Dec 05, 2021 · So, you’ll need 100 x 7.5 = 750 sq. ft. of roof space to house a 7.5kW residential solar system. When it comes to solar farms, everything is calculated in a similar fashion but on a much grander scale. For instance, a 5 MW (megawatt, where 1 MW = 1,000 kW) solar farm would require a minimum of 100 x 5,000 = 500,000 sq. ft.
