ltbighorn
Posts: 79
Joined: Thu Nov 05, 2015 5:24 am
Delivery Date: 08 Nov 2015
Location: SF Bay Area

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

Tue Aug 29, 2017 3:01 am

RegGuheert wrote:
ltbighorn wrote:As an side, it seems Enphase has started making Envoys only report 15-minute interval failures, down from 5-minute, as a cost saving measure. This results in stair-stepping on the Enphase graphs (and anything that pulls from their API). Very annoying. In order to get 5-minute data back I've had to switch pvoutput from API polling to pushes from my local server polling the Envoy-S. Seems silly. If they want to cost save, they should just reduce the >30 day 5-minute interval data down to 15-minutes. Tiny savings either way, but the storage cost of the long-term data is going to way outsize the last couple weeks of data.
Perhaps I am not understanding what you are saying by "only report 15-minute interval failures, down from 5-minute" as all my data is still available in 5-minute intervals.


Hmm "failures" must have been a cut and paste error. Enphase has been transitioning customer Envoys to only report at 15-minute intervals, reduced from the previous 5-minute intervals. It seems to be a gradual rollout, as different people get converted at different times. I was about 1-2 months after the first user reports I saw, and I've seen others report being switched 4-6 weeks after I was.

A couple users have reported getting Enphase Support to switch them back (I had zero luck with that), but at least some of those have reported that it only lasted a short while and they were converted by to 15-minute reporting intervals again within a few weeks.

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RegGuheert
Posts: 5513
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 Aug 29, 2017 3:59 am

ltbighorn wrote:Enphase has been transitioning customer Envoys to only report at 15-minute intervals, reduced from the previous 5-minute intervals. It seems to be a gradual rollout, as different people get converted at different times. I was about 1-2 months after the first user reports I saw, and I've seen others report being switched 4-6 weeks after I was.

A couple users have reported getting Enphase Support to switch them back (I had zero luck with that), but at least some of those have reported that it only lasted a short while and they were converted by to 15-minute reporting intervals again within a few weeks.
Thanks! That makes sense. Perhaps its time for me to unplug my Envoy from the internet. Of course I'll need it fairly soon to commission the new M250s.
RegGuheert
2011 Leaf SL Demo vehicle
2011 miles at purchase. 10K miles on Apr 14, 2013. 20K miles (55.7Ah) on Aug 7, 2014, 30K miles (52.0Ah) on Dec 30, 2015, 40K miles (49.8Ah) on Feb 8, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

ltbighorn
Posts: 79
Joined: Thu Nov 05, 2015 5:24 am
Delivery Date: 08 Nov 2015
Location: SF Bay Area

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

Wed Aug 30, 2017 6:29 pm

RegGuheert wrote:Thanks! That makes sense. Perhaps its time for me to unplug my Envoy from the internet. Of course I'll need it fairly soon to commission the new M250s.


If you don't have your own separate metering (or Envoy-S CT-based metering) and get your data by polling the Envoy's 5-minute (soon to be 15-minute) values, and don't care about the Enlighten/API values, then yeah, that might make sense.

Since I have an Envoy-S w/CT metering, I at least have an alternative post-update (note: the firmware version did not change, no outward sign of any updates) way of getting the 5-minute data I want, otherwise I'd be much more upset.

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RegGuheert
Posts: 5513
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

Thu Aug 31, 2017 5:30 am

ltbighorn wrote:
RegGuheert wrote:Thanks! That makes sense. Perhaps its time for me to unplug my Envoy from the internet. Of course I'll need it fairly soon to commission the new M250s.
If you don't have your own separate metering (or Envoy-S CT-based metering) and get your data by polling the Envoy's 5-minute (soon to be 15-minute) values, and don't care about the Enlighten/API values, then yeah, that might make sense.

Since I have an Envoy-S w/CT metering, I at least have an alternative post-update (note: the firmware version did not change, no outward sign of any updates) way of getting the 5-minute data I want, otherwise I'd be much more upset.
I decided to not disconnect the cable from the internet because that would prevent me from accessing the Envoy through the web interface. Instead, I used my router to block the Envoy from making outgoing connections through the router. This looks just like the internet is down to the Envoy since it cannot tunnel into the mothership. (FWIW, I unblocked UDP port 53 so it could FIND Enphase, but it then is blocking TCP port 443 (https).)

Hopefully this will allow the Envoy to continue to collect data from the inverters every five minutes. I'm thinking I might be able to upload data intermittently without getting the setting change. But what I don't know is whether the servers just wait for the Envoy to connect and then immediately provide the new settings.

Thanks for the heads up on this, guys. We'll see what happens...
RegGuheert
2011 Leaf SL Demo vehicle
2011 miles at purchase. 10K miles on Apr 14, 2013. 20K miles (55.7Ah) on Aug 7, 2014, 30K miles (52.0Ah) on Dec 30, 2015, 40K miles (49.8Ah) on Feb 8, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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RegGuheert
Posts: 5513
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

Mon Sep 11, 2017 9:25 am

RegGuheert wrote:In spite of the fact that I have experienced one failure of a fourth-generation inverter in the past year and zero failures of the third-generation M190s, I decided to fully divest myself of M190s. I just purchased 12 new 72-cell M250s on eBay for $90 each shipped. This is the cheapest price I have ever paid for ANY Enphase inverters, new or used. These new inverters will replace the 12 M190s that are each connected to pairs of 72-cell, 120W PV modules in the field.

With this change, I expect to see a marginal increase in production in the wintertime since the old inverters spent much of their time saturated at 199W during the cold weather. The bigger benefit of this upgrade is the extension of the warranty period from ending at the close of 2025 to ending in 2042. The field array currently produces about $400-worth of electricity each year. I expect that in 2026, that amount of electricity will be worth about $600, if not more. In 2042, I expect that amount of electricity will be worth at least $800. As such, I expect today's $1080 investment to return about $12,000 between the years 2026 and 2042. If they last longer than that or if electricity gets more expensive than that, it will just be more gravy.
The 12 new M250-72s arrived in great condition in their original packaging on Saturday. The date codes on these inverters are very recent: Week 25 of 2017.

Given the recent date codes and the fact that I purchased these units to extend my warranty coverage on the field array, it makes no sense for me to install them right now. The reason is that Enphase starts the warranty period on the earlier of the date of installation or four months after the product is shipped from their factory. So I will wait until at least late October to install these new units to ensure the warranty runs for as long as possible.

Who knows? Maybe I can even get another M190 failure or two before that time.
RegGuheert
2011 Leaf SL Demo vehicle
2011 miles at purchase. 10K miles on Apr 14, 2013. 20K miles (55.7Ah) on Aug 7, 2014, 30K miles (52.0Ah) on Dec 30, 2015, 40K miles (49.8Ah) on Feb 8, 2017.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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