Solar

[Guest]

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

 

[cmcghee358]

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.

 

[jsc]

Sounds like a homework question.

 

[cmcghee358]

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.

 

[jsc]

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