Series Parallel PV in Battery systems [RE-wrenches]

[David Brearley]

Damian,

All battery systems require series string fusing regardless of the number of
strings in parallel.  The batteries provide a source for fault currents.
The fusing is intended to protect the modules from these potential fault
currents.

David Brearley
NABCEP Certified Solar PV System Installer (TM)
 
Meridian Energy Systems
2300 S. Lamar, Suite 107
Austin, TX 78704
512-448-0055 (ph)
512-448-0045 (fax)
www.meridiansolar.com


-----Original Message-----
From: Damian de Caires [mailto:damian at thesolarcenter.com] 
Sent: Tuesday, November 21, 2006 6:11 AM
To: RE-wrenches at topica.com
Subject: Re: Series Parallel PV in Battery systems [RE-wrenches]


The purpose of fusing is to protect the internal wires of the modules.  
If the module is rated for 15amp series, or in some cases like the sharp 
167 where it is a 10amp rating.  What you need to prevent is in the 
event of a short if all the strings minus the one string that the short 
would enter into is greater than the amp series max of the module than 
you need fusing.  A battery system with 2 strings is likely not to need 
fusing if the two strings are less than the series rating of the module 
(isc x 1.56).  Battery systems in general tend to be more likely 
candidates because the wiring is high amp at low voltage
-Damian de Caires (Damian at thesolarcenter.com


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