|year||total usage kWH||solar kWH||grid kWH||savings $||avg monthly kWH||% solar usage|
Total output from the panels has decreased each year, but that's been mainly due to a larger number of rainy or overcast days. I'm sure some of it is due to dust collecting on the panels. I have yet to get up on the roof to wash them off, and it's something I plan on doing this spring. The wet winter we've had this year has done a decent job of washing the panels for me. Overall, we're very pleased with our solar panels, which have already paid for 28% of the cost (slightly less than I projected due to us using less electricity).