User avatar
DNAinaGoodWay
Gold Member
Posts: 2598
Joined: Mon Dec 17, 2012 1:43 am
Delivery Date: 03 Dec 2012
Leaf Number: 23156
Location: Central Massachusetts

Re: Our solar production

Mon Jan 09, 2017 6:25 pm

Wet and sunny? You must have that ideal of rain mostly at night. I'd like that.

Last year was the first time we produced more power than we used, but just barely. Made 9610 kWh, used 9603. That surprised me.
'12 SL last reading @ 2 yr, 22k, 260 GIDs, 62.35 Ahr

'15 SV w/QC, Mfd 5/14, Leased 8/14, 292 GIDs, 64.38 Ahr when new

@ 25 months, 25k, 267 GID, 56.88 Ahr
@ 29 months, 29k, 286 GID, 60.88 Ahr
@ 31 months, 30.3k, 274 GID, 58.39 Ahr

6.72 kW Array

User avatar
RegGuheert
Posts: 5376
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Our solar production

Tue Jan 10, 2017 6:10 am

DNAinaGoodWay wrote:Wet and sunny? You must have that ideal of rain mostly at night. I'd like that.
I've often thought that would be the ideal, too! But then I realized that would likely cause us to overheat.

I think it was more that we caught enough of the thunderstorms to keep it from getting overly dry this year. Some years those thunderstorms just pass us by every time, sometimes to the north and sometimes to the south.
DNAinaGoodWay wrote:Last year was the first time we produced more power than we used, but just barely. Made 9610 kWh, used 9603. That surprised me.
I'm guessing you do not heat with electricity. We actually heated with wood pellets for about three days over the weekend since it was so cold. Back to electricity now...

In terms of our 12-month running net consumption, we had managed to be barely ahead at the end of November by 80 kWh. But it's been pretty cold since then. Plus January 2016 set production records here, so not much chance of a repeat. As of today, we're net consumers of about 400 kWh over the past 12 months. We still have 1.4 MWh stored up, but I don't expect that to last through February.
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

User avatar
dgpcolorado
Posts: 2900
Joined: Sat Aug 20, 2011 1:56 pm
Delivery Date: 15 Dec 2011
Location: The Western Slope, Colorado

Re: Our solar production

Thu Feb 02, 2017 2:14 pm

January was unusually cloudy (and warm) here this year. I was not surprised to find that my solar production for the month was the second worst in the 8½ years I have been tracking it, a measly 157 kWh (December 2010 was my record low production). Until the last four days of the month (when the sun finally returned and the weather was clear and cold, as it should be in winter) I had only one sunny and one mostly sunny day! And lots of snow and rain (rain? in January?) and glare ice on my driveway, a first in my 32 years in Colorado. If this is what I can expect from global warming I don't much like it. :(

Code: Select all

Solar production for January:

          Old Panels    Old+New Panels
Jan-09      77 kWh
Jan-10      76 kWh
Jan-11      88 kWh
Jan-12      93 kWh
Jan-13      88 kWh      247 kWh
Jan-14      95 kWh      262 kWh
Jan-15      84 kWh      235 kWh
Jan-16      82 kWh      227 kWh
Jan-17      58 kWh      157 kWh (!)


Image

^ Model S60 and fuel source.

Image

^ Panels in early morning before pulling the snow off of them.

Image

^ My 400 foot driveway before shoveling (the tracks are from a resident mule deer).
Blue 2012 SV Dec 2011 to Feb 2016
CPO 2014 Tesla S60 Mar 2016
One car, no ICE, at last!
Tesla Referral Code

User avatar
RegGuheert
Posts: 5376
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Our solar production

Thu Feb 02, 2017 3:41 pm

Just like dgpcolorado, we also experienced warm and cloudy weather in January. Our system set a new January LOW production record of only 756 kWh. That's even below the partial-month result of January 2011 of 669 kWh (which when multiplied by 1.29 comes to 863 kWh).

The peak production day for January was on the 25th at 64.6 kWh. This falls short of the daily record for January of 69.0 kWh which was set on January 10, 2015 and again on January 18, 2016.

