Solar + EV + Home Battery Payback Calculator
The full energy-home picture: solar panels powering your EV and home, with or without a battery. See total cost, yearly savings and the break-even year.
Total system cost
Savings / year
Payback
25-year value
Battery worth it?
Estimates only — local prices, feed-in tariffs and incentives change the math significantly. Check your region's solar rebates.
Frequently asked questions
How long does solar + EV + home battery take to pay back?
Typically 7-12 years depending on your region, electricity price and system cost. The payback shortens as grid prices rise and system costs fall.
Is a home battery worth it with solar and an EV?
Yes if you charge the EV at night or want backup power. A 10 kWh battery stores daytime solar for evening use, raising self-consumption from ~40% to ~80%.
How much does a home battery add to the system?
$5,000-9,000 for a 10 kWh unit installed. It typically adds 2-4 years to the payback period but greatly improves energy independence.
Should I oversize my solar for a future EV?
Usually yes. Adding panels later costs more per watt. If an EV is likely, build the array 40-60% larger now.