I'd like to suggest that Appendix J of John Wiles Suggested Practices
Photovoltaic Power Systems and the NEC be read. It provides good
instruction on how to calculate when an OCPD is needed. It is a function
of the module's Isc rating, the inverter's backfeed current capabilty,
and the module's
Dan,
My understanding has been that unless the inverter spec lists a "0 A
backfeed current" then it is conceivable that fault current from the grid
(up to the inverter OCPD) could feed a fault on the DC side, so DC fusing
would be necessary (Fronius IG Plus spec sheet, for example, states this).
S
Hey Everybody.. I got the impression that 690.9 ex. allows up to two parallel strings to be connected (thru a disconnect) to a grid interactive inverter (which does provide Ground Fault Protection).. Do I still need to protect the Array from possible inverter back feed? This particular array consis
It is still "vaporware" at this point. Rumors of a release 2nd or 3rd Q of this
year. We'll see.Midnite Solar Classic 250's are starting to ship now as are
the Apollo HV80's. From the Solar, Wind and Hydro powered office of Jeff
Oldham/Regenerative SOLutions
_
Jim,
Obviously, your latitude will make a big difference. The further north you go
the wider the summer to winter sun angle. Also, I'd want to know if that data
was taken using just I/V curves or through a controller which had MPPT
capabilities. In a real world situation with MPPT, I'm guessing
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