Cleaning the solar panels operating for 15 months has made their output of electricity double.

Rain is not a satisfying way of cleaning solar panels. Solar panels that were cleaned professionally had a 12% higher output of electricity compared to those cleaned by rain. This literally means that they will generate 15-25% less electricity, which you will have to source from the utility company at their price rates. This easily adds a couple of years on the payback time. So it is important to clean solar panels in order to protect and maintain your investment.

Cleaning the solar panels operating for 15 months has made their output of electricity double.