[RE-wrenches] Inverters Maximum Input Ratings

[Jerry Shafer]

Why dont you use the m250 anyway as the 250's so far are more reliable then
the 215 have been. A little off topic i know.
On Aug 25, 2014 1:41 PM, "Jason Szumlanski" <jason at fafcosolar.com> 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​
>
>
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