[RE-wrenches] Batt Cap AGM

[Sindelar Solar]

Jerry,

You write "I'm sure you know this..." but I don't know it. I don't think 
I have heard this before, as you have presented it.

How do you rotate strings? Where did you learn this? Is there an online 
source that you can provide?

Thanks, Allan

On 11/20/2018 6:21 PM, jerrysgarage01 wrote:
> Wrenches, Drake
> You may consider contacting "Batcap" and bank if they have a best 
> practice for the battery configuration, this might be it but at least 
> a starting point. I have had multi string batteries that seamed to 
> like being rotated through the bank, sounds like alot of work and it 
> is but this will swap higher resistance strings for lower ones. I'm 
> sure you know this but each battery has internal resistance to charge 
> and even discharge so rotating them reduces the effect and may in time 
> help to improve the battery life.
> Jerry
>
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
>
> -------- Original message --------
> From: Drake <drake.chamberlin at redwoodalliance.org>
> Date: 11/20/18 8:41 AM (GMT-08:00)
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
> Subject: [RE-wrenches] Batt Cap AGM
>
> Hello Wrenches,
>
> An owner of an existing system has a bank of twenty, 100 AH, 12 V Deep 
> cycle batteries of the Batcap 
> <http://www.xstaticbatcap.com/what-is-a-batcap-.html> 
> <http://www.xstaticbatcap.com/what-is-a-batcap-.html>brand.
>
> The bank is made up of four sets of 5 batteries in parallel to produce 
> *500 AH battery sets at 12 V.* These four parallel sets are then 
> wired  in series to give a 48 V nominal bank.
>
> The battery voltages vary from around 13 to 15 volts. The bank is 
> about 5 years old. The CEO of Batcap told the system owner that these 
> batteries have lasted up to 30 years in solar applications, so he has 
> high expectations for these batteries being around for a while.
>
> My first impulse is to rewire the bank in a normal series - parallel 
> configuration. But there are too many strings to do this without a bus 
> bar. Besides, the batteries are likely damaged, and rewiring them 
> might cause the bank to exhibit unsuspected problems. How much money 
> is worth putting into this bank? $0?
>
> The owner seems like a reliable guy who likely hired the wrong 
> installer. He could use some help. What would you do in this 
> situation? Rewire the bank, leave it well enough alone or run for the 
> hills.
>
> Thanks,
>
> Drake
>
> Drake Chamberlin
> /Athens Electric LLC
> OH License 44810
> CO License 3773
> NABCEP Certified Solar PV
> 740-448-7328
> /http://athens-electric.com/
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>
-- 

*Allan Sindelar*
allan at sindelarsolar.com <mailto:allan at sindelarsolar.com>
NABCEP Certified PV Installation Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20181121/3e8f6751/attachment.htm>