I have a 12V auto battery (rated 525A cold crank at 32F, reserve capacity 70), and a 400Watt (800W peak) 12V dc to 120V ac converter. How long can I use this setup to power a 26W fluorescent light bulb during power outage?
by 
supersizeme
ANSWERS: 1
-
Well,first work out capacity: Figures are: 70minutes = 1.16hours, at 25amps (is RC standard), & 12.5Volts (an estimate between 13.8 and 10.5, based on 26W). These give 25*12.5*1.16 = 362.5 watt-hours If you assume 90% efficiency of the converter, then it will run for 0.9*362.5/26 = 12.5hours. I would guess this is a pessimistic length of time, because it is derived (extrapolated) from a 25 amp discharge rate. The actualy time should be longer (because actualy discharge should only be around 2.1 amps). If you have the "Amp-hour" rating of the battery, that would be a better figure to use.
RELATED QUESTIONS
Copyright 2023, Wired Ivy, LLC