This is something I think about regularly. I guess I don't have a good answer. I will be interested to hear what the more veteran installers have to say. My climate (-50F regularly during the winter) is much different than yours however.
To add to the question, how does climate change your answer, or does it? Jesse Sent from my iPhone > On Aug 25, 2014, at 6:40 PM, Jason Szumlanski <[email protected]> wrote: > > I had a tough customer recently that grilled me on how we can put a 270W > solar module on a 215W inverter. Fortunately, Enphase has a wonderful white > paper on the subject. However, it got me thinking... Enphase has demonstrated > that higher output panels in many climates (hot SW Florida included) can > benefit from modules that far exceed the inverter rating, and even exceed the > inverter's "recommended input" rating. Enphase has shown that 270W+ modules > can show energy harvest on the M215 where it makes sense to "oversize" the > module. > > I also received a similar query from a rather uninformed plan reviewer in an > area AHJ along similar lines. Fortunately I was within the "recommended > input" rating on the spec sheet of 270W with a 265W module, but I wonder what > would happen if I had paired the M215 with a 280W module on my plans, which > are becoming readily available now in 60 cell modules with 300W modules on > the near horizon. I'm pretty sure my plan would have been kicked back for > exceeding the manufacturer's recommendation. > > My question, which applies to string inverters and microinverters, is how > much is too much, what would happen if you paired an array that far exceeded > the rating, and how do inverter manufacturers determine the recommended > and/or maximum rating of the connected module or array? Also, why do some > manufacturers have a simple recommendation while others have a "maximum" > rating? > > > Jason Szumlanski > Fafco Solar > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org >
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