Solar quotes can look confusing. One company says $18,000, another says $27,000, and both claim to be a good deal. The easiest way to compare them is by price per watt. This guide shows what that number looks like in 2026, what a full system costs at each size and why prices vary.
All prices are US averages as of October 2026, before any state or local incentives.
What is the price per watt for solar in 2026?
Price per watt is the total installed cost divided by the system's size in watts. A 6 kW system is 6,000 watts. If it costs $18,000, that is $18,000 ÷ 6,000 = $3.00 per watt.
Two widely cited sources set the range for 2026:
- About $2.60 per watt. EnergySage's H1 2026 marketplace data shows this for a typical 12 kW system, with an average total of about $31,135. These are competitive quotes from shoppers comparing several installers.
- About $3.36 per watt. SEIA/Wood Mackenzie Q3 2026 reports this as the national residential average. It covers the wider market, including big national sales companies with higher overhead.
So a fair quote in most areas lands between $2.60 and $3.36 per watt. Prices in some high-cost areas can run higher. A quote above about $3.75 per watt deserves hard questions.
How much does a solar system cost by size?
Multiply system size in watts by the price per watt. For example, 8 kW at $3.00 is 8,000 × $3.00 = $24,000.
| System size | At $2.60/W | At $3.00/W | At $3.36/W | Rough yearly kWh (5 sun hours) |
|---|---|---|---|---|
| 4 kW | $10,400 | $12,000 | $13,440 | 5,690 |
| 6 kW | $15,600 | $18,000 | $20,160 | 8,540 |
| 8 kW | $20,800 | $24,000 | $26,880 | 11,390 |
| 10 kW | $26,000 | $30,000 | $33,600 | 14,240 |
| 12 kW | $31,200 | $36,000 | $40,320 | 17,080 |
The kWh column uses size × 5 sun hours × 365 × 0.78 for real-world losses. For a 6 kW system: 6 × 5 × 365 × 0.78 = about 8,540 kWh. Your sun hours may be higher or lower. Use our system size tool to match a size to your usage.
Larger systems usually cost a bit less per watt. Permits, design, sales and setup cost about the same for a 4 kW job as a 12 kW one, so those fixed costs get spread over more watts.
Where does your money go?
Many people assume the panels are most of the cost. They are not. Estimates vary, but a typical US home system breaks down roughly like this:
| Cost item | Rough share | On an $18,000 system |
|---|---|---|
| Solar panels | 12–18% | $2,200–$3,200 |
| Inverter(s) | 8–12% | $1,400–$2,200 |
| Racking, wiring, other parts | 8–12% | $1,400–$2,200 |
| Installation labor | 8–12% | $1,400–$2,200 |
| Soft costs: sales, permits, design, overhead, profit | 50–60% | $9,000–$10,800 |
Hardware is roughly 30% to 40% of the price. Soft costs are the rest. Sales and marketing alone can be a large slice, especially with door-to-door companies. This is why prices for the same equipment can differ by thousands of dollars between installers.
How much does a solar battery add?
A home battery around 13.5 kWh, a common size, usually costs about $11,000 to $17,000 installed. EnergySage's H1 2026 marketplace data puts the average near $15,647. That works out to about $15,647 ÷ 13.5 = $1,159 per kWh of storage.
Adding a battery to an $18,000 solar system can push the total past $33,000. A battery makes the most sense if:
- You want backup power during outages.
- Your utility pays little for exported power.
- You have time-of-use rates with expensive evenings.
Learn more in our home batteries guide, or size one with the battery sizer.
What makes a solar quote cost more or less?
Things that raise the price
- Complex roofs. Steep pitch, many angles, tile or slate add labor time.
- Microinverters or optimizers. They help shaded roofs but cost more than one central inverter.
- Premium panels. Top-efficiency panels cost more per watt. They matter most on small roofs.
- Electrical upgrades. An old or full main panel may need replacing, often $1,500 to $4,000. A licensed electrician must do that work.
- Ground mounts. These need trenching and a frame, which adds cost.
- High-pressure sales. Companies with big sales teams often charge more to pay commissions.
- Dealer fees on loans. Some "low-rate" solar loans hide a fee of 20% or more inside the price.
Things that lower the price
- Getting three or more quotes. Competition is the most reliable way to cut cost.
- A simple, south-facing roof with no shade.
- A larger system, which spreads fixed costs.
- Local installers with lower overhead.
- Paying cash or using your own loan from a bank or credit union.
- Local incentives, such as state tax credits or utility rebates.
Our solar quote checklist shows how to line up offers side by side.
Is there still a federal tax credit for solar?
Not for homeowners who buy. The 30% federal residential clean energy credit (25D) ended for systems installed after Dec 31, 2025. Per the IRS, the expense counts when installation is completed, so a 2026 install gets no 25D credit even if you paid in 2025.
That means a $18,000 system now costs the full $18,000, not $12,600 after a 30% credit. Some states still offer credits or rebates, and leased systems follow different rules. See what is left in our solar incentives guide.
How do you know if a quote is fair?
Use this quick check:
- Divide the total price by the system size in watts. Is it between about $2.60 and $3.36?
- Check the estimated yearly kWh. Is it close to size × your sun hours × 365 × 0.78?
- Look for line items such as panel upgrades, permits and roof work.
- For loans, ask for the cash price too. A big gap between cash and loan price points to a dealer fee.
Then weigh price against what you will save. Our is solar worth it guide shows the payback math for different states.
Frequently asked questions
How much does a 6 kW solar system cost in 2026?
About $15,600 to $20,160 before incentives, based on $2.60 to $3.36 per watt. At $3.00 per watt it is $18,000.
Why are solar quotes so different?
Most of the price is soft costs, such as sales, permits and overhead. Those vary a lot between companies, even when the panels and inverters are the same.
Are solar prices going down?
Hardware prices have fallen over the past decade, but soft costs have not dropped as fast. The end of the 25D credit means many homeowners now pay more out of pocket than in 2025.
Is a lease cheaper than buying?
A lease costs little or nothing up front, but you usually save less over 20 to 25 years than if you buy. Watch for yearly price increases built into the contract.
Does the battery price include installation?
The $11,000 to $17,000 range for about 13.5 kWh is for an installed battery. Extra wiring or a backup panel can add to that.
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