[RE-wrenches] 5 battery strings
tom at wagonmaker.com
tom at wagonmaker.com
Wed Jul 25 14:32:15 EDT 2018
So you're willing to risk total system shutdown if a single cell fails?
It just seems like a big risk even if the batteries are considered
highly reliable. I always planned to minimize the risk of failure
causing a power outage. A buss bar arrangement with more strings
provides redundancy and reduced downtime while still being very stable,
more stable than an interconnected series/parallel arrangement.
Tom
On 2018-07-25 00:39, Tump wrote:
> Perhaps suggesting the correct amp Hr battery bank would eliminate the
> _need_ for buss bar. 2 volt EX1400 1K amp hour batteries work very
> well good warrantee. all the fusing & interconnects would be
> eliminated. MORE AHs = less interconnects, always the correct way to
> go!
>
>> On Jul 24, 2018, at 9:40 AM, Dave Tedeyan <dtedeyan at taitem.com>
>> wrote:
>>
>> Thank you all for the ideas and suggestions. This person in
>> particular had #4 wire for the battery connections,
>> so they are all getting replaced with anyway. So it seems like
>> rewiring to a busbar with fuses will be the way to
>> go. And although not ideal to have so many strings, this will be
>> more cost effective than just getting a whole new
>> battery bank right off the bat when they have 10 batteries that have
>> essentially never been used.
>>
>> Cheers,
>> Dave
>>
>> --
>>
>> Dave Tedeyan
>>
>> SENIOR ENGINEER
>>
>> TAITEM ENGINEERING, PC
>> 10 Verizon Lane, Lansing, NY 14882
>> Voice: (607) 930-3481 x6
>> www.taitem.com [1]
>> On Mon, Jul 23, 2018 at 8:50 PM, Glenn Burt <glenn.burt at glbcc.com>
>> wrote:
>>
>> Hi Christopher,
>>
>> I buy my copper buss material from McMaster Carr in appropriate
>> dimensions for the current I am expecting.
>>
>> I then cut it to the lengths I need, drill for appropriate size
>> fasteners and use 2 layers of heat-shrink tubing to protect the
>> exposed bar.
>>
>> Hope this helps.
>>
>> -Glenn
>>
>> FROM: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> ON
>> BEHALF OF Chris Schaefer
>> SENT: Monday, July 23, 2018 2:28 PM
>> TO: RE-wrenches <re-wrenches at lists.re-wrenches.org>
>> SUBJECT: Re: [RE-wrenches] 5 battery strings
>>
>> 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
>>
>> TAITEM ENGINEERING, PC
>> 10 Verizon Lane, Lansing, NY 14882
>> Voice: (607) 930-3481 x6
>> www.taitem.com [1] [1]
>>
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> --
>
> Chris Schaefer’s
> [8]
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