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AMP-HOURS to KWHs conversion

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Posted by pokhara@yahoo.com on January 14, 2007, 9:00 am
 
how do i convert amphours to kilowatt hours for a 12v 80 amp hour
battery ?

ie if I use 40 amp-hours from the battery how many kilowatt hours is
that ?

is it just 40 times 12 = 480 watthours ie .48 kw hours ?




Posted by Ron Rosenfeld on January 14, 2007, 12:37 pm
 
wrote:



Posted by George Ghio on January 14, 2007, 12:49 pm
 pokhara@yahoo.com wrote:

Posted via a free Usenet account from http://www.teranews.com


Posted by pokhara@yahoo.com on January 14, 2007, 2:16 pm
 On Sun, 14 Jan 2007 23:49:52 +1100, George Ghio


wow. thats not much,

my brother has an 80 amp hour battery which he charges using a
generator.

it takes him about 2 litres of petrol to fully charge it which cost
him 1.80 gbp.

assuming he gets 40 amp hours out of it that means 1/2 kwh has cost
him 1.80 gbp.

i get it off the grid for 10p per kwh,

he lives in a caravan.

this is costing him a fortune. there must be better ways for him to
get power (he cant afford wind or solar).




Posted by Martin Riddle on January 14, 2007, 9:10 pm
 
2 liters is a lot.  I recharged a marine Deep cycle to ~90% with less than a
quart (tiny gas tank) with a 2hp brigs tied to a GM alternator.
Whats he using? A 3kwatt generator with 12v charging stub?

Cheers



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