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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

Tue Feb 27, 2018 2:02 pm

SurfHawk wrote:Row 221 still going strong with no failures on my 12x S280 inverters.
Thanks, SurfHawk! Updated.

That brings the total number of device-years for all S280s up to 86 with no known failures. So far so good!

The M250s are the current MTBF leaders. They are approaching 400 years with no known failures. The oldest units are nearly four years old. By that point, many M190s were already starting to fail.

pclifton has told me separately that he has a friend who owns many M215s as well as many M250s. He reports that quite a few M215s have failed, but only one M250. Unfortunately, I am unable to add that data into my database since I do not have any visibility of it. It's fine, since we are accumulating more and more data as time goes on.
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

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