[RE-wrenches] 5 battery strings

Wed Jul 25 14:48:00 EDT 2018

That's true for 48 v systems but not 24v.

Ray Walters
Remote Solar
303 505-8760

On 7/25/18 12:44 PM, Matt Partymiller wrote:
> Most systems will operate down 2 volts without a problem.  Warrants
> reconfiguring but often the homeowner won't even notice for a few days.
> In the past month I have had Outback and Sunny Island customers running
> down a cell.   Sunny Island is reconfigurable to manage the situation
> better.
>
> Removing a single cell is losing less stored capacity than removing an
> entire string.
>
> Matt
>
>
> On Wed, July 25, 2018 2:32 pm, tom at wagonmaker.com wrote:
>> 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]
>>>>
>>>> Links:
>>>> ------
>>>> [1] http://www.taitem.com/
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>>> --
>>>
>>>
>>> Chris Schaefer’s
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>>>> TUMP at SWNL.NET [6]               WWW.SWNL.NET [7]
>>>>
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>
> Matthew Partymiller
> Solar Energy Solutions LLC
> (877) 312-7456
> matt at solar-energy-solutions.com
>
>
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