ROI & payback

Quick answer: An 800-watt plug-in solar kit in a decent location produces roughly 600–900 kWh per year. At a 17¢/kWh U.S. average that’s about $100–$150 in annual savings, so a $500 kit pays back in three to five years and then makes free power for its 20–25-year lifespan.

A ~800W kit in a decent spot makes roughly 600–900 kWh/year (less if shaded/vertical). Multiply by your rate for yearly savings. Use our calculator to run your own numbers.

Payback = kit price ÷ yearly savings. A $500 kit saving $120/year pays back in ~4 years, then makes free power for its 20–25 year life.

Three levers matter most: your electricity rate (biggest), sun/orientation, and kit price. A cheap kit in a high-rate state is often the best deal.

If you own the spot or rent stably, face some sun, and pay average-or-higher rates, the numbers usually work — and you can take the kit with you when you move.

Always confirm current local rules with your utility before buying or installing.

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ROI & payback

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