ltbighorn wrote:Row 212, no failures or other issues.
Thanks! Updated. The M250s will cross over 400 device-years within the next few months and we still have yet to record a single failure.
This week marks a year since I have experienced a failure of any of the inverters in my system: an M215IG which failed on January 25, 2017. Outside of the four failures of M190IGs (which are not properly grounded through their adapter cables) that is the only failure of an "integrated ground" fourth-generation Enphase inverter connected (properly connected using Engage) that I know about. That is after 500 total device-years of operation of M215IGs and M250s.
This week also marks 100 device-years of operation of fourth-generation Enphase inverters in my system: M190IG: 2.5 device-years, M215IG: 69.6 device-years, M250-60: 24.7 device-years, and M250-72: 3.2 device-years. Given the one failure of an M215IG, that puts the MTBF for fourth-generation inverters in my system at 100 years. The oldest fourth-generation inverter has been on my roof for a bit over 3.5 years now. Hopefully it will be many years before a few more units fail, thus establishing an accurate MTBF number for the fourth-generation inverters in this system.
By comparison, the original M190s (third generation) racked up about 249 devices-years before being replaced and experienced 6 failures over 6.8 calendar years, giving an MTBF of about 41 years. It will be about three more years before I have that much calendar- and device-time on the fourth-generation units.
Would anyone else like to provide an update on your Enphase system? TIA!