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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 drees
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.