First quarter 2018 performance

Q1 2018 summary: 4% colder, 3% less usage and 13% less sun as compared to Q1 2017.

This is part of our quarterly home performance reporting. All data is posted at

I said it last year and I’ll say it again, it was a whacky winter. Lots of cold days, but also lots of warm days. It would be warm for a week or two, the ground would thaw, then we’d get snow.

We recorded a low of -17.1 on January 7, close to our lowest recorded temperature of -17.3°F on February 14, 2016. Our high was 77.6, higher than the 73.6°F last year. In 2012 we recorded a high of 82.4°F in the same period.

Overall, here’s how this quarter compared to 2017.

Q1 Comparison 2017-2018

2017 Usage Solar PV Net usage
or (surplus)
daily usage
Total 2,710 1,586 1,123 30.1 3,056
Jan 1,035 357 678 33.4 1,086
Feb 783 478 305 28.0 890
Mar 892 752 141 28.8 1,079
2018 Usage Solar PV Net usage
or (surplus)
daily usage
Total 2,640 1,375 1,265 29.3 3,173
Jan 1,093 375 718 35.3 1,294
Feb 768 399 368 27.4 894
Mar 780 602 178 25.2 985
All values in kWh (except HDD which is base 65°F).

You can see heat maps and detailed charts of temperature and electrical usage at View hourly, daily and monthly values for solar, usage, net usage, circuit-level usage, temperatures and HDD.

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