What is a good cost per watt for solar in 2026?

A good price is under $2.70/W in competitive markets like Texas, Arizona, or Florida. The national average is $2.50-$3.20/W installed. Anything above $3.50/W warrants additional quotes unless you are in a high-cost market like New York City or Hawaii.

What does cost per watt include?

The $/W figure covers the entire installed system: solar panels, inverter(s), racking and mounting hardware, wiring, labor, permitting fees, and the installer's margin. It does not include the federal tax credit — always compare pre-credit $/W numbers across quotes.

Why is the installed cost per watt so much higher than the panel cost?

Panels themselves cost only $0.25-$0.65/W. The remaining $2.00-$2.55/W covers the inverter ($0.20-$0.40/W), racking ($0.10-$0.20/W), labor ($0.50-$1.00/W), permitting ($0.10-$0.30/W), and soft costs like overhead, customer acquisition, and profit margin ($0.50-$1.00/W).

How has solar cost per watt changed over time?

Solar panel costs have dropped from $76/W in 1977 to roughly $0.30/W for panels alone in 2026 — a 99.6% decline. Installed system costs have fallen from over $12/W in 2006 to $2.50-$3.20/W today. The decline has slowed recently because hardware is already cheap and soft costs now dominate.

Does system size affect cost per watt?

Yes. Larger systems have a lower $/W because fixed costs like permitting, truck rolls, and design work are spread over more watts. A 4 kW system might cost $3.40/W while a 10 kW system could be $2.60/W from the same installer.

Should I compare quotes using total cost or cost per watt?

Always compare using $/W because it normalizes for system size. A $20,000 quote for 8 kW ($2.50/W) is a better deal than a $16,000 quote for 5 kW ($3.20/W), even though the total cost is higher. After comparing $/W, also compare equipment quality, warranty terms, and production guarantees.

Does the federal tax credit affect the cost per watt?

The 30% federal Investment Tax Credit (available through 2032) reduces your effective cost per watt by 30%. A system at $3.00/W becomes $2.10/W after the credit. However, industry convention is to quote and compare pre-credit $/W so all quotes use the same baseline.

What is the cheapest state for solar per watt?

Arizona, Texas, and Florida consistently have the lowest installed costs at $2.30-$2.60/W due to high installer competition, streamlined permitting, and strong solar markets. California is also competitive at $2.50-$2.80/W despite higher labor costs because of intense competition.

Solar Panel Cost Per Watt: What Is A Good Price In 2026?

Cost per watt ($/W) is the single most important number when comparing solar quotes. It normalizes the total installed price by system size, letting you compare a 5 kW quote against an 8 kW quote on equal footing. In 2026, the national average ranges from $2.50/W in competitive Sun Belt markets to $3.20/W in high-cost northeastern states. After the 30% federal tax credit, the effective cost drops to $1.75-$2.24/W.

What Cost Per Watt Actually Means

When a solar installer quotes "$2.85 per watt," they mean the total installed cost of your system divided by its rated DC wattage. For a 7 kW (7,000 watt) system at $2.85/W, your total price before incentives is $19,950.

This single metric captures everything: panels, inverter, racking, wiring, labor, permits, engineering, overhead, and the installer's profit margin. It is the standard comparison metric across the entire residential solar industry, and you should insist on seeing it on every quote you receive.

One important caveat: $/W figures are always quoted before the federal tax credit. This is industry convention, and it makes quotes comparable. Your actual out-of-pocket cost will be 30% lower after claiming the Section 25D credit (available through 2032).

State

System size

Estimated cost (after 30% tax credit)

5 kW system in California at $3.00/W

Before tax credit

$15,000

Range: $12,750 – $17,250

Cost per watt

$3.00/W

California average

After 30% ITC

$10,500

Range: $8,925 – $12,075

California incentives

• Net billing (NEM 3.0)
• SGIP battery rebate
• DAC-SASH low-income program
• Property tax exclusion

Payback calculator Cost by state

Panel-Only Cost Vs. Installed Cost

There is a massive difference between what a solar panel costs by itself and what it costs to get it producing electricity on your roof. Understanding this gap is key to evaluating quotes.

Panel-only cost: $0.25-$0.65/W. A standard 410 W Tier 1 panel (LONGi, Canadian Solar, Trina) costs $100-$170 wholesale. Premium panels (REC, Maxeon) run $180-$270. Either way, the panel itself is only 10-20% of your total installed cost.

Installed cost: $2.50-$3.20/W. The remaining 80-90% goes to everything else needed to turn panels into a working power plant on your roof.

Where Your Money Goes: The Cost Breakdown

Here is how the typical $2.85/W installed cost breaks down:

Component	Cost Per Watt	% Of Total	What It Covers
Solar panels	$0.30-$0.65	~15%	Photovoltaic modules
Inverter(s)	$0.20-$0.40	~10%	String inverter or microinverters
Racking and BOS	$0.15-$0.25	~8%	Mounting hardware, wiring, conduit
Installation labor	$0.50-$1.00	~25%	Crew, electrical work, commissioning
Permitting and inspection	$0.10-$0.30	~7%	Building permits, plan review, inspections
Soft costs	$0.50-$1.00	~35%	Sales, design, overhead, profit, customer acquisition

The dominant cost category is soft costs — everything that is not hardware or labor. This is why US solar costs remain higher than in countries like Australia or Germany, where streamlined permitting and lower customer acquisition costs cut soft costs significantly.

