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

Posted: Wed Sep 05, 2018 9:30 am
by philip
Line 222, no failures to report.

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

Posted: Wed Sep 05, 2018 5:14 pm
by iPlug
Lines 208 and 224, no failures to report.

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

Posted: Sat Sep 08, 2018 5:16 am
by RegGuheert
Thanks, guys!
philip wrote:Line 222, no failures to report.
Updated. Your measured MTBF now exceeds 64 years with no failures.
iPlug wrote:Lines 208 and 224, no failures to report.
Your MTBF is now above 190 years with no failures. 170 of your device-years are with the original M215s, which I believe contain third-generation electronics (M190-like) even though they are officially fourth-generation inverters.

The M250s are currently well-established as the clear leaders in terms of reliability amongst Enphase' microinverter line, currently at 431 device-years with no failures reported.

We don't have enough data from the S280s and IQ-series inverters to have any idea about their reliability. I'm not sure we ever will have enough. Even with the M250s, since we do not have any failures recorded, we are a long way from establishing their MTBF with any accuracy.

Interestingly the measured MTBFs of the different types of inverters in my system are around the same value right now:
M190s: 42 years (based on 6 failures)
M215IGs: 46 years (based on 2 failures)
M250s: >38 years (no failures so far)

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

Posted: Sat Sep 08, 2018 10:07 am
by DaveEV
Somewhat related to MTBF, Enphase is offering an upgrade program for "legacy" Enphase owners to upgrade to IQ 7 or IQ 8 when it's released.

Enphase states on the page that the latest generation inverters are an order of magnitude more reliable than earlier ones.

https://go.enphase.com/upgrade/installers

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

Posted: Sat Sep 08, 2018 3:34 pm
by RegGuheert
drees wrote:Somewhat related to MTBF, Enphase is offering an upgrade program for "legacy" Enphase owners to upgrade to IQ 7 or IQ 8 when it's released.

Enphase states on the page that the latest generation inverters are an order of magnitude more reliable than earlier ones.

https://go.enphase.com/upgrade/installers
Interesting. It looks like it is for second-generation inverters, which I believe is the M170s. I have not been tracking failures of those inverters. I wonder if those are having problems with failure rate or if they are going out of warranty sometime soon.

I also wonder if Enphase is trying to find someone to purchase the non-"plus" versions of their newest inverters.

I will say that Enphase certainly has enough data to calculate an MTBF on their new inverters. That said, they do NOT have enough YEARS on their new inverters to know whether there is something that will cause their lives to be shorter than the necessary 30 years or so needed to avoid massive warranty replacements. That's true of all their inverters, but it is more true with the IQ series units.

BTW, drees, can I put you down for no failures in your system?

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

Posted: Sat Sep 08, 2018 6:30 pm
by wwhitney
RegGuheert wrote:[It looks like it is for second-generation inverters, which I believe is the M170s.

Per the FAQ at the bottom of the page, it is for M190, M210, D380, and M175 inverters.

Cheers, Wayne

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

Posted: Sun Sep 09, 2018 12:19 pm
by RegGuheert
wwhitney wrote:Per the FAQ at the bottom of the page, it is for M190, M210, D380, and M175 inverters.

Cheers, Wayne
Thanks, Wayne! It's interesting that they don't call that set "second- and third-generation microinverters".

In any case, I'm interested! I have 12 M190s operating right now and I could swap in the other M190 spares long enough to get through the upgrade if desired.

I'm particularly interested in Option 1 and Option 3, but the following questions arise:

Q1) Given they require "Company Name", can I sign up for this as a self-installer?
Q2) If I choose Option 1, can I self-install? (I'm guessing I could since they say the homeowner makes the purchase and the equipment is sent to the homeowner.)
Q3) If I choose Option 3, can I self-install? (I'm guessing not, but I don't know.)
Q4) If I choose any of the options, will the new IQ Envoy communicate with the M215IGs and M250s that would still be in the system? (Not a big issue since I could simply run two Envoys.)
Q5) Since I don't have to send the old equipment back to Enphase, can I just resell the new equipment?
Q6) How much will Options 2 and 3 cost?

That's enough for now. I suppose we will learn more as time goes on.

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

Posted: Sat Oct 13, 2018 3:01 pm
by ltbighorn
Row 221 M250s, still no issues as of Oct 13 2018.

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

Posted: Tue Jan 01, 2019 3:49 pm
by RegGuheert
I replaced my first M250 today. Unfortunately, this one was NOT under warranty, so that was on me. Perhaps I will take it apart and see what I find inside. (Unfortunately, that will be mostly potting epoxy which I am not quite sure how to deal with.) This M250 was one of the very first ones Enphase built. It has a date code of week 48 of 2013 and has the "bent" metal plate left over from the original M215s. It has only been in my system for about 2.5 years, but it has probably operated for a total of 4 years or so.

Now that I have a failed M250 to go with my failures of other types, this brings me to interesting MTBF results for the various microinverters found in my system (ignoring all data from other systems covered in the spreadsheet):

M190s: 42 devices, 256 device-years with 6 failures: MTBF = 43 years
M190IGs: 3 devices, 4 device-years with 0 failures: MTBF = Unknown
M215IGs: 29 devices, 94 device-years with 2 failures: MTBF = 47 years
M250s: 25 devices, 44 device-years with 1 failure: MTBF = 44 years

(Note: I also have 12 more M250s as cold spares which have never been installed in my system.)

Frankly, it is a very big surprise to me to see the MTBF of the M190s, M215IGs, and M250s all grouped closely together right around 45 years. Does anyone else find this odd? Of course this result does not match the overall MTBFs for these types of devices, but I wonder if this is where they might all be headed eventually.

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.

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

Posted: Sat Jan 05, 2019 11:39 am
by SurfHawk
Line 232: No failures on my S280's.