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Re: battery power (amps)?


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Posted by Errin OH on April 05, 2012 at 13:38:13 from (71.79.151.12):

In Reply to: battery power (amps)? posted by dave2 on April 05, 2012 at 12:51:13:

Yes and no, depends on what you want to do with it. Batteries are rated for specific draw over a specific time. A 26AH battery will not hold a 26 amp draw for an hour. What it will do is hold say a 1 amp draw for 26 hours. That is why car batteries are like 500 CCA rated they will supply 500 amps for so many seconds (most fall in the 50Ah rating). So, you need to figure the draw and then how long you want to draw it. From there determine the AHs. If you want to say draw 1 amp for 100 hours you need something like a 100AH rating. At 10 amps the time is reduced to like 10 hours (the higher the draw affects overall rating).

So yes you can put three in parallel and have a 78AH battery, but it will not hold a 78A draw for an hour. May do something like 6-7 amps for 8-10 hours. Make sense? There is a lot more to it (voltage levels, draw rate, temp, charge times, etc..) and these numbers just examples of the relationship between draw and rating. You need to have a little more data to compare the batteries.


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