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drees
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Re: AZ: Canary in the coalmine for microinverters, too?

Sun Apr 21, 2013 4:38 pm

RegGuheert wrote:The hottest inverter is under a panel in the top row of the garage, third from the right.
Right - I have theorized with another Enphase user that making sure the attic is adequately vented or otherwise keeping the attic cool would also reduce the temperature of the panels/inverters.

Attics get darn hot - they can easily get to 140F in the summer and it will also be hottest higher on the roof. So not only are the inverters getting cooked from the top, but they also get cooked from the bottom.

It would be interesting to toss up a few batts of R13 fiberglass under a couple columns of panels to see if it made a measurable difference in inverter temperatures.
'11 LEAF SL Powered By 3.24 kW Enphase Solar PV

FairwoodRed
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Re: AZ: Canary in the coalmine for microinverters, too?

Tue Apr 23, 2013 4:20 pm

RegGuheert wrote:I have been tracking field failures of Enphase microinverters for a while now by watching the public sites for many of our arrays to try to spot the signature of microinverter replacements. So far, I have accumulated over 1200 device-years of operation and see a total of 4 failures in the field, including one of my own. That gives an MTBF of over 300 years.
...
If you have an Enphase-based array which is not included on this spreadsheet, please post your URL here and I will add it.


I have an Enphase array that is just outside of Seattle. The link is https://enlighten.enphaseenergy.com/public/systems/EPbL26487

Thanks to your posts, I was able to find that my browser was missing a plugin and I can now see inverter temps. I'm sure I'll have fun watching those this summer.

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TonyWilliams
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Re: AZ: Canary in the coalmine for microinverters, too?

Tue Apr 23, 2013 4:44 pm

Ok, I can not find my inverter temps. Where should I look?

I do like this:


24.8MWh
101% of estimate

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ecoobsessive
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Re: AZ: Canary in the coalmine for microinverters, too?

Tue Apr 23, 2013 6:14 pm

Edit: nevermind, I found it. That's scary. It hasn't even been hot here lately and the inverter temps are already up to 120 F.

(I want to know, too. I only see where it tells the outside temp. for my neighborhood.)
Martha
Red SL + QC (hoping to have a QC in SA some day)
solarpowered by 5.52 kW PV with unreliable Enphase microinverters

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Re: AZ: Canary in the coalmine for microinverters, too?

Tue Apr 23, 2013 9:36 pm

I'm going to go up on our roof in the heat of the summer with my temp gun and get some MI readings.
2013 LEAF SV Del. 2/28/13
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drees
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Re: AZ: Canary in the coalmine for microinverters, too?

Tue Apr 23, 2013 11:36 pm

FairwoodRed wrote:I have an Enphase array that is just outside of Seattle. The link is https://enlighten.enphaseenergy.com/public/systems/EPbL26487
Wow, the disparity between summer and winter production is amazingly large for your system - 93 kWh on a sunny day in the summer compared to 10 kWh on a sunny day in the winter.

Do you panels get a good amount of shade in the winter or something?
'11 LEAF SL Powered By 3.24 kW Enphase Solar PV

FairwoodRed
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Re: AZ: Canary in the coalmine for microinverters, too?

Wed Apr 24, 2013 10:22 am

Indeed I do have a lot of shading from Oct thru Mar. But a larger factor is the sun available to me during the winter. PV Watts shows that in Dec I should expect 14% of what I get in July for South facing panels. My roof wasn't large enough, so I choose to accept the reduced output and mounted panel North, East, and West too. Accounting for orientation, PV Watts shows I should get 10% in Dec vs July. Interesting side note: My East panels make 95%, and North panels 80%, of my South panels over the year.

And then there is the shading. I was really concerned about it early on. But as I worked thru my production estimates, I came to realize that the fall/winter/spring shading would only reduce my production by 1000 kWh a year ($100) because of the lack of available winter sun. I decided that I liked those trees more than I wanted maximum production and I left them as is.

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RegGuheert
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Re: AZ: Canary in the coalmine for microinverters, too?

Wed Apr 24, 2013 2:16 pm

TonyWilliams wrote:Ok, I can not find my inverter temps. Where should I look?
You cannot get the temperatures from the public site, so you need to log in to your private site at https://enlighten.enphase.com . Once you are logged in, click the "Graph" tab and then near the top left click one of the Power graphs (Today, Last 7 Days or Custom). I used the Custom range so that I could hunt down the hottest day. Once you have a power graph up, you can turn on or off any of: Power Produced, DC Voltage, DC Current, AC Voltage, AC Frequency or Temperature. Unfortunately, as noted, you cannot get a Y-axis scale for anything except Power Produced. But you can hover over the curves to get the values from them.

Anyway, it's not obvious how to get the data, but it is there.

Please let us know what you see.
TonyWilliams wrote:I do like this:

24.8MWh
101% of estimate
Yes, your system produces well! It is exactly 5/6 the size of ours (assuming the same panel power) and the two systems produce nearly exactly the same energy over the course of a year.

Mine does not show it making 100% of our lifetime projection since we had a 5-month outage at the beginning of life, but it exceeds the estimates since that time. Right now, our lifetime is only 85% of estimate, but our month-to-date is 124% of estimate. It's been a good month so far!
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

QueenBee
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Re: AZ: Canary in the coalmine for microinverters, too?

Wed Apr 24, 2013 2:31 pm

RegGuheert wrote:Mine does not show it making 100% of our lifetime projection since we had a 5-month outage at the beginning of life, but it exceeds the estimates since that time. Right now, our lifetime is only 85% of estimate, but our month-to-date is 124% of estimate. It's been a good month so far!


I wish we had better control of how that percent is calculated. My lifetime is now 37% of estimated :(

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RegGuheert
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Re: AZ: Canary in the coalmine for microinverters, too?

Wed Apr 24, 2013 3:30 pm

FairwoodRed wrote:I have an Enphase array that is just outside of Seattle. The link is https://enlighten.enphaseenergy.com/public/systems/EPbL26487
Thanks! I have added it to my spreadsheet. Please verify that all of the information is correct for your system.
FairwoodRed wrote:Thanks to your posts, I was able to find that my browser was missing a plugin and I can now see inverter temps. I'm sure I'll have fun watching those this summer.
Yes, it should be interesting. You can look back at the last two summers by picking a custom 7-day range from then.
ecoobsessive wrote:Edit: nevermind, I found it. That's scary. It hasn't even been hot here lately and the inverter temps are already up to 120 F.

(I want to know, too. I only see where it tells the outside temp. for my neighborhood.)
_________________
Martha
Red SL + QC (hoping to have a QC in SA some day)
-1 battery capacity bar but still more electric miles than a Volt
solarpowered by 5.52 kW DC PV
https://enlighten.enphaseenergy.com/pub ... /kKKv21338
Martha, I added your system from your signature, also. Can you also verify that the entry is correct in my spreadsheet? TIA!
RegGuheert
2011 Leaf SL Demo vehicle
10K mi. on 041413; 20K mi. (55.7Ah) on 080714; 30K mi. (52.0Ah) on 123015; 40K mi. (49.8Ah) on 020817; 50K mi. (47.2Ah) on 120717; 60K mi. (43.66Ah) on 091918.
Enphase Inverter Measured MTBF: M190, M215, M250, S280

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