[marze]

Fortunately, solar photovoltaic doesn't need servicing.

Energy is big business, revenue will be there for servicing once market share is there.

[intrasight]

Solar photovoltaic probably needs more servicing per kWh than any other method. If those panels aren't clean, you don't get the expected return.

[digikata]

I predict at some point that something like an roomba for solar panels might spring into existence...

[patrickk]

They actually already exist. Google "solar panel cleaner robot" or similar.