Mysterious Surrette Behavior [RE-wrenches]

[John Blittersdorf, Cent. VT Solar & Wind]

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In a message dated 5/22/2006 5:28:34 P.M. Eastern Standard Time,  
p.undercuffler at conergy.us writes:

In  discussions with other battery manufacturers, I've been told that  the
primary cause of battery failure out of the gate is when the cell  gets
formed in reverse--in other words, somewhere along the line the cell  gets
built backwards.  The cell will take an initial charge, will show  up as
"normal" on the factory floor, but will fail after a short period of  time.



Phil,
   I was lucky enough to have that reversed formation problem on  the one and 
only set of Surrette batteries I have sold.  It was the 4 volt  big 300 
pounders.  It was great fun carting the bad ones away and paying to  ship them back 
for them to look at.  I also had a low sg on another.   Of course, they gave 
the reason for the low sg at inadequate charging.  I  think they should make 
it very clear in their sales literature that these  batteries are not intended 
for the average off-grid home with a single SW4024 or  now the VFX3524.  I 
still have my best luck with T105's for the golf cart  size and lately I am using 
the Interstate UL16 which I believe is made by US  Battery.  I can't wait for 
Windy's battery article but do feel we have read  some of it already on this 
thread.  My basic feeling is that very few, if  any, batteries live up to 
their claims and I automatically de-rate all batteries  at least 30 to 40% in my 
system designs. 
 
John  Blittersdorf
NABCEP Certified Solar PV Installer
Central Vermont Solar  & Wind, Inc.
104 River Street
Rutland, VT  05701

802-747-0577
802-773-0924 fax
802-770-8625 cell
_www.cvsolar.com_ (http://www.cvsolar.com/) 


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