A: On the roof of our house is a 15kW array that produces about 15,000kWh a year with a 10kW and a 5kW inverter. On the roof of our garage (which is partly shaded) is a 13kW array that produces about 7,000kWh a year with a single 10kW inverter. On the roof of our rental property is a 17kW array that produces about 15,000kWh a year through a 10kW and a 5kW inverters.