Ground-mounted solar arrays designed and capable of production of electrical energy not to exceed 110% of the energy needs of the principal structure located upon the same lot, based upon the average electric utility usage over the three-year period immediately prior to the application for the zoning permit. Provided, however, that no portion of the solar arrays shall exceed a height of eight feet above existing grade. Such solar panel arrays shall be located in the side or rear yard areas, only, of the lot and, must meet accessory structure setbacks and maximum accessory structure area limitations for accessory structures. If located in the side yard areas of the lot, the ground-mounted solar panel arrays shall be buffered from view of adjoining properties and roadways by fencing or vegetation by evergreen plantings having a minimum planted height of 48 inches and not exceeding an on-center planting spacing of 10 feet.