A 1 kw solar panel requires approximately 100 square feet of roof space. A single panel is about 4 feet long and 30 inches wide.
The amount of total space a solar panel system will require depends on the size of the system and how much of an energy impact the system is intended to produce. A solar panel system can range in impact from offsetting energy expenses, to full energy independence from other sources. The size of your home or business will also be a determining factor in the size and amount of solar panels used. The energy savings of solar energy alternatives can be estimated using an online solar calculator.