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 < ja...@floridasolardesigngroup.com> 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 >
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