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Friday, June 21, 2024

Summer Solstice 2024

June 20th was the longest day of the year, here in the northern hemisphere. It seems like a good day to look at our solar output.

As you can see in the image above, we had over 15 hours from sunrise to sunset at our Portland, Oregon area home.

Our solar production started just before 6AM and ended just after 8PM for 14 hours of output. Production peaked just after 1PM, aligning with the "solar noon" shown in the first image.

What do the colors mean? This the from the Tesla app. The blue portion is energy that was used to power our home. The green area was charging our Powerwalls. Finally, the grey sections are were we were feeding the grid and running our meter backwards (via 100% net metering). The blue spikes are the AC unit kicking on. It was a hot day. 

Comparing to Previous Years

On this summer solstice day in 2024, we generated 77.6 kWh of electricity. 

I cannot compare this to our 2023 solstice results because we don't have data from last year because the solar panels were off the house while we had our roof replaced. 

In 2022, however, we generated 76.5 kWh. So 2024 performed a little better.

The first summer solstice for our solar panels in their current configuration was 2016. In that year, the longest day of the year yielded 68.6 kWh. So this year was one of our best ever results for a summer solstice. Even though this was the longest day, July usually has a day or two that are over 100 kWh of production. There's less cloud activity in July and the curve of the production output is much smoother. Or maybe it's all the fireworks causing night time production /s

It's nice to see that, even though we've had portions of the system the system since 2007, we are still getting good production from it. I may have to write up a degradation report and compare annual production over the years. Coming soon. Have a great summer!

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