[RE-wrenches] 5 battery strings

[Glenn Burt]

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 <mailto: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 <http://www.taitem.com>  [1]

Links:
------
[1] http://www.taitem.com/
_______________________________________________
List sponsored by Redwood Alliance

List Address: RE-wrenches at lists.re-wrenches.org <mailto: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 <http://www.re-wrenches.org/etiquette.htm> 

Check out or update participant bios:
www.members.re-wrenches.org <http://www.members.re-wrenches.org> 

_______________________________________________
List sponsored by Redwood Alliance

List Address: RE-wrenches at lists.re-wrenches.org <mailto: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 <http://www.re-wrenches.org/etiquette.htm> 

Check out or update participant bios:
www.members.re-wrenches.org <http://www.members.re-wrenches.org> 





 

-- 

Chris Schaefer’s
 <http://www.solarandwindfx.com> 
Tel/Fax 585-229-2083 or Cell 585-748-1870 
5115 South Hill Road ~ Canandaigua New York 14424
www.solarandwindfx.com <http://www.solarandwindfx.com>  ~ E-mail: chris at solarandwindfx.com <mailto:chris at solarandwindfx.com> 

  <http://solarandwindfx.com/wp-content/uploads/2015/01/certs.jpg> 

Thomas Jefferson, the author of our great Constitution, once said, "democracy" will cease to exist when you take away from those who are willing to work and give to those who would not."

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20180723/c09f6f6d/attachment.htm>