The average cost for a 7 kW residential solar system in 2026 is $19,600–$24,500 before incentives. After the 30% federal tax credit, the net cost drops to $13,720–$17,150.
Costs vary by state, system size, equipment tier, and installer. Use our Panel Cost Calculator for a personalized estimate.
Quotes can vary by 30–50% because installers differ in:
- Equipment tier: Premium (SunPower, REC) vs. value (Canadian Solar, Q CELLS)
- Overhead: National companies have higher sales/marketing costs
- Scope: Some include roof upgrade, electrical panel upgrade, or battery
- Margin: Some installers price high expecting negotiation
Always get 3–5 quotes and compare cost-per-watt, not just total price.
Cost-per-watt = Total system cost ÷ system size in watts. It is the standard metric for comparing quotes.
In 2026, a good price range is:
- Excellent: $2.40–$2.80/watt (before incentives)
- Good: $2.80–$3.20/watt
- High: $3.20–$3.80/watt (may include premium equipment)
- Avoid: Above $3.80/watt (unless includes battery/storage)
Most homeowners save $800–$1,800 per year on electricity bills. Over 25 years, total savings typically range from $20,000 to $45,000, depending on location, system size, and electricity rate trends.
Use our Solar Savings Calculator to get a personalized savings estimate for your home.
The average payback period in the US is 7–12 years after incentives. Factors that shorten payback:
- High local electricity rates (CA, CT, NY: 5–8 years)
- Strong state incentives (MA, NJ, NY)
- High electricity usage (large home, EV, heat pump)
- Buying (vs. leasing) the system
Use our Payback Period Calculator to calculate your exact payback.
Yes. Multiple studies (Zillow, Berkeley Lab) confirm solar panels increase home resale value by 4–6% on average. In California, owned solar adds approximately $15,000–$25,000 to home value.
Key caveat: Owned solar increases value; leased solar can complicate or even reduce sale prospects. Always buy, don't lease, if you plan to sell within 10 years.
Yes. The Federal Investment Tax Credit (ITC) remains at 30% for systems installed through 2032, under the Inflation Reduction Act. It then steps down to 26% in 2033 and 22% in 2034 before expiring for residential systems.
To claim it, you must own the system (purchase with cash or loan). Leases and PPAs do not qualify for the homeowner to claim.
Additional incentives vary by state and utility:
- State tax credits: NY (25%), SC (25%), HI (up to $5,000)
- Rebates: Utility rebates up to $1,000/kW (SDG&E, PG&E in CA)
- SRECs: Solar Renewable Energy Certificates (MA, NJ, MD, DC, PA) — earn $50–$300/MWh
- Property tax exemption: Many states exempt solar from property tax assessment
- Sales tax exemption: AZ, FL, NJ, NY exempt solar equipment from sales tax
Check DSIRE for a complete database of incentives by zip code.
Yes. As long as you own the system (the loan is secured by the system, not a personal loan for any purpose), you can claim the 30% federal tax credit. The loan itself does not disqualify you.
However, if the loan is a "solar lease" structured as a loan, or if the installer retains ownership, you cannot claim the credit. Always confirm ownership in writing.
Net metering allows you to export excess solar electricity to the grid and receive a credit on your bill. When your panels produce more than you use, the meter runs backward. At night, you draw from the grid using those credits.
In full-retail net metering states (NY, NJ, MA), you get credited at the full retail rate (∼$0.20–$0.35/kWh). In NEM 3.0 states (California), you get credited at a much lower "avoided cost" rate (∼$0.05–$0.08/kWh), making batteries more economic.
Yes, but the economics change. Without full-retail net metering:
- Add a battery to store excess energy (self-consumption)
- Size the system closer to your daytime usage (avoid overproduction)
- Consider EV charging during the day to use more solar directly
In California (NEM 3.0), solar + battery still provides 8–12% ROI for most homeowners, compared to 15–20% with full net metering.
