Around here a 385W module on an IQ7+ rarely flatlines, even at optimal orientation. I was concerned that a 420W module at 208V/290W max on an IQ7A would start to be problematic, but PVWATTS disagrees.
On Wed, Mar 3, 2021, 6:14 PM Chris Worcester <[email protected]> wrote: > There’s the inverter max output amps, that’s it. 290 watts for either the > 7 a or 7+ on the 208 VAC, they’re equal for sure. So put on a 420 watt > panel but don’t expect to make a bit more production midday, all you get is > a bit quicker ramp up in the AM and a bit longer 290w output in the > evening. I’d put something in the 320 to 350 w range on these micros, max. > We are in a cooler climate too maybe than most, around the Reno Tahoe area. > I have LG 310’s on S280’s that are seeing flattening on the Enlighten > output graphs midday now in the spring. > > > > Chris Worcester > > Solar Wind Works > > NABCEP PV Installation Professional > > Cell 530-448-9692 > > www.solarwindworks.com > > [email protected] > > > > *From:* RE-wrenches <[email protected]> *On > Behalf Of *Jay > *Sent:* Wednesday, March 03, 2021 12:46 PM > *To:* RE-wrenches <[email protected]> > *Subject:* Re: [RE-wrenches] Enphase IQ7A 3 phase limitations > > > > Emphase has a white paper showing production vs module size and locations > around the country. > > > > I don’t know if it’s more accurate than pv watts but you might check it > out. > > > > Jay > > Peltz power. > > > > On Mar 3, 2021, at 12:13 PM, Jason Szumlanski < > [email protected]> wrote: > > > > I'm wondering how accurate the DC to AC ratio is when using PVWATTS. I did > a quick PVWATTS analysis at my local area using a typical commercial roof > tilt and found that using a 420W module on an IQ7A versus a 385W module on > an IQ7+ yields almost identical results. The 420W module has 1% less > annual production at to the 145% ratio compared to the 132% ratio with the > 385W module. > > > > Given that, I can't imagine why anyone would use the IQ7A versus the IQ7+ > on a 208V system. Why incur the additional cost if the AC output current is > identical for both inverters? > > > > If PVWATTS is right, I guess it's a non-issue in my local area, but it may > vary in other locations where clipping is more common. The heat here > results in little clipping at a 132% ratio here, and I guess at 145% the > morning and afternoon advantages largely outweigh the mid-day clipping > increase. > > > > Jason Szumlanski > > > > > > > On Tue, Mar 2, 2021 at 10:00 AM Jason Szumlanski < > [email protected]> wrote: > > I was surprised to learn that the IQ7A is limited to 290 W continuous at > 208 volts. That pretty much puts Enphase out of the running for light > commercial jobs with new high-powered 72 cell panels. Any thoughts on this? > > > > Jason > > _______________________________________________ > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > _______________________________________________ > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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