extra time is more than (370/225 x 10 = 16.4) that 6.4 hrs.
