MessageI would be very curious to hear THE battery company's, or any battery
company's, interest in warranty on a system where the strings of batteries are
paralleled through a buss bar rather than physically through the bank. The
vulnerability to failure of an off-grid system with only one or two series
strings is high enough to be a concern. Then there's also the not un-trivial
issue of handling large batteries safely.
From: Tump
Sent: Wednesday, December 02, 2009 2:32 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] Strings and series of batteries
Surrette Battery, THE battery company suggests NO MORE the 3 parallel in a
string & would like to see 2 preferably.
If there are more the 3 then they really not interested in warrantee issues.
Jamie where are you??????
Now a days there are plenty of options for a good size/AH BB that can be
configured in 1 or 2 parallel strings.
Its just that us old guys are having a harder time w/ gravity!
t...@swnl.net www.SWNL.net
Solarwinds Northernlights
Serving Mid Coast Maine & Northern California
Me.# 207-832-7574 Cl.# 610-517-8401
Blair "TUMP" May
******** MAINE'S CHARTER ********
NABCEP "Certified PV Installer"
******** MAINE'S CHARTER ********
Trace Xantrex "Certified" Dealer / Installer"
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Dana
Sent: Tuesday, December 01, 2009 12:58 PM
To: 'RE-wrenches'
Subject: [RE-wrenches] Strings and series of batteries
On a similar subject here -
Long ago, I had a Trojan battery rep. state that they did not like to see
more than [12] L-16s in a series -parallel bank system. This was due to too
many points of connection / resistance and bad communication due to multiple
flow paths.
Has anyone else heard similar or contrary information/recommendations?
Thanks
Dana Orzel
Great Solar Works, Inc
www.solarwork.com
E - d...@solarwork.com
V - 970.626.5253
F - 970.626.4140
C - 970.209.4076
I will be the shift in how the world uses power! - Dana Orzel
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Larry Crutcher,
Starlight Solar
Sent: Tuesday, December 01, 2009 10:42 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] concord batteries, EQUALIZE Them!
If the 180 watt panel will provide enough current to run the recovery
process, then give it a try. What I expect is that your current will vary
throughout the day. Not sure if this is a critical point or if it will just
prolong the process. Pay attention to the temperature. I use a laser temp probe
on the terminals every 30 minutes to verify.
Another thing to monitor is the current. It will probably start very low and
build over time due to high resistance from sulfated plates. During this time
the voltage might get really high and then lower some. Don't worry about the
voltage. After a while the current will begin to drop. This means the recovery
process is working.
I just realized that this battery bank must be 4 in series and ten parallel
strings. This is a horrible design that can never work right without extensive
monthly maintenance. The strings with higher resistance will not be charged
properly. Because of this, many strings will be undercharged every day. EVERY
day! So even if you recover these batteries, someone will need to test and
equalize at least every month. I really want to stress this point as multiple
parallel batteries are the ruin and waste of many thousands of tons of
batteries each year. I never design for more than two strings in parallel. Do
this and be happy.
Larry Crutcher
www.starlightsolar.com
la...@starlightsolar.com
(928) 941-1660
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