[RE-wrenches] 24 volt Battery Bank comparison

[boB Gudgel]

OK, I've been hearing for years now that one battery string is best and 
maybe two but no more should be used.

What is the reason for this fear ???    What is the experience with 
multiple strings in parallel ??

If it is because of current sharing of the strings, that shouldn't be an 
insurmountable problem if the wiring is done right.

If it has to do with the possibility of fire, which Darryl mentioned, 
seems that series string fuses could mitigate the possibility of that 
issue, if because of shorted cells, just like PV combiners.

Or maybe it has to do with the trouble of getting into the middle of a 
pile of batteries ?  Use battery boxes ?

The strings are in parallel and so they all get the same voltage, 
theoretically anyway if the connections are good.

I would think that the more strings, the LESS stress on individual 
batteries, not more.  The current in each battery should be less than it 
would be I would think.

So what is the real experience ??

Is a battery balancer the answer ??

Thanks,
boB





>
> On May 31, 2011, at 8:23 PM, "Wayne Irwin" <wayne at pureenergysolar.com 
> <mailto:wayne at pureenergysolar.com>> wrote:
>
>> I think the verdict is*12* - Rolls 2-YS-31 2430 AH @ 20 HR (one 
>> string) and one dry spare in storage is the best case scenario!
>>
>> Wayne Irwin, EE
>> Director of Engineering
>> Pure Energy Solar International Inc.
>> State Licensed Solar Contractor
>> License # CVC56695
>> Wayne at PureEnergySolar.com <mailto:Wayne at PureEnergySolar.com>
>> http://pureenergysolar.com
>> 352 377-6527 Office
>> 352 336-3299 Fax
>> 352 316-1637 Cell

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