Residential vs Commercial Solar: How System Sizing Actually Works

One of the most common mistakes in solar planning is oversizing or undersizing a system relative to actual consumption. The right system size depends on your historical monthly electricity bill, available shadow-free roof area, and how your load is distributed across the day.

For residential properties, we typically size systems to offset 80-100% of the average monthly bill, accounting for seasonal variation and typical evening-heavy household consumption patterns.

For commercial and industrial properties with predominantly daytime loads — offices, factories, and retail — a larger portion of generated solar power is self-consumed directly, often allowing for a larger system relative to the electricity bill and a faster payback period.

Our site survey process measures actual roof area, shading from nearby structures, and reviews at least 6-12 months of electricity bills before recommending a final system size — never a generic one-size-fits-all number.