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Solar Panel Cost in Seattle, WA

Estimated costs and savings for ZIP code 98102 — updated for 2026

Urgent tax credit deadlines

  • Section 30D EV credit (up to $7,500) — expires June 30, 2026 (12 days left).
  • Section 48E solar ITC safe harbor — construction must start by July 4, 2026 (16 days left).
See the full deadline tracker

Gross Cost

$21,700

7kW system

Annual Savings

$1,527

$127/month

Payback Period

14.2 yrs

Break-even

Peak Sun Hours

3.7

hrs/day avg

Solar System Cost Breakdown — Seattle, WA

Estimated costs and savings for different residential solar system sizes in ZIP 98102. Costs based on WA average of $3.10/W and utility rate of $0.19/kWh.

System Cost Savings/yr Payback
4 kW $12,400 $872 14.2 yrs
5 kW $15,500 $1,091 14.2 yrs
6 kW $18,600 $1,309 14.2 yrs
7 kW (typical) $21,700 $1,527 14.2 yrs
8 kW $24,800 $1,745 14.2 yrs
10 kW $31,000 $2,181 14.2 yrs

Solar Production in Seattle, Washington

Average Peak Sun Hours

3.7 hours/day

Lower solar resource — longer payback but still viable

Est. Annual Production (7kW)

8,035 kWh

Based on 3.7 PSH × 7kW × 365 days × 85% efficiency

Average Utility Rate

$0.19/kWh

High utility rates make solar especially valuable

Cost Per Watt in WA

$3.10/W

Near national average for installed cost

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Solar Panel FAQ — Seattle, WA

How much do solar panels cost in Seattle, WA?
A typical 7kW solar system in Seattle, WA (ZIP 98102) costs approximately $21,700 before any incentives. This works out to about $3.10 per watt installed. Smaller systems start around $12,400, while larger 10kW systems can cost up to $31,000.
How long is the solar payback period in Seattle?
The average solar payback period in Seattle, WA is approximately 14.2 years for a 7kW system. With estimated annual savings of $1,527, the system pays for itself and then generates free electricity for the remaining 15-20+ years of its lifespan.
How much can I save with solar panels in 98102?
Homeowners in Seattle, WA (ZIP 98102) can save approximately $127 per month or $1,527 per year with a standard 7kW solar system. Over 25 years, total savings can exceed $38,175, depending on utility rate increases.
How many peak sun hours does Seattle get?
Seattle, WA receives an average of 3.7 peak sun hours per day. This is below the national average, making solar still viable but with longer payback in this area.
What size solar system do I need for my home in Seattle?
The average home in Seattle, WA needs a 7kW solar system to offset their electricity usage. The exact size depends on your monthly electric bill, roof orientation, and available space. A 7kW system would produce approximately 8,035 kWh annually in ZIP 98102.

Solar Tools for Washington

ROI Calculator

Exact payback analysis

System Sizer

Find your ideal kW

Incentive Finder

WA rebates & credits

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