Darryl,
Do you understand the difference between paralleling the "traditional"
off-grid way through the bank and using a buss bar? That was my question.
The installations are quite different.
Tom
--------------------------------------------------
From: "Darryl Thayer" <daryl_so...@yahoo.com>
Sent: Wednesday, December 02, 2009 8:26 AM
To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Strings and series of batteries
I know that C&D battery does not like parallel strings and they have a
device that measures the currents in each string
I investigated a fire from a battery bank of 48 volts 4 strings in
parallel of 6 Volt 800 AH batteries. The parallel strings was indicated
as bad practice and suspect as the cause of the fire. The battery bank
was on a standalone system and had poor regulation on charging. (it was
being charge controlled by a diversion controller)
Also the fire in New Jersey was a parallel string case of 12 volt AGMs in
4 or more parallel strings (anybody remember better than I?).
DT
--- On Wed, 12/2/09, Tom Elliot <tell...@wagonmaker.com> wrote:
From: Tom Elliot <tell...@wagonmaker.com>
Subject: Re: [RE-wrenches] Strings and series of batteries
To: "RE-wrenches" <re-wrenches@lists.re-wrenches.org>
Date: Wednesday, December 2, 2009, 11:58 AM
Message
I 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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