- #1
bobjenkins777
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Sorry if this is in the wrong section (it isn't homework). I am trying to form a basic understanding of electricity. Right now I'm attempting to figure out how to calculate how long a battery will last with certain devices.
I might be completely off base but here's what I've got.
12volt battery rated at 250Ah
Device is rated at 115volts 10000 BTUs, that's 2931W-h
2931 / 12 = 244 amps (97.7% = of battery capacity)
--
Likewise
Battery capacity 12 x 250 = 3000watts
Using 2931 in one hour is 97.7 %
Not sure if this is correct was picturing a car battery and a portable ac unit
...one other
Battery rated at12volt and 12Ah
Device 1420mAh (iphone)
12000mAh battery at 12 volts
12000/1420 = 8.45
Does this mean I can charge the iphone 8.45 times off the other battery?
Also is there any calculation required when using a power inverter? (I would be using a power inverter to go from dc to ac in these examples. (Not that id ever want to power a 10000btu ac unit in my vehicle lol)
Thanks
I might be completely off base but here's what I've got.
12volt battery rated at 250Ah
Device is rated at 115volts 10000 BTUs, that's 2931W-h
2931 / 12 = 244 amps (97.7% = of battery capacity)
--
Likewise
Battery capacity 12 x 250 = 3000watts
Using 2931 in one hour is 97.7 %
Not sure if this is correct was picturing a car battery and a portable ac unit
...one other
Battery rated at12volt and 12Ah
Device 1420mAh (iphone)
12000mAh battery at 12 volts
12000/1420 = 8.45
Does this mean I can charge the iphone 8.45 times off the other battery?
Also is there any calculation required when using a power inverter? (I would be using a power inverter to go from dc to ac in these examples. (Not that id ever want to power a 10000btu ac unit in my vehicle lol)
Thanks