Average Solar System Costs in 2024
The average residential solar panel system in 2024 costs $20,000–$30,000 before incentives, according to the Lawrence Berkeley National Laboratory's Tracking the Sun report. After the 30% federal Investment Tax Credit (ITC), that range drops to approximately $14,000–$21,000.
Cost Per Watt: The Industry Standard
Solar is typically priced in cost per watt ($/W). In 2024, residential solar averages $2.50–$3.50/W installed (all-in, including equipment, labor, permits, and overhead). Cost per watt has fallen dramatically — from $7.50/W in 2010 to current levels — but has plateaued in recent years due to labor cost increases offsetting panel price declines.
Cost by System Size
| System Size | Before ITC | After 30% ITC | Typical Home Size |
|---|---|---|---|
| 4 kW | $10,000–$14,000 | $7,000–$9,800 | Small (under 1,500 sq ft) |
| 6 kW | $15,000–$21,000 | $10,500–$14,700 | Medium (1,500–2,500 sq ft) |
| 8 kW | $20,000–$28,000 | $14,000–$19,600 | Large (2,500–3,500 sq ft) |
| 10 kW | $25,000–$35,000 | $17,500–$24,500 | Very large or EV owner |
What's Included in the Price
- Solar panels: 30–40% of system cost. Tier 1 manufacturers (LG, Panasonic, SunPower, REC) cost more but offer better efficiency and warranties.
- Inverter: 10–15% of cost. String inverters are cheapest; microinverters (Enphase) or power optimizers (SolarEdge) cost more but perform better under shading.
- Racking and mounting: 5–10% of cost
- Labor and installation: 25–35% of cost — highly variable by market
- Permits and interconnection: $500–$2,000 depending on jurisdiction
State Incentives Beyond the Federal ITC
The 30% federal ITC is the biggest incentive, but many states offer additional savings:
- California: Property tax exclusion for solar; no sales tax on panels
- New York: 25% state tax credit (up to $5,000) + NYSERDA rebates
- Massachusetts: SMART program — guaranteed payments for solar production
- New Jersey: Solar Renewable Energy Credits (SRECs) + exemptions
- Texas: Property tax exemption; some utilities offer rebates
Financing Options
Solar Loan (Buy with Financing)
Solar loans allow you to own the system while spreading payments over 10–25 years. Interest rates typically range from 3–9% depending on credit score and lender. You capture the full ITC and all production benefits while building equity in the system.
Solar Lease
With a lease, a third party owns the system and you pay a monthly fee for the electricity or power produced. Leases typically run 20–25 years. The ITC goes to the system owner, not you. Monthly payments are predictable, but you don't build equity and must transfer the lease if you sell your home.
Power Purchase Agreement (PPA)
Similar to a lease, but you pay per kWh produced rather than a flat monthly fee. PPAs often have escalator clauses (2–3%/year price increases). Like leases, the ITC benefits go to the system owner.
Bottom Line
For most homeowners, buying with cash or a solar loan provides the best long-term financial outcome. The 30% federal ITC plus state incentives and avoided electricity costs typically result in payback periods of 6–12 years, followed by 13–19 years of essentially free electricity from a 25-year system.