Yea like @WxUSAF said winter is lower. This winter in particular. Our system covers 80% of the household power. Our solar benefits start around Mar and go through Oct/Nov. We live in a TH that the front faces E and the back W. We have a lot of windows, hence the model called the Brightwell. As soon as the DST changes in the spring lights are not on in the house till around 8pm. Also run our AC less than most people.