Solar Savings Calculator
Estimate annual savings from a solar array.
Estimate the yearly electricity savings from solar panels.
How the Math Works
The Solar Savings Calculator uses the formula kWh/year = kW × sun hours × 365 × efficiency to estimate annual energy production. Here, kW represents the solar array's capacity, sun hours are the average daily sunlight duration (in hours), 365 accounts for days in a year, and efficiency factors in energy loss from components like inverters and weather. This equation scales system size and sunlight to predict usable electricity output.
Practical Applications
To use this calculator, input your solar system's kilowatt capacity, your location's average daily sunlight hours (obtainable via weather or solar irradiance databases), and system efficiency (typically 80-95% for modern panels). The result converts potential energy generation into real-world kilowatt-hours, which can then be multiplied by your utility's rate per kWh to estimate annual savings. Adjust inputs to model different system sizes or technologies.
Day-to-Day Use
This calculation helps homeowners budget for energy bills by quantifying solar panel savings before installation. It guides decisions on system size and financing, revealing payback periods and long-term cost reductions. Additionally, knowing projected savings aids in advocating for energy independence, reducing reliance on grid power, and supporting environmental goals through cleaner energy adoption.
Worked example
6 kW, 5 sun hours, $0.15 → ~$1,314/year.
FAQ
Sun hours?
The equivalent hours of full sunlight per day for your location.