How long until solar panels pay for themselves?

Payback is the key question: when do panels stop paying themselves off and start making me money? Short answer in 2026: 5-9 years for well-sized self-consumption. Long answer below with real numbers.

Simple formula

“Payback (years) = Investment / (kWh generated × kWh price avoided + exported value)”

— Simple model, no inflation discount

Scenario 1: average 5 kW home, no battery, US

Investment: $11,000 (pre-tax-credit). Annual production: ~8,000 kWh. Direct self-consumption 35%: 2,800 kWh × $0.18 = $504. Export 65%: 5,200 kWh × $0.07 net metering = $364. Annual savings: $868. With 30% federal ITC, net cost $7,700 → payback: 8.9 years.

Scenario 2: same home with 10 kWh battery

Investment: $19,000 (pre-credit). Self-consumption climbs to 75%: 6,000 kWh × $0.18 = $1,080. Export 25%: 2,000 kWh × $0.07 = $140. Annual savings: $1,220. With ITC: net $13,300 → payback: 10.9 years (battery stretches payback but adds independence).

Scenario 3: home with an EV

Investment: $15,000 (6 kW + wallbox). Production: 9,600 kWh, 80% self-consumed thanks to EV: 7,680 kWh × $0.18 = $1,382 + export $134. Annual savings: $1,516. Net after ITC: $10,500 → payback: 6.9 years. EVs are the single biggest ROI accelerator.

What speeds up payback

• High retail electricity rate (≥$0.20/kWh)
• Daytime usage (laundry, AC, pool)
• Good orientation (south, no shade)
• Federal/state incentives (often −30%)
• Electricity inflation (every rate hike shortens your payback)

Also see available rebates and tax credits, and if undecided about storage, read when a battery is worth it.