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What are the maintenance procedures and costs?
Solar PV systems have no moving parts and require no maintenance beyond cleaning, which can typically be done with a garden hose. Most systems should be cleaned 2-4 times a year, specially when it´s dusty.
Inverters require little to no maintenance beyond regularly checking the cooling fan outlets and cleaning when necessary. Mounting hardware is either aluminum or stainless steel and is rust-proof.
Does cleaning the modules require any special expertise or equipment?
Some people use a high-pressure sprayer from the ground when the panels are reachable. A simple garden hose may do just as well.
What parts will break first?
The inverters typically have a useful life of 15-20 years.
What about rust and oxidization?
All hardware is made for outdoor use and is made of either rust-proof stainless or galvanized steel or aluminum.