Second quarter 2018 performance

Q2 2018 summary: 18% colder, 2% less usage and 4% more sun as compared to Q2 2017.

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

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

Q2 Comparison 2017-2018

2017 Usage Solar PV Net usage
or (surplus)
daily usage
Total 1,421 2,258 (837) 15.6 847
Apr 531 758 (227) 17.7 421
May 514 692 (178) 16.6 315
Jun 375 807 (432) 12.5 110
2018 Usage Solar PV Net usage
or (surplus)
daily usage
Total 1,396 2,349 (953) 15.3 997
Apr 627 660 (32) 20.9 724
May 470 850 (381) 15.2 162
Jun 300 839 (540) 10.0 111
All values in kWh (except HDD which is base 65°F).

Quite a bit cooler this quarter. The last day we used heat was May 1. That’s about 2 or 3 weeks later than usual.

Here’s our breakdown on energy use and cost for the last six winter seasons.

Winter season Heat kWh Est. Cost
2012-13 957 $144
2013-14 1,804 $271
2014-15 2,200 $330
2015-16 1,305 $196
2016-17 1,804 $271
2017-18 2,103 $315
Est. cost based on $0.15 kWh.

We would have spent about $1,527 (if we paid for electricity) for the last six winters.

We haven’t netted out energy-wise yet. We’re still 312 kWh short. In 2016 we netted out on May 31 after 8am. In 2015 we were 637 kWh short. In 2014 we netted out around mid-July. In years prior we were net positive by May or June.

Our overall water usage is down 6% from Q2 2017. It started out dry this quarter but the rain picked up. We only had to water the garden a few times. Out hot water usage was down 22%.

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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