[RE-wrenches] Enphase IQ7A 3 phase limitations

[Chris Worcester]

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

chris at solarwindworks.com

 

From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of Jay
Sent: Wednesday, March 03, 2021 12:46 PM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
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 <jason at floridasolardesigngroup.com <mailto:jason at floridasolardesigngroup.com> > 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

 

 


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On Tue, Mar 2, 2021 at 10:00 AM Jason Szumlanski <jason at floridasolardesigngroup.com <mailto: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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