Quote:
Originally Posted by multiweb
What would you recommend? Need to draw 4-6Ah max for 10 hours.
Thanks for any pointers
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Is that 4-6Ah max(0.4-0.6A for 10 hours)
or 4-6A max for 10 hours (40-60Ah)?
If the former you'll only need a smaller battery, say 20Ah,
if the latter, the 100Ah mentioned is bang-on.
Get the largest you can afford and can comfortably move around, as the deeper you discharge the shorter the life of the battery.
SLA's lasting 20+ years is not uncommon if looked after and shallow discharged.
The following is an indication of what effect Depth Of Discharge will have on cycle life...
(!! Manufacturer dependant(Energystore shown), check your manufacturer's data-sheet)
4,000 cycles @ 10% DOD
3,800 cycles @ 20% DOD
3,500 cycles @ 30% DOD
2,500 cycles @ 50% DOD
1,500 cycles @ 80% DOD
(your 75ah battery @ 6A x 10h discharge = 80% DOD.... actually deeper because the 75Ah rating is likely at standard 20hour rate(3.75A x 20h), just to complicate things!!)