Below are all our numbers for 2011, 2012, 2013, 2014, 2015, 2016 and 2017 along with the PVWatts predictions for the old array (PVW42: good through June 2014) and the new array (PVW54: good starting with July 2014):

Code: Select all

Month    PVW42   2011   2012   2013   2014   2015   2016   2017  PVW54  Units
-----------------------------------------------------------------------------
January    916    669    869    822    857   1006   1300    756   1229   kWh
February   702    158   1085    866   1054   1361   1192           915   kWh
March      965      0   1350   1152   1113   1547   1498          1240   kWh
April     1465      0   1465   1495   1338   1737   1754          1899   kWh
May       1583      0   1477   1491   1457   2069   1574          2074   kWh
June      1268      0   1478   1368   1521   1585   1932          1666   kWh

Code: Select all

July      1448    595   1395   1406   1880   1823   1887          1902   kWh
August    1442   1347   1447   1333   1794   1887   1932          1875   kWh
September 1209    910   1295   1414   1577   1495   1551          1555   kWh
October   1304    931    981   1034   1258   1415   1593          1713   kWh
November   864    949   1041   1018   1227   1277   1340          1154   kWh
December   820    803    612    669    812    865   1002          1108   kWh
-----------------------------------------------------------------------------
Totals   13986   6362  14495  14068  15888  18067  18555    756  18330   kWh
Our system has produced 88.191 MWh from installation through the end of January 2017.

Net grid consumption since July 2011 (when PV was turned on permanently and a new electricity meter was installed) has been 14.3 MWh. Solar production during this period was 87.3 MWh meaning total consumption was 101.6 MWh. Solar has provided 85.9% of that total.

During the past 12-month period, production was 18,011 kWh and consumption was 18,184 kWh meaning our system was a net consumer of 173 kWh. Put another way, our system produced 99.0% of our consumption over this period, including driving the LEAF approximately 8500 miles.
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

User avatar
RegGuheert
Posts: 5376
Joined: Mon Mar 19, 2012 4:12 am
Delivery Date: 16 Mar 2012
Leaf Number: 5926
Location: Northern VA

Re: Our solar production

Tue Feb 28, 2017 7:56 pm

February was fairly sunny and very warm here. Production was decent at 1241 kWh. That result is about 91% of the record of 1361 kWh set in February 2015.

The peak production day for February was on the 13th at 78.7 kWh. This falls short of the daily record for February of 82.4 kWh which was set on February 27, 2015.

Below are all our numbers for 2011, 2012, 2013, 2014, 2015, 2016 and 2017 along with the PVWatts predictions for the old array (PVW42: good through June 2014) and the new array (PVW54: good starting with July 2014):

Code: Select all

Month    PVW42   2011   2012   2013   2014   2015   2016   2017  PVW54  Units
-----------------------------------------------------------------------------
January    916    669    869    822    857   1006   1300    756   1229   kWh
February   702    158   1085    866   1054   1361   1192   1241    915   kWh
March      965      0   1350   1152   1113   1547   1498          1240   kWh
April     1465      0   1465   1495   1338   1737   1754          1899   kWh
May       1583      0   1477   1491   1457   2069   1574          2074   kWh
June      1268      0   1478   1368   1521   1585   1932          1666   kWh

Code: Select all

July      1448    595   1395   1406   1880   1823   1887          1902   kWh
August    1442   1347   1447   1333   1794   1887   1932          1875   kWh
September 1209    910   1295   1414   1577   1495   1551          1555   kWh
October   1304    931    981   1034   1258   1415   1593          1713   kWh
November   864    949   1041   1018   1227   1277   1340          1154   kWh
December   820    803    612    669    812    865   1002          1108   kWh
-----------------------------------------------------------------------------
Totals   13986   6362  14495  14068  15888  18067  18555   1997  18330   kWh
Our system has produced 89.432 MWh from installation through the end of February 2017.

Net grid consumption since July 2011 (when PV was turned on permanently and a new electricity meter was installed) has been 14.7 MWh. Solar production during this period was 88.6 MWh meaning total consumption was 103.3 MWh. Solar has provided 85.8% of that total.

During the past 12-month period, production was 18,060 kWh and consumption was 17,948 kWh meaning our system was a net producer of 112 kWh. Put another way, our system produced 100.6% of our consumption over this period, including driving the LEAF approximately 8500 miles.
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

Return to “Solar”