Solar + EV Charging Savings Calculator — Combined Annual Savings
Calculate combined annual savings from pairing solar panels with EV home charging. See how much solar covers your EV charging and what the net financial benefit is.
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How to use this calculator
- Enter your annual driving miles to calculate EV charging energy needs.
- Enter your EV's efficiency in miles per kWh (find this in your vehicle specs).
- Enter your solar system size in kW.
- Enter your local electricity rate and peak sun hours (or use the state selector).
- See what fraction of your EV charging your solar covers and the total annual savings.
Understanding your results
Solar + EV synergy: An EV adds a large, flexible electricity load that can be timed to coincide with peak solar production. Unlike your fridge or HVAC that run on a fixed schedule, EV charging can be programmed for 10am–3pm when solar output is highest — dramatically increasing self-consumption and reducing grid imports.
Annual EV charging energy is calculated as: annual miles ÷ vehicle efficiency (mi/kWh). A 12,000 mile/year driver in a 3.5 mi/kWh efficiency EV uses 3,430 kWh per year for charging — about 30% of a typical home’s electricity consumption.
Solar coverage: If your solar system produces 10,000 kWh per year and your EV needs 3,400 kWh, solar can theoretically cover 100% of your EV charging if you time charging to solar peak hours. In practice, 60–80% solar coverage is achievable with daytime charging.
Combined financial case: The average US driver saves $1,200–$1,800/year switching from gas to electric. Pairing with home solar adds another $500–$1,000 in electricity savings. Combined, the annual savings often exceed $2,000 — significantly improving both EV and solar payback periods.