How big a solar panel should be for on-site energy

How do I choose the right solar panel size?

The solar panel size directly affects how much power your system can produce, how many panels you need, and whether your available roof space can support the installation. Choosing the proper system is not only about the solar panel dimensions. You should also consider wattage, number of cells, layout possibilities, and energy consumption.

How much energy does a solar system use?

Estimate Your Solar System Size Each panel is around 400 watts, or 0.4 kW. However, besides energy consumption, other factors should be considered when estimating your solar system size. Roof size: A typical panel is 17.5 sq. ft. You’ll need about 400–500 sq. ft. of roof space for 25 panels.

How big should a solar panel be?

To get even more power, some solar panels have become slightly larger (about 2.456 m tall for 156 half-cell formats) to reach 600 W or more. This helps you visualize how higher-wattage modules often require slightly larger footprints. Choosing the right panel for your space can boost overall system efficiency and reduce installation complexity.

How much space do solar panels need?

SolarTech’s regional production data helps hit that sweet spot for maximum value and performance. Each solar panel requires approximately 17-20 square feet of roof space, including necessary spacing for installation and maintenance. A typical 20-panel system needs 340-400 square feet of unshaded roof area.