What gauge wire needed to parallel 12v deep cycles

BFL13 wrote:

mrad wrote:

enblethen wrote:
1200 watts would be about 100 amps.
You could go to auto parts store and get a #2 battery cable with ring terminals on each end.If you have no plans on more load a #4 battery cable would work.

Hmmm... so if I have two 109 hour at @ 1 amp, deep cycle, how long can hope for it to last before falling to 50% discharge ?

EDIT--how will you know you are down to 50%? It is not so easy to tell.
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A 27 will have about 90AH at the "20 hour rate" that rate is the current it takes to go from full to empty in 20 hours. So 90/20 = 4.5 amps. So it takes 10 hours at 4.5 amps to get to 50%.

You have two batteries, so now you can go more than twice that 10 hours at 4.5 amps. (Your 20 hour rate is now 9 amps, and you go longer at lower than that rate --Peukert says so)

I don't know the Peukert factor for those batts but say somewhere like 12 hours or so at 4.5 amps?

BTW I think your problem will be generator time recharging that 180AH pair with your little Vector charger at 12 amps. Say you want to go from 50% back up to 90% and stop the gen.

50-90 is 40% of 180 = 72AH and 72/12 = 6 hours. If the gen is on anyway for some other reason that long, then no problem

The gen will most likely run 8-10 hours a day. I came up with the battery power idea on Black Friday while getting my ice fishing gear ready and brining my boat batteries in for the winter. I thought it would be nice to have some quiet time and to have backup power in case of genny problems (which can happen in -20 and n30 mph winds blowing snow at the gen)

I was thinking I may be down to 3 hours per battery when I read that 700 watts could be 30 amps ( I have limited electrical understanding)