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.chamber...@redwoodalliance.org>
Date: 11/20/18 8:41 AM (GMT-08:00)
To: RE-wrenches <re-wrenches@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/
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--
*Allan Sindelar*
al...@sindelarsolar.com <mailto:al...@sindelarsolar.com>
NABCEP Certified PV Installation Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy, Inc.
*505 780-2738 cell*
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