[RE-wrenches] String Combiners for a-Si modules

[Dave Click]

Peter-

Appendix J of "PV and the NEC" covers this, too; as Kirpal said, you'll 
need to know the series fuse rating for the module first, though.
http://www.nmsu.edu/~tdi/pdf-resources/pdf%20version%20divided%20PV:NEC/APPENDIX%20J.pdf


-------- Original Message --------
Subject: Re: [RE-wrenches] String Combiners for a-Si modules
From: Peter Parrish <peter.parrish at calsolareng.com>
To: 'RE-wrenches' <re-wrenches at lists.re-wrenches.org>
Date: 2009/7/21 20:51

> EPV Solar EVP-54
> 
> The Isc is 1.49 A
> 
> The cut sheet does not list a series fuse rating for the module.
> 
> But it does say something about being able to use up to 8 in parallel 
> without external protection.
> 
> I am in the hunt for installation instructions.
> 
>  
> 
> - Peter
> 
>  
> 
>  
> 
> 
>  
> 
> Peter T. Parrish, Ph.D., President
> California Solar Engineering, Inc.
> 820 Cynthia Ave., Los Angeles, CA 90065
> CA Lic. 854779, NABCEP Cert. 031806-26
> peter.parrish at calsolareng.com <mailto:peter.parrish at calsolareng.com> 
> Ph 323-258-8883, Mobile 323-839-6108, Fax 
> 323-258-8885                                                               
>                                     
> 
>  
> 
> ------------------------------------------------------------------------
> 
> *From:* re-wrenches-bounces at lists.re-wrenches.org 
> [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *Kirpal 
> Khalsa
> *Sent:* Tuesday, July 21, 2009 3:11 PM
> *To:* RE-wrenches
> *Subject:* Re: [RE-wrenches] String Combiners for a-Si modules
> 
>  
> 
> Peter...depending on the series fuse rating you might be able to get 
> away with more strings in parallel before series fusing is 
> required........what panels are they and what is the series fuse rating 
> of the modules?
> Fronius has a white paper explaining when series fusing is required and 
> when you can get by without.......it all relates to series fuse rating 
> and Isc......the higher the series fuse rating and the lower the Isc the 
> more strings you can parallel with out adding series fusing........
> -- 
> Sunny Regards,
> Kirpal Khalsa
> NABCEP Certified Solar PV Installer
> Renewable Energy Systems
> www.oregonsolarworks.com <http://www.oregonsolarworks.com>
> 541-218-0201 m
> 541-592-3958 o
> 
> On Tue, Jul 21, 2009 at 2:44 PM, Peter Parrish 
> <peter.parrish at calsolareng.com <mailto:peter.parrish at calsolareng.com>> 
> wrote:
> 
> We are doing an engineering design for a large scale PV ground mount system
> based on a-Si modules. Since the Isc of the modules is 1.5 A, instead of 7-8
> A of typical c-Si modules, are there special low-current combiners out
> there? Does each string need an overcurrent protection device? Any help with
> a-Si based system design would be greatly appreciated.
> 
> 
> Peter T. Parrish, Ph.D., President
> California Solar Engineering, Inc.
> 820 Cynthia Ave., Los Angeles, CA 90065
> CA Lic. 854779, NABCEP Cert. 031806-26
> peter.parrish at calsolareng.com <mailto:peter.parrish at calsolareng.com>
> Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
> 
> 
> 
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