[RE-wrenches] 5 battery strings

[Chris Schaefer]

What source are you all using for buss bars for these multiple battery
string set ups?

Christopher

On Mon, Jul 23, 2018 at 2:16 PM, <tom at wagonmaker.com> wrote:

> Separate out the individual series strings and run each string to a buss
> bar setup.  Remember it isn't just resistance differences between batteries
> but resistance difference between cells as well.  In a setup like the
> existing one the resistance differences can really add up and if one
> battery fails the entire system will be offline.  Running each string to a
> positive and negative common buss bar means you can remove individual
> strings without disrupting the entire storage and the system can continue
> operating.  Also, it means the only resistance issues of substance are
> within individual series pairs not the entire interconnected bank.
>
> I ran 10 series pairs of 12v AGM batteries, each pair to a common buss and
> it was the longest lasting, most stable battery bank I had.  That was years
> ago and now it would require fusing each string but for longevity and
> stability it is the best bet.
>
> Tom
>
> On 2018-07-23 03:56, Dave Tedeyan wrote:
>
>> Since we are on the topic of bad battery practices...
>>
>> I may be fixing up a system that was both designed and installed very
>> poorly.
>> They have a 24V Outback VFXR inverter, and ten 12V AGM batteries wired
>> into
>> 5 parallel strings. I know that is a bad idea, but since they already
>> have the
>> equipment, are there any safety issues by re-using this equipment? It
>> is for a
>> grid tie battery backup system that will remain in float most of the
>> time. I assume
>> that the batteries will not last particularly long, but is there any
>> harm in using them
>> and then just getting new batteries once they fail?
>>
>> Stringing is shown in the attached picture.
>> Cheers,
>> Dave
>>
>> --
>>
>> Dave Tedeyan
>>
>> SENIOR ENGINEER
>>
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