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RegGuheert
Posts: 6419
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Enphase M190/M190IG/M215IG/M250 Head-to-head-to-head

Mon Oct 26, 2015 7:21 am

pclifton wrote:Perhaps you can educate me about this:
Since the field array contains 72-cell PV modules (in a climate which gets cold enough to break the new-style inverters), I will need to keep the original-style inverters out there as long as possible.
I have 31 Sharp 235W mono panels as well as some 375 SW. Twenty-four of the Sharps are connected to the M190s. As you know, two of my four replacements have been the M190IG(s). I have been considering replacing all of the M190s with the new S230(s) when they are out at some point. I installed my systems and as the years go by I will reach a point where I can't keep swapping out inverters. I ran into that last year while I was blind.

Anyway, your statement gives me some concerns about that plan -- if I understand you correctly...
The issue has to do with the Maximum Input DC Voltage. That is the second specification listed in the comparison table I created for the various Enphase microinverters. As you can see, the M190s are rated for 56 V DC while most of the others, including the new S230 and S280, are rated for 48 V. The original M215 (non-IG) is the oddball, at only 45 V.

The issue with 72-cell panels is that their open-circuit voltage exceeds 48 V at temperatures below about -5F (IIRC). If that happens during the life of the non-M190 microinverters, catastrophic failure could occur.

Sharp 235-W mono panels are exactly what I have on my roof and they are no problem, since they are 60-cell panels. But I have 72-cell panels connected to 12 microinverters in the field array.

I guess I'm wondering why you would want to upgrade. As you can see from my data above, there is NO difference in production between the different inverters when coupled with the Sharp 235-W modules. There will be VERY slight differences in the wintertime, but that will be even less of an issue in your warmer climate. Are you just tired of replacing the M190s?

FWIW, I have 9 M250s for sale that I recently acquired. They're used, so they have no warranty, but I'll give you a good deal if you are interested.

One final note: It seems the S230 will NOT connect to your existing Envoys. If you purchase them, you will need to upgrade the Envoy(s) to which you intend to connect them.
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

pclifton
Posts: 62
Joined: Thu Jan 26, 2012 4:51 pm
Delivery Date: 28 Jan 2012
Leaf Number: 17731
Location: Salisbury, NC
Contact: Website

Re: Enphase M190/M190IG/M215IG/M250 Head-to-head-to-head

Mon Oct 26, 2015 5:49 pm

Thanks RegGuheert.

That answers my question regarding the 72 cell module situation.
I guess I'm wondering why you would want to upgrade. As you can see from my data above, there is NO difference in production between the different inverters when coupled with the Sharp 235-W modules. There will be VERY slight differences in the wintertime, but that will be even less of an issue in your warmer climate. Are you just tired of replacing the M190s?
Last year I was blind and could not see Enlighten to know that I had a failed inverter. Even after my transplants, I could not lift over 5 pounds for a month, so it was quite a while before I was able to swap out a failed M190. Moving forward, I would like to make my system as reliable as possible, and all bets are off regarding the remaining M190s.

I do understand about the Envoy. If I go the S230 route the Envoy-S was part of the plan.

I will keep the M250s in mind. I may PM you.

Thanks again,
Ken Clifton
2 PHEVs Powered by 10.2 kW Solar
Topaz Blue 2013 Chevy Volt and Silver 2014 Chevy Volt
Traded My Ocean Blue 2012 LEAF SL on 2-2013
Wife Traded Her Cayenne Red 2012 LEAF SL on 11-2013
Web site: http://www.kenclifton.com

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