The physical installation typically takes 1–3 days. However, the full process from signed contract to turned-on system takes 2–6 months because of:
- Permitting: 2–8 weeks (varies by city/county)
- Interconnection approval: 2–12 weeks (utility-dependent)
- Inspection: 1–2 weeks after installation
- Final PTO (Permission to Operate): 1–4 weeks after inspection
Solar panels require minimal maintenance. They have no moving parts and are designed to last 25–30 years. Basic maintenance:
- Cleaning: 1–2 times per year (or after heavy pollen/dust/snow)
- Monitoring: Check your app monthly for production drops
- Professional inspection: Every 3–5 years (inverter check, wiring)
Rain typically handles cleaning in most climates. In dusty areas (AZ, NM) or areas with heavy pollen (GA, NC), manual cleaning or professional service ($150–$300) may be needed annually.
A quality solar installation includes three types of warranties:
- Panel performance warranty: 25 years (guarantees 80–87% production at year 25)
- Panel product warranty: 10–25 years (covers defects, delamination, corrosion)
- Inverter warranty: 10–12 years (extendable to 20 years)
- Installer workmanship warranty: 5–25 years (covers roof penetrations, wiring, labor)
Always choose an installer that offers at least 10 years workmanship warranty.
Not always. You need a battery if:
- Your utility has time-of-use (TOU) rates — charge at night, discharge during peak
- You live in an area with frequent power outages (wildfire zones, hurricane zones)
- Your state has NEM 3.0 (CA) — batteries improve economics significantly
- You want energy independence and backup power
You do NOT need a battery if you have full-retail net metering and rare outages — the grid acts as your "battery" for free.
A typical home battery (10–13 kWh) costs $10,000–$15,000 installed before incentives. After the 30% federal tax credit, the net cost is $7,000–$10,500.
Popular models in 2026:
- Tesla Powerwall 3: 13.5 kWh, ∼$11,500 installed
- Enphase IQ 5P: 5 kWh per unit, 2–3 units typical, ∼$12,000–$16,000
- FranklinWH aPower: 13.6 kWh, ∼$13,000 installed
| Option | Pros | Cons |
|---|---|---|
| Cash | Best ROI, no interest | High upfront cost |
| Loan | 30% tax credit, low upfront | Interest (4–9%), lien on home |
| Lease/PPA | $0 down, no maintenance | No tax credit, lower savings, hurts resale |
Recommendation: Buy with cash or a solar loan. Avoid leases/PPAs unless you cannot qualify for a loan and have no tax liability for the ITC.
Most roofs can support solar panels. Installers conduct a structural assessment before installation. General guidelines:
- Asphalt shingle (good): 10+ years of life remaining needed
- Metal roof (excellent): Best for solar (standing seam, no penetrations)
- Tile roof (moderate): Possible but more expensive (special racking)
- Flat roof (good): Uses ballasted racking, no roof penetrations
If your roof is within 5–10 years of needing replacement, replace it before or together with solar. Some installers offer integrated roof+solar pricing.
Shade significantly reduces solar production. However, solutions exist:
- Microinverters (Enphase): Each panel operates independently — shade on one panel doesn't affect others
- Power optimizers (Solaredge): Similar to microinverters but with a central string inverter
- Trim panels: Remove or trim trees that cast shade 9am–3pm
If more than 30% of the roof is shaded during peak sun hours, solar may not be cost-effective. Get a professional shade analysis (SunEye or aerial imagery) before deciding.
Solar panels degrade slowly — approximately 0.3–0.5% per year. After 25 years, they still produce 80–87% of their original output. They can continue operating for 30–40 years, just at reduced efficiency.
Inverters typically need replacement at 12–15 years (string inverters) or 20+ years (microinverters, with extended warranty).
Our calculators use industry-standard formulas and data from EIA, NREL, and SEIA. They provide estimates within ±10–15% of a professional quote for typical scenarios.
However, they are estimates only. Actual costs depend on your specific roof, electrical panel, local permits, and utility policies. Always get professional quotes for exact pricing.
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