Solar, Battery & Clean-Energy Calculators
Free, practical tools for solar, storage, and EV planning — estimate solar payback and ROI, EV charging costs, battery bank sizing, runtime and lifespan, and your household carbon footprint.
Solar ROI Calculator
Estimate annual generation, bill savings, payback period, and 25-year return on a solar PV system from its size, your sun hours, electricity rate, and incentives
EV Charging Cost Calculator
Work out the grid energy, dollar cost, range added, and cost per 100 miles to charge your electric vehicle from one state of charge to another at home
Energy Storage Calculator
Size a home or off-grid battery bank from your daily energy use, days of autonomy, depth of discharge, and system voltage — in both kWh and amp-hours
Carbon Footprint Calculator
Estimate your annual CO₂-equivalent emissions from home electricity, driving, and natural gas, broken down by category and totalled in kilograms and tonnes
Battery Runtime Calculator
See how long a battery will power a load from its amp-hour capacity, voltage, and efficiency, shown in usable watt-hours, hours, and minutes
Battery Lifespan Calculator
Estimate how many effective charge cycles and calendar years a battery will last from its rated cycles, weekly cycling, and typical depth of discharge