How System Size Affects $/W

Smaller systems cost more per watt because many costs are fixed regardless of system size. Permitting costs the same whether you install 4 kW or 12 kW. The truck roll, site survey, and design engineering are nearly identical. These fixed costs get divided across fewer watts in a small system, pushing $/W higher.

System Size	Typical $/W Range	Total Cost (Pre-Credit)	After 30% ITC
4 kW	$3.20-$3.60	$12,800-$14,400	$8,960-$10,080
6 kW	$2.80-$3.20	$16,800-$19,200	$11,760-$13,440
8 kW	$2.60-$3.00	$20,800-$24,000	$14,560-$16,800
10 kW	$2.50-$2.85	$25,000-$28,500	$17,500-$19,950
12 kW	$2.40-$2.75	$28,800-$33,000	$20,160-$23,100

This is why right-sizing matters. You want a system large enough to cover your electricity usage so the $/W drops into the sweet spot, but not so large that you are exporting power you cannot get credit for (especially in states with poor net metering policies).

Historical Price Trends

The cost decline in solar is one of the most dramatic in energy history:

Year	Panel Cost ($/W)	Installed System Cost ($/W)
1977	$76.00	N/A (not commercial)
2000	$4.00	$12.00+
2006	$3.50	$8.80
2010	$1.80	$6.20
2014	$0.70	$3.70
2018	$0.40	$3.00
2022	$0.30	$2.80
2026	$0.25-$0.35	$2.50-$3.20

Panel prices have fallen 99.6% since 1977, driven by manufacturing scale, silicon cost reductions, and efficiency improvements. However, installed system costs have flattened over the past five years because panel hardware is now a small fraction of total cost. Further reductions will need to come from soft cost compression — faster permitting, better sales processes, and reduced customer acquisition costs.

What Counts As A Good Price In 2026

Your target $/W depends on where you live:

Under $2.50/W — Excellent. Possible in Texas, Arizona, Florida, and other competitive markets with large-volume installers. At this price point, make sure you are not sacrificing equipment quality or warranty terms.

$2.50-$2.80/W — Very good. Achievable in most Sun Belt states and competitive metro areas across the country.

$2.80-$3.00/W — Average. This is the national median. A fair price in most markets, though you should still get three or more quotes to make sure.

$3.00-$3.20/W — Above average. Common in the Northeast and states with complex permitting like New York, New Jersey, and Massachusetts. The higher electricity rates in these states still make solar worthwhile despite the premium.

Above $3.20/W — Expensive. Unless you are in Hawaii or a particularly difficult installation (steep roof, main panel upgrade required, complex shading), you should shop around further. Get at least five quotes.

What Makes $/W Vary Between Quotes

When you get three quotes and one is $2.60/W while another is $3.30/W, the difference usually comes down to a few factors.

Equipment tier. Premium panels (REC Alpha, Maxeon) with microinverters (Enphase IQ8+) cost $0.30-$0.50/W more than budget panels with a string inverter. The premium equipment typically comes with better warranties (25-year product vs. 12-year) and slightly higher efficiency.

Installer overhead. National companies with large sales teams and heavy advertising spend more on customer acquisition, which gets baked into $/W. Local installers with referral-based businesses often offer lower prices for the same equipment.

Roof complexity. A simple south-facing roof with easy access is straightforward. Multiple roof planes, steep pitch, tile roofing, or required electrical panel upgrades all add cost.

Permitting jurisdiction. Some cities charge $500+ in permit fees and require multiple inspections. Others charge $100 and inspect once. This directly affects $/W.

How The Federal Tax Credit Affects Your Effective $/W

The 30% federal Investment Tax Credit (Section 25D) is available for residential solar systems installed through 2032. It steps down to 26% in 2033 and 22% in 2034.

The credit applies to your total installed cost, including equipment, labor, and even a battery if you add one. For a system quoted at $2.85/W:

Pre-credit cost: $2.85/W
30% ITC: -$0.86/W
Effective cost: $2.00/W

At $2.00/W effective, a 7 kW system nets out to about $14,000 — and it will produce electricity for 25-30 years. This is what makes solar such a strong financial proposition in most US markets.

Tips For Getting The Best $/W

Get at least three quotes. This is the single most effective way to get a better price. Installers know you are shopping and will sharpen their pencils.

Compare apples to apples. Make sure quotes use similar equipment tiers. A $2.50/W quote with budget panels is not necessarily better than a $2.80/W quote with premium panels and microinverters.

Ask about the production guarantee. A lower $/W means nothing if the system underproduces. Good installers guarantee a minimum annual kWh production.

Check the $/W after removing any dealer fees. Some loan programs embed dealer fees (1-3%) that inflate the $/W. Ask for the cash price separately.

Consider timing. Late fall and winter are the slow season for installers in northern states. You may get better pricing during these months.