RV vs residential refrigerator?

BFL13 wrote:

otrfun wrote:
Assuming one was powering a residential fridge with an inverter that drew 12a (at 12vdc) when the compressor cycled, how long would it take to discharge a bank of four, GC2, 6-volt batteries from 12.7 to 12.2 volts, under a worst case, full-on, 100 percent duty-cycle?

50 percent of 440 = 220AH/12a = 18.33 hours, but that does not allow for Peukert. The 20 hr rate for 440 is 22 amps not 12, so it should take longer than 18.33 hours. Looking at it another way, at 12a draw the capacity is more than 440 but I don't have the tables to show how much more.

Also ignoring "inverter creep" where its amps draw goes up as battery voltage falls, which will make average amp draw a little higher than 12 but do we need exact numbers here?

Thanks for breaking down the numbers, BFL13. Based on your calculations it would appear four GC2 batteries should last at least 24 hours (discharging from 12.7 to 12.2 volts) if the refrigerator's duty-cycle was reduced to a more realistic 35-50 percent. That's good to know. Thanks again!