0iceng 8 years ago ReplyUpvoteSo you want to know how much of a battery to run 4.9 amps for 40 hrs. Recently some one said a top, car battery could do 80 Amp Hrs. That suggests about 16 hrs per battery and 3 car batteries to run two fans and a pump over 40 hours. You do understand as the battery discharges the voltage falls to 10.5 VDC at 100% discharge. Your fans and pump will slow down with battery discharge. see TimAnderson's ible Easy Test of Battery Amp-Hours Capacity for more info. A
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8 years ago
So you want to know how much of a battery to run 4.9 amps for 40 hrs.
Recently some one said a top, car battery could do 80 Amp Hrs.
That suggests about 16 hrs per battery and 3 car batteries
to run two fans and a pump over 40 hours.
You do understand as the battery discharges the voltage falls
to 10.5 VDC at 100% discharge.
Your fans and pump will slow down with battery discharge.
see TimAnderson's ible
Easy Test of Battery Amp-Hours Capacity
for more info.
A