Solar Power Production Tracker

I’ll try to keep this page updated every month with our solar power production and compare it with the PVWatts estimate of expected generation. For more details about our first solar system (6.93kW of panels, 6kW inverter), visit my blog post about finding solar installers in Charlottesville. At the end of December 2016 we added another 9.425 kW, which got grid connected in Feb 2017. We also upgraded the old system to have online monitoring so now I don’t need to keep visiting the inverter to collect this data.

For a more detailed financial analysis of solar production in Virginia, see my post on that at my other blog. There is a slight discrepancy between the solar inverter numbers and the dominion solar generation meter, which also I’ll keep track of. After installing the new system, this discrepancy grew a lot. I got the Dominion meter tested and it is only off by 0.4% (supposedly it can be legally off by upto 2%). So the old meter (PowerOne) is reporting production accurately (off by exactly 0.4%). The the new inverter (Solaredge) is significantly (6.9% between Feb 2017 to Nov 2017) over-reporting it’s power production.

Year\Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
PVWatts Old System Estimate 505 425 675 695 742 689 705 661 581 731 473 490
New System Estimate 505 425 675 695 742 689 705 661 581 731 473 490
2014 (Inverter) 279 850 928 941 928 794 705 651 527 472
2014 (Meter) 277 847 923 936 923 790 701 648 525 470
2015 (Inverter) 490 622 714 909 1010 809 841 888 691 672 526 373
2015 (Meter) 489 619 711 905 1004 804 837 884 687 669 523 372
2016 (Inverter) 500 591 771 662 709 875 921 890 644 732 610 423
2016 (Meter) 498 589 766 659 706 871 916 885 641 729 605 422
2017 (Old Inverter) 312 582 884 859 798 922 873 867 783 738 531  418
2017 (New Inverter) 551 996 999 1029 1220 1150 1058 891 777 484  377
2017 (Meter) 312 1107 1821 1800 1768 2073 1960 1863 1621 1467 984  769

April 2014 was the first full month of production. * First system went live March 19. So March 2014 production numbers represent a partial month. New system went live Feb 8 2017.

Cumulative Power Production as of Dec 31 2017: 41377 (at dominion meter), 42048 (as measured by inverters)

The chart below has not yet been updated since the new system. Once I figure out a good way to do it, I’ll update.

Solar Panels
Solar Awning

22 thoughts on “Solar Power Production Tracker

  1. I assume the picture of the solar panels are the ones on your roof. Been a few years since there was snow in Houston. Remember that day cause, I was a substitute teacher at Pasadena High School and the kids ran out of class to have a snowball fight outside.

    Kids will be kids.

  2. Yeah they are the panels on my roof. Snow is fun, especially if you only get it one or two times a year like here. That picture was taken just a few days or maybe weeks after the panels went online.

  3. Sidd, long time since I visited your site. You need to update, I need to come out here more often. And one of these days, when I get that Tesla pickup, I will travel from Texas to see your solar panels in person. Smell it, touch it, feel it, I am one of those types of people.( sorry just me )

    Only got up to June of 2017 and it is now November. Also, weather in your area, how big is your place, how much light, etc….But I like seeing your article on the Semi. 90% market share in 5 years. And probably a good idea for E-long to do the semi before a regular pickup.

    Gotta sell it to Bubba that Semi electric can handle the Rockies before they go for the pickup at the ranch. Probably it will work, and in 10 years Tesla will have a big chunk of the overall vehicle market. Then I can really retire and not worry about having a roof over my head.

    Cheers!

  4. Thanks! I’ll update the data upto November in a few days.

Leave a Reply