Automatic solar panel washing and fire fighting system, Wifi based controller can drive single motor with 3 to 10 solenoid valve, it can be install on any residential and commercial units, you can wash 20 to 100 panels in just 3 to 10 minutes. 3 models are available ASPWS-3 , price 35000 ASPWS-5, price 45000 ASPWS-10 price 65000 These controllers are used for small to large solar system, depending upon system size,( total number of panels)