[RE-wrenches] Battery capacity testers

[toddcory at finestplanet.com]

"The battery choice was the decision of the system owner."

Since when does the customer make these decisions?

Todd

On Monday, October 4, 2010 6:36am, "North Texas Renewable Energy Inc" <ntrei at 1scom.net> said:


 
Todd
I've heard the same arguement, as well as its inverse. The battery choice was the decision of the system owner. I know they are more sensitive to charge/discharge abuse but I see the full charge rate last week at 52.xx V, just like day 1and I trust the Trimetric and the Sunny Islands. We're taking down the entire system to upgrade & install a 400A transfer switch so the batteries will have time to stabilize for the VOC check & cleaning. 
I guess a more accurate question would be is it good enough to properly check cell VOC and not bother with the discharge capacity check? A compromise could be cap check 12V blocks of cells instead of all 24 separately. Or is the capacity checker a waste of money.
Jim
 
 
 
 ----Original Message-----
From: re-wrenches-bounces at lists.re-wrenches.org [mailto:re-wrenches-bounces at lists.re-wrenches.org]On Behalf Of toddcory at finestplanet.com
Sent: Monday, October 04, 2010 2:23 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] Battery capacity testers

I know many on this list disagree, but   this sounds SO typical for sealed batteries. It is why I never use em...   never! If they are 5 years old, you are probably at the limit of their life.   Replace em with flooded lead calciums and your customers (and you) will be   happy for 20+ years.

my .o2

Todd



On Sunday,   October 3, 2010 9:28pm, "North Texas Renewable Energy Inc"   <ntrei at 1scom.net> said:

    
I have a customer with a   set of 24 Concord PVX-6480s that have twice failed during grid outages during   the night. No large loads are on the critical load panel and, since it's at   night when they drop to 50% dod, I'm not sure what's up with them.   I plan on cleaning and retightning all   the cable connections first to eliminate that possibility then checking   VOC of each cell.   
Eventually we'll install   a 25 kW genset but my first task is to find out the state of the batterys. The   system turns five next spring so I don't think they are near an early   death. The BOS is 2 Sunny Island 4248s   with upgraded chipsets and the charger is set to spec though that may need to   be bumped up. The only culprit I suspect is the high summer temperatures   in this unconditioned equipment room.   
Finally it may be time to   invest in a capacity tester. What brand is popular among those   Wrenches with lots of experience in diagnosing a batterys health? The   Concord DC5000 only comes in 12 & 24 V models and these are 2V cells.     
Thanks as   always  
   
  
Jim Duncan  
North Texas Renewable Energy  
486 W.N. Woody Road  
Azle Texas 76020  
  
  
NABCEP Certified Solar PV  
Installer No.31310-57  
TECL 27398  
[mailto:ntrei at 1scom.net] ntrei at 1scom.net   
817.917.0527  
[http://www.ntrei.com/] www.ntrei.com  
 


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