It depends on climate, orientation, and other factors. Here it is really hot almost all the time. We rarely experience anything close to the max power rating of a module here. If the orientation isn't ideal, that's another argument for oversizing. Around here we use 385 and 390W 72-cell modules on the 290W IQ7+ and rarely see clipping that would outweigh the advantages and cost-efficiency. Incidentally, early indications from some low temp coefficient 360W modules show that they do quite well compared to 385W modules with more standard coefficients this time of year. I need more data on that to make a real assessment. And modules with low temp coefficients tend to be pricey.
I am very comfortable with 1.3x - 1.4x here in Southwest Florida using standard modules. Elsewhere I would expect the ratio to be somewhat lower. I have no justification for the IQ7A here at this time. P.S. My CED Greentech rep shared some Helioscope data using the IQ7 (not plus) and 360W 120-half-cell REC Alphas. There is only a marginal advantage to using the IQ7+ over the IQ7 in that scenario here. I still opt for the IQ7+ since it is marginally better when considering cost and performance and it is more compatible/flexible. Since it's the same max quantity per string, I don't see the point in dropping to the IQ7 for the price difference. Jason Szumlanski Florida Solar Design Group On Sat, Oct 3, 2020 at 8:08 PM Jay <[email protected]> wrote: > Hi all > > For those working with Enphase. > How hard are people recommending pushing the DC/AC ratio? > > Enphase has some pretty convincing data that even a 400 watt module on a > 240watt inverter has very small clipping vs annual production > > Given that why would i recommend to a customer the IQ7A at 360va and quite > a bit more expensive vs the 240va IQ7? > Location would have something to do of course, tilt, yes. > But it seems that unless you’re installing a really large module or their > data is wrong, I’m not sure I see the advantage of the larger inverter? > > I’m hoping there will be some counter views. > > Thanks > Jay > Peltz power. > > > _______________________________________________ > 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 > <https://mailtrack.io/trace/link/1e66ec6cd3b2747d2145aba8ea9326b4f61101d7?url=http%3A%2F%2Flists.re-wrenches.org%2Foptions.cgi%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=a99335d33726bdea> > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > <https://mailtrack.io/trace/link/295d53353b27ec5f999b79c92fed393ce3ee3d70?url=https%3A%2F%2Fwww.mail-archive.com%2Fre-wrenches%40lists.re-wrenches.org%2F&userId=1613865&signature=481e602a701a1f2a> > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > <https://mailtrack.io/trace/link/2409c8d017e08bd3b3011f0117e0b14d16af76d7?url=http%3A%2F%2Flists.re-wrenches.org%2Fpipermail%2Fre-wrenches-re-wrenches.org&userId=1613865&signature=74569fb32f8d3170> > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > <https://mailtrack.io/trace/link/3c8d7e6368cee6b21623eb110c8b5ade898c77bd?url=http%3A%2F%2Fwww.re-wrenches.org%2Fetiquette.htm&userId=1613865&signature=86bce5644a4e9223> > > Check out or update participant bios: > http://www.members.re-wrenches.org > <https://mailtrack.io/trace/link/0f27f65d0c6f272a58e07c51a8dbca7e3c32934d?url=http%3A%2F%2Fwww.members.re-wrenches.org&userId=1613865&signature=8a0f4d03dd25c310> > >
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