[RE-wrenches] Strings and series of batteries

Darryl Thayer daryl_solar at yahoo.com
Thu Dec 3 12:16:25 PST 2009


Are they three cells in parrallel or are they one big cell?

--- On Thu, 12/3/09, Brian Teitelbaum <bteitelbaum at aeesolar.com> wrote:

> From: Brian Teitelbaum <bteitelbaum at aeesolar.com>
> Subject: Re: [RE-wrenches] Strings and series of batteries
> To: "RE-wrenches" <re-wrenches at lists.re-wrenches.org>
> Date: Thursday, December 3, 2009, 2:11 PM
> 
> 
> 
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> #yiv1990029547 p.MsoNormal
> 	{margin-left:3.0pt;}
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> Hi Jamie, 
> 
> Have you seen any change in
> cycle life by having the three cells
> in the L16 connected in parallel instead of series? Just a
> question that has
> been on my mind for a while. 
> 
> Brian Teitelbaum 
> 
> AEE Solar 
> 
>    
> 
> 
> 
> 
> 
> From:
> re-wrenches-bounces at lists.re-wrenches.org
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] On
> Behalf Of James
> Surrette
> 
> Sent: Thursday, December 03, 2009 12:02 PM
> 
> To: RE-wrenches; jryago at netscape.com
> 
> Subject: Re: [RE-wrenches] Strings and series of
> batteries 
> 
> 
> 
> 
> 
>    
> 
> Hi
> Jeff,  
> 
> 
>   
> 
> Not
> to plug but we (and some other vendors) have 2V L-16's
> on offer.  So you
> can get 1000AH (C/20) in a series string in this more
> manageable size.  
> 
> 
>   
> 
> Regards,
>  
> 
> 
>   
> 
> Jamie
> 
> 
> 
> 
> 
> James Surrette
> 
> 
> 
> Surrette Battery Co. Ltd
> 
> 1 Station Rd.
> 
> Springhill, NS, CAN
> 
> B0M 1X0
> 
> 
> 
> Direct: 902.597.4027
> 
> Fax: 902.597.8447
> 
> 
> 
> 
> 
> 
> 
> 
> 
> >>> "Jeff Yago"
> <jryago at netscape.com> 12/3/2009 1:16
> PM >>>
> 
> 
> 
> Boy, this string on strings and series of strings is
> starting to string into a
> very long list of string related emails!
> 
> 
> 
> We also avoid multiple strings of batteries, but sometimes
> this is required to
> get the right combination of system voltage and amp-hour
> capacity.  We
> also agree that 3 or more strings is not good, and we have
> seen many cases
> where one string stays much less charged than the other
> strings on older
> systems as terminals corrode and individual battery cell
> conditions start to go
> south. 
> 
> 
> 
> However, for safety reasons we install a catastrophic
> in-line fuse in each
> separate string that is sized to help prevent a
> "melt-down" when one
> string tries to dump into another string that has a failed
> battery or shorted
> cell.   Not sure how fail-safe this is and would
> not protect against
> small amp flows between strings due to battery temperature
> differences, but
> feel its better than nothing.  
> 
> 
> 
> I also point out that for remote off-grid installations you
> sometimes have to
> use smaller and easier to handle L-16 size batteries, as
> its hard to pack in
> several one-ton tray batteries with no roads using a gater,
> so this means you
> still need multiple strings of batteries in parallel.
> 
> 
> 
> Jeff Yago
> 
> 
> 
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