[RE-wrenches] Enphase IQ7A 3 phase limitations

[Jason Szumlanski]

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 <
jason at 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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