M-C branch plugs: Legal? Safe? [RE-wrenches]

[Mick Abraham]

Thanks to all who have replied...very helpful...

John Berdner: Thanks for reminding me about grid-tie situations where PV 
string fuses are not needed. My present application is a battery based 
system where I must consider possible backfeed from the battery.

"Ray Walters wrote: "...you can't use those connectors to create more 
than 2 parallel strings, so I'm not sure how you would parallel 3 
strings."

Mick says: On page 13 of the M-C catalogs for SolarLine 1 and SolarLine 
2, they show trios plugged together in parallel. The M-C drawing looks 
nice but one must wonder if plugged trios are really workable in the 
real world, because that would need a PV module where the series fuse 
rating is almost four times greater than the short circuit amperage.

Ray's mention that the Solar World 165s have a series fuse rating of 15 
amps is most interesting, since their short circuit amperage is a much 
lower 5.1. With the fuse rating so high relative to its amperage, this 
module seems especially well suited to plug-parallel...in pairs at 
least. 

Thanks again,

Mick Abraham, Proprietor
www.abrahamsolar.com


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