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 field MTBF: M190: ~36 Years M215: ~316 Years M250: >357 Years

Sat Jan 05, 2019 2:02 pm

Sorry to hear of your M250 failure.

Line 219 - no failures but four of the M250s have been removed and replaced with S280s in July of 2016 to take advantage of the higher power rating of the S280 with the SolarWorld 275watt modules . Number of installed M250s on that spreadsheet line is now eight.

Line 236 - no failures of the S280s attached to the Sharp 235watt modules.

Need to add another line for four S280s that are attached to the SolarWorld 275watt modules .

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

Re: Enphase field MTBF: M190: ~36 Years M215: ~316 Years M250: >357 Years

Sat Jan 05, 2019 5:53 pm

SurfHawk wrote:Line 232: No failures on my S280's.
Updated. Thanks! You now have over 25 device-years of operation without any failures.
pclifton wrote:Sorry to hear of your M250 failure.

Line 219 - no failures but four of the M250s have been removed and replaced with S280s in July of 2016 to take advantage of the higher power rating of the S280 with the SolarWorld 275watt modules . Number of installed M250s on that spreadsheet line is now eight.

Line 236 - no failures of the S280s attached to the Sharp 235watt modules.

Need to add another line for four S280s that are attached to the SolarWorld 275watt modules .

Thanks!
Thanks, pclifton! Since I do not have any installations of S280s before September of 2016, I'm wondering if your July of 2016 date is a typo. Since you provided an update in February of 2018 without a mention of this change, I am going to put your latest changes in as of July of 2018.

Please correct me if my correction is in error.

With the above changes, the overall MTBF of the M250s with one total failure now stands at 450 years. The overall MTBF of the S280s with no failures is above 154 years.
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

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

Re: Enphase field MTBF: M190: ~36 Years M215: ~316 Years M250: >357 Years

Sun Jan 06, 2019 3:08 pm

RegGuheert wrote:One more note: A second one of these early, out-of-warranty M250s is also showing signs of imminent failure. I will report here if it fails completely.
It has been sunny for the last day-and-a-half and I can see that TWO more of the remaining eight out-of-warranty M250s are failing. The failure mode is that they always produce power, but they will not produce above a certain power level. One seems limited to about 100W while the other is limited to about 120W. Over the past two days, one harvested 70% as much energy as its neighbors and the other harvested 75% as much. At that level, Enphase would consider them both failed (assuming we could get seven straight sunny days around here).

I find it very strange that three of the nine early-build M250s that I own have decided to fail within a few weeks of each other after years of proper operation. I must say that I regret purchasing these used units. Fortunately, all the other inverters I have purchased are/were new with warranty. I decided a year or so ago to purchase spares to cover these nine "just in case". I didn't expect to need them so soon!
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 field MTBF: M190: ~36 Years M215: ~316 Years M250: >357 Years

Sun Jan 06, 2019 3:25 pm

RegGuheert wrote:
RegGuheert wrote:One more note: A second one of these early, out-of-warranty M250s is also showing signs of imminent failure. I will report here if it fails completely.


Wow, that is very unusual to have so many fail in the same timespan! I was going to ask about the failure mode, but you answered that. I saw a similar failure mode on many M190s, but like you, I am very disappointed to see it in the M250s as well.

Like you, I purchased enough spares to completely replace all my inverters, except my spares are S280s. It will be interesting to see how this all plays out. BTW, you are correct, the install date for my four S280s replacing the M250s was 2018 -- sorry about that.

Respectfully,
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

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

Re: Enphase field MTBF: M190: ~36 Years M215: ~316 Years M250: >357 Years

Fri Feb 08, 2019 3:26 pm

RegGuheert wrote:I find it very strange that three of the nine early-build M250s that I own have decided to fail within a few weeks of each other after years of proper operation. I must say that I regret purchasing these used units. Fortunately, all the other inverters I have purchased are/were new with warranty. I decided a year or so ago to purchase spares to cover these nine "just in case". I didn't expect to need them so soon!
It's official. Three of the nine early-build M250s have failed, and I have updated the spreadsheet to show the failures. They failed less than five years after their manufacture date. That brings the overall MTBF of the M250s in the spreadsheet down to just 150 years.

I'm still stumped by the three nearly-simultaneous failures. I suspect electrical stress must have been involved, but that begs the question of why the other 6 inverters of that type (and the other 45 inverters of other types) did not fail due to the same stresses.

I'm not happy I purchased these 9 used inverters. OTOH, it makes me glad that all of the other units I own are still under warranty!
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

ltbighorn
Posts: 88
Joined: Thu Nov 05, 2015 5:24 am
Delivery Date: 08 Nov 2015
Location: SF Bay Area

Re: Enphase field MTBF: M190: ~36 Years M215: ~316 Years M250: >357 Years

Thu Apr 18, 2019 10:24 am

Row 226: No failures/issues with my 12 M250s as of 2019-04-18.

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