January 29, 2017, was cold, cloudy, and rainy, a worse case scenario for our photovoltaic system. I stood the chill as long as I could, but finally gave in and turned on my electric heat. Because of the clouds, our solar panels only generated 1.9 KWH of energy while the heat used over 30 KWH. The percentage from solar shown in the chart is the result. The chart below shows a very atypical day where all of our energy came from the grid and none from our solar panels.
The chart below shows the last ten days of percentage from solar. We were doing quite well actually until the cold front came down and stalled over us.