If you own a home or property that has a pitched roof, your operations and maintenance cost is non-existent. The system will require tweaking in year one, which is covered under the Execon five-year workmanship warranty. As long as your system has critter-guard and there is zero human interaction there will be no need to calculate operations and maintenance into your overall project cost. The manufacturing warranty for the panels is for 25 years, and the inverter warranty is for 10 years. Be prepared to replace your inverter after year 10.