Series Parallel PV in Battery systems [RE-wrenches]

[William Miller]

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Friends:

We have all learned that in grid-tie systems, string quantities of two or 
less do not require series fusing (and in some cases, string quantities of 3).

I am wondering if that holds true for battery based 
systems.  Specifically,  if I have two series strings of modules, can I 
connect them together without fuses?

How about if I have multiple pairs of strings?  Can two series string 
groups be connected with fuses only between the groups of two strings?

I have drawn a block diagram and, in this scenario, the two strings hard 
wired together are all protected from external fault current by the 
properly sized string fuse.


Comments?

William Miller




__________________________________________________________________
William Miller
Miller Power and Communications
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email: wrmiller at mpandc.com
http://mpandc.com
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