How the Solar + EV Calculation Works

This calculator estimates annual solar energy production based on your system size and state. Sunny states like Arizona and Nevada produce roughly 1,600 kWh per installed kW per year, while cloudier states like Washington and Michigan produce around 1,000 kWh/kW/yr. Most states fall in the middle at about 1,300 kWh/kW/yr. Your EV's energy consumption is calculated from its EPA-rated efficiency and your daily driving distance.

Why Solar and EVs Are Better Together

Solar panels alone offset your home electricity bill, which provides moderate savings. Adding an EV dramatically increases your electricity consumption, which means more of your solar production displaces expensive grid power. This synergy makes both investments pay off faster. A homeowner who installs solar before buying an EV may see a 10-year payback. That same homeowner with an EV could see a 7-year payback because the savings per year are higher.

Net Metering Makes It Work

Most EV owners charge overnight, but solar panels produce during the day. Net metering bridges this gap: your solar system exports excess power to the grid during the day, and you receive credits that offset the electricity you draw at night for EV charging. The grid acts as a free battery. However, net metering policies vary by state and utility. Some states offer full retail credit, while others offer reduced rates. Check with your utility for specific terms.

Solar Tax Credits in 2026

The residential solar tax credit (Section 25D) was eliminated by the One Big Beautiful Bill Act signed in July 2025. If you buy and own your solar system outright, there is no longer a federal tax credit available. However, third-party-owned systems (leases and Power Purchase Agreements) may still benefit from the Section 48E commercial credit at 30% through the end of 2027. Many states also offer their own incentives, including rebates, property tax exemptions, and renewable energy credits. Check your state's energy office for current programs.