# Solar

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a b B Homebuilt system
April 26, 2010 7:55:27 AM

how long does a 50ah battery empty if a 400 watts computer is loaded on it provided it was full?

a b B Homebuilt system
April 26, 2010 10:36:32 AM

Quote:
how long does a 50ah battery empty if a 400 watts computer is loaded on it provided it was full?

I am not a learned one, but a 400W computer, without any inefficiencies would be a 400W/12V = 33 A drain on your battery.
50AH at 33A drain would only take 1.5 hours to completely drain the battery.
a c 122 B Homebuilt system
April 26, 2010 11:17:29 AM

Sounds like a homework question.
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a b B Homebuilt system
April 26, 2010 11:44:29 AM

Also my math was assuming your computer was pulling a steady 400W. This most likely isnt the case. So it's a variable.

1.5 hr minimum probably up to 2-2.5 hrs.
a c 122 B Homebuilt system
April 26, 2010 3:04:18 PM

And if the battery has a relatively high internal resistance, it may be less than 1.5 hours.
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