Solar + EV Charging: How to Drive for Nearly Free
A home solar system paired with an EV can reduce your effective charging cost to $0.03–$0.05/kWh — less than 1¢ per mile. Here's the math.
The Solar + EV Math
A typical 6 kW solar system in a sunny state produces about 8,000–10,000 kWh/year. A Tesla Model Y driving 15,000 miles/year consumes about 4,300 kWh. Your solar system can cover 100% of EV charging and still have surplus. After federal tax credits (30% ITC), a 6 kW system costs about $12,000–$16,000 installed — typically 6–9 year payback when including both electricity and EV savings.
Effective Cost Per kWh with Solar
If your solar system costs $15,000 after incentives and lasts 25 years, producing 200,000 kWh total, your effective generation cost is $0.075/kWh. When displacing $0.20/kWh grid power, your net effective charging cost drops to near zero. Add net metering credits and the math gets even better.
Best States for Solar + EV Savings
California, Arizona, Texas, and Florida offer the best solar production plus relatively high grid electricity costs — maximizing the value of self-generation. California drivers can achieve effective EV charging costs under $0.03/kWh combining solar production value and avoided high-cost grid electricity.
Solar + Battery Storage
Adding a home battery (Tesla Powerwall, Enphase IQ, LG RESU) lets you store solar energy for overnight EV charging. At $8,000–$12,000 installed, batteries add 5–8 years to payback but enable true energy independence and protect against grid outages.