[RE-wrenches] Strings and series of batteries

[James Surrette]

Hi Tump et al. 

In the UK, so sorry for slow response. 

Must echo your comments.  A series string is, without a doubt, the most
efficient and things just get more complicated (connections, numbers of
cells, voltage disparity) as you add parallel strings.  Per Tom's
comments, the only solution to multiple banks is bus bars  

Regards, 

Jamie


James Surrette

Surrette Battery Co. Ltd
1 Station Rd.
Springhill, NS, CAN
B0M 1X0

Direct: 902.597.4027
Fax: 902.597.8447




>>> "Tump" <tump at hughes.net> 12/2/2009 8:32 AM >>>

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! 

  

  

    Tump at swnl.net        www.SWNL.net ( http://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-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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 - dana at 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-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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 

larry at starlightsolar.com 

(928) 941-1660 

   
 


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