Third quarter 2018 performance

Q3 2018 summary: 33% warmer, 1% more usage and 7% less sun as compared to Q3 2017.

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

Nothing exciting to report, which is normal for 3rd quarters.

At 7am on July 15th we became net positive for the year. As of the end of September, we have a surplus of 1,115 kWh heading into the final months of 2018. That’s about 211 less kWhs than last year at this time. Overall for the year, our solar production is down about 7%.

Overall, here’s how this quarter compared to 2017.
Chart showing usage, solar, net and hdd

2017 Usage Solar PV Net usage
or (surplus)
daily usage
Total 1,045 2,657 (1,611) 11.4 254
Jul 322 848 (527) 10.4 39
Aug 377 944 (567) 12.2 73
Sep 347 864 (517) 11.6 143
2018 Usage Solar PV Net usage
or (surplus)
daily usage
Total 1,056 2,483 (1,427) 11.5 171
Jul 386 986 (601) 12.4 28
Aug 317 809 (491) 10.2 17
Sep 353 688 (335) 11.8 126
All values in kWh (except HDD which is base 65°F).

Water usage was down 7%. Hot water usage down 13%.

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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