Calculator

Plug-in solar savings calculator

Plug in your kit size, sun hours, electric rate, and what fraction of production you'll use directly. Estimates only — real results depend on your roof, shading, and weather.

Solar kit wattage: 800 W

200W2,000W

Average sun hours per day: 4.5 h

2h (cloudy north)7h (desert SW)

Electricity rate: $0.17 / kWh

$0.08$0.45

% of production used directly: 85%

System cost: $900

Your estimate

Daily production: 2.81 kWh
Monthly production: 84 kWh
Monthly savings: $12.17
Annual savings: $146
Estimated payback: 6.2 years

These are rough estimates based on simple assumptions and a 78% system derating. Real-world results depend on panel orientation, shading, weather, your utility's billing structure, and how much production lines up with your usage. Not financial advice.