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Author Topic: Can a battery bank be to big?  (Read 1712 times)
jason
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« on: March 06, 2008, 09:00:35 AM »

just wondered some one must have some ideas on this.
jason
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RichardKB
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« Reply #1 on: March 06, 2008, 09:39:58 AM »

Hi quick answer yes, all batteries self discharge so you will get to a point where a lot of your captured energy goes into just keeping them from self discharging.

Rich
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stephend
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« Reply #2 on: March 11, 2008, 08:53:18 PM »

I think it's better to err on the side of a bigger battery bank, rather than one which is too small.  Also an oversized bank means less DoD for each battery - and therefore a longer life.
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Bob
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« Reply #3 on: March 12, 2008, 06:34:45 AM »

Jason,

Too big for what?  I guess you mean too big for it's charging source?

The answer is a definite yes.  If you have a 30w PV attached to 1500 Ah then it will work well for a time but quickly go into terminal decline.  If you have a 2kw wind turbine on a 75Ah leisure battery it will spend all it's time heating the dump load.

Generally the battery should be sized to the charging source ans the usage.  It is a very difficult thing to get right.
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