Your Battery Bank Size, adjusted to 12 volts? -Poll-

[WooferHound]

Your Battery Bank Size, adjusted to 12 volts ?

[birdhouse]

i've got 8 trojan (6v)  T-125s  not 105's.  i think they're 240Ah each?  in a 24V system gives me 480Ah. 

i think i did the math on a 50% discharge (worst case situation) and found i could pull 3Kw from it without ill effects. 

adam

[WooferHound]

If you have a 24 volt system you would multiply the individual battery capacity times 2 to scale it to a 12 volt system
for 36 volts you would multiply by 3
and a 48 volt system would have the battery capacity multiplied by 4 to adjust to 12 volts

[rossw]

i've got 8 trojan (6v)  T-125s  not 105's.  i think they're 240Ah each?  in a 24V system gives me 480Ah. 

i think i did the math on a 50% discharge (worst case situation) and found i could pull 3Kw from it without ill effects. 

I find it much better to work in "watt-hours" of capacity. Takes all the system voltages out of the equation.

240AH * 6V = 1440 watt-hours per battery. Regardless of how you connect them - all series, all parallel, series-parallel, you have 8 of them @ 1440 watt-hours each = 11,520 watt-hours total.

At 50% depth of discharge (I think that's far too high, by the way) - you have 5760 watt-hours of "usable" capacity, or 5.76 kWh.

(Please note the extra 'h' in there.  "3kw" is a meaningless figure in the context of battery capacity)

[birdhouse]

ross,
yes, i forgot the extra "h".  i try to baby my batteries, and only pull 3Kw "h" from them.  so that's be less than 50% discharge. 

so as per the 12v rating i'd have 960Ah of battery?? 

adam