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What Size Solar System Do You Actually Need?

Aerial top-down view of modern California home showing what size solar system do i need with true black-on-black back-contact solar panels solid matte black flush aligned across multiple roof planes illustrating system sizing based on roof space.

The most common question homeowners hit early on is how big a solar system they need, and the answers online swing wildly. This plain-language guide shows how system size is really decided: start from a full year of your own electricity usage, convert it to a target kilowatt size, then adjust for roof space, your offset goal, NEM 3.0 self-consumption, and any future load like an electric vehicle.