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RegGuheert
Posts: 6229
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 Apr 06, 2018 12:44 am

From the "jagged production curves" thread:
jjleejr wrote:So from the public page you can monitor and see when a micro inverter fails?
That was true until September 3, 2013. Before that date, I could gather enough information from the public pages to identify failures. On that date Enphase reduced the amount of data which was available on every system's public page. As a result, I now depend on reports from owners or friends of owners to know how many failures a given system has experienced.
jjleejr wrote:Feel free to add mine. It’s a brand new system.

John
Thanks, John! I added your system as Row 238 in the spreadsheet. Please check the details I wrote there to ensure they are correct. If you want me to keep up with your system's reliability, please drop a note into this thread occasionally and let me know how many failures you have had, even if there have been none. There is no need to do that regularly, as MTBF data accumulates very slowly. But if you do it every year or so that's fine. Please identify which row your system occupies at the time you make the report. TIA!

Congratulations on your new system!
RegGuheert
2011 Leaf SL Demo vehicle
10K miles: Apr 14, 2013, 20K miles (55.7Ah): Aug 7, 2014, 30K miles (52.0Ah): Dec 30, 2015, 40K miles (49.8Ah): Feb 8, 2017, 50K miles (47.2Ah): Dec 7, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

User avatar
RegGuheert
Posts: 6229
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Enphase field MTBF: M190: ~38 Years M215: ~460 Years M250: >300 Years

Tue Apr 24, 2018 8:26 am

RegGuheert on April 4, 2018 wrote:
RegGuheert wrote:Let's see if I can get any M190s to fail during the summertime this year.
Wow! That was fast! One of the M190s is now reporting a "Hardware Failure".

My evil plan is working! :twisted:
That one inverter had a hardware failure almost the entire first day it was back in service. None since then. These M190s with the latest firmware are much less likely to die than they used to be, but they still frequently give slightly less power than normal and report "Grid Gone" errors.

Let's see how they do this summer...
RegGuheert
2011 Leaf SL Demo vehicle
10K miles: Apr 14, 2013, 20K miles (55.7Ah): Aug 7, 2014, 30K miles (52.0Ah): Dec 30, 2015, 40K miles (49.8Ah): Feb 8, 2017, 50K miles (47.2Ah): Dec 7, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

User avatar
RegGuheert
Posts: 6229
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Enphase field MTBF: M190: ~44 Years M215: ~470 Years M250: >275 Years

Sat Jun 23, 2018 4:40 am

RegGuheert on January 26, 2017 wrote:I may have just experienced the first failure of a four-generation inverter including an integrated ground. (To my knowledge, all failures of M215s that I have recorded to date were the early ones without the "IG" suffix.) I currently have four of the latest-style fourth-generation M215IGs on my roof that include the metal case. They were built in week 45 of 2015. One of those four inverters malfunctioned yesterday. It had a dropout at about 12:30 PM with no event recorded in the log. Then at about 2:00 PM it stopped producing power. About an hour later it reported "DC Power Too Low" in the event log and did not produce any power for the rest of the day.
That was the first failure of an M215IG that I experienced and I have now had a second one fail on Wednesday of this week, June 20, 2018. This failure was also from that first group of four M215IGs which I purchased which came a metal case. (The 24 M215s I had purchased prior to those had come in plastic cases.) I will call Enphase on Monday to report this failure.

As a result of this failure, I decided to pull out those M215s in metal cases and put them into their own row (as if I didn't have enough rows in my spreadsheet for my system already!). They currently live in Row 137 of my MTBF spreadsheet. Those four inverters were put into service just two years ago, so they have a miserable MTBF of only 4 years now. That contrasts with the 12 M215IGs with plastic cases that have early 2014 date codes which I purchased from QueenBee and installed four years ago. Those have experienced no failures after 48 device-years of operation. I also have 12 more plastic M215IGs built in the middle of 2014 which have experienced no failures even though they were installed at the same time and on the same roof as the metal units. Finally, in March 2017, I installed one additional M215IG with the metal case with a date code at the very end of 2016 which has not failed. (Coincidentally, the replacement Enphase sent me for the previously-failed unit has a date code very close to the one for this unit.) In other words, the MTBF of the *plastic* M215IGs on my roof is still undetermined with over 72 device-years of service while the MTBF of the *metal* ones is (somewhat) established at only about five years.

I also have nine M250s in the plastic cases which have operated flawlessly for the past two years. But in 2017 I purchased 24 M250-72s in metal cases. Only 12 of those have been in service and only for about 5 months, so I only have about five device-years on those inverters. No failures so far.

I'm hopeful that all of my metal-can fourth-generation Enphase inverters are not as bad as that first batch of four that I purchased!

Does anyone else out their have M215IGs or M250s (either 60- or 72-cell) with metal cases on your roof?
RegGuheert
2011 Leaf SL Demo vehicle
10K miles: Apr 14, 2013, 20K miles (55.7Ah): Aug 7, 2014, 30K miles (52.0Ah): Dec 30, 2015, 40K miles (49.8Ah): Feb 8, 2017, 50K miles (47.2Ah): Dec 7, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

ltbighorn
Posts: 85
Joined: Thu Nov 05, 2015 5:24 am
Delivery Date: 08 Nov 2015
Location: SF Bay Area

Re: Enphase field MTBF: M190: ~44 Years M215: ~470 Years M250: >275 Years

Fri Jun 29, 2018 4:24 am

RegGuheert wrote:Does anyone else out their have M215IGs or M250s (either 60- or 72-cell) with metal cases on your roof?


All of my row 220 M250s have metal cases and are still operating without issue.

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