Solar System Cost by Size (2026)
System size is the biggest driver of total cost. Most US homes need 6–10 kW. Prices below use the $2.80/W national average from Lawrence Berkeley Lab's Tracking the Sun.
| System Size | Panels (400 W) | Gross Cost | Annual Output (avg US) | Best For |
|---|---|---|---|---|
| 4 kW | 10 | $11,200 | 5,200 kWh | Small home / low usage |
| 6 kW | 15 | $16,800 | 7,800 kWh | 1–2 person household |
| 8 kW | 20 | $22,400 | 10,400 kWh | Average US household |
| 10 kW | 25 | $28,000 | 13,000 kWh | Large home / EV charging |
| 12 kW | 30 | $33,600 | 15,600 kWh | High-usage / pool / multiple EVs |
* 8 kW row = national typical. Source: LBL Tracking the Sun 2025; PVGIS avg US yield 1,300 kWh/kWp.
What Makes Up the Cost? Full Breakdown
Equipment is roughly 65–70% of the total. Labor is 12–15%. Permits, electrical upgrades, and utility fees make up the rest.
| Component | Cost Range | Share | Notes |
|---|---|---|---|
| Solar panels (20 × 400 W) | $9,000–$12,000 | ~50% | Tier-1 monocrystalline; brand affects price 10–20% |
| Inverter | $2,000–$5,000 | ~15% | Microinverters cost more but add per-panel monitoring |
| Racking & mounting | $1,500–$3,000 | ~10% | Roof rails, clamps, flashing |
| Labor & installation | $2,500–$4,000 | ~14% | 1–3 days; unionized markets cost more |
| Permits & inspections | $500–$1,500 | ~5% | Varies hugely by municipality |
| Electrical upgrades | $500–$2,000 | ~6% | Panel upgrades, EV wiring if needed |
Solar Cost by State: 10 Best Markets
| State | Avg $/W | 8 kW Cost | State Credit | Avg Payback |
|---|---|---|---|---|
| Arizona | $2.55/W | $20,400 | None | 8 yrs |
| Nevada | $2.60/W | $20,800 | None | 9 yrs |
| Texas | $2.65/W | $21,200 | None | 13 yrs |
| Florida | $2.65/W | $21,200 | None | 11 yrs |
| New Mexico | $2.75/W | $22,000 | 10% | 9 yrs |
| Colorado | $2.75/W | $22,000 | None | 11 yrs |
| North Carolina | $2.80/W | $22,400 | None | 12 yrs |
| Georgia | $2.85/W | $22,800 | None | 13 yrs |
| New York | $3.05/W | $24,400 | 25% | 9 yrs |
| Massachusetts | $3.10/W | $24,800 | 15% | 8 yrs |
Sources: LBL Tracking the Sun 2025; EIA state electricity rates 2025.
The Federal ITC Expired — What Changes?
The 30% Section 25D residential solar credit expired December 31, 2025. On an 8 kW system at $22,400, homeowners previously could claim a $6,720 federal tax credit. That is no longer available. The IRS Residential Clean Energy Credit page confirms the expiration.
State-level incentives remain. New York's 25% state credit saves $5,600 on an 8 kW system. Massachusetts' 15% credit saves $3,720. Property tax exemptions apply automatically in 36 states. The commercial Section 48 credit for businesses was not affected. Check the DSIRE databasefor your state's current incentives.
Frequently Asked Questions
How much does a solar system cost in 2026?
Did the federal solar tax credit expire?
How much can I save by getting multiple quotes?
Are solar panels cheaper in 2026 than before?
What size solar system do I need?
Key sources:
• Lawrence Berkeley Lab — Tracking the Sun 2025 (installed cost data)
• EIA — State Electricity Profiles 2025 (electricity rates)
• DSIRE — Database of State Incentives for Renewables & Efficiency
• PVGIS — EU JRC Photovoltaic Geographical Information System (solar yield data)
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