Solar Panel Cost in Seattle, WA
Estimated costs and savings for ZIP code 98104 — updated for 2026
Urgent tax credit deadlines
- Section 48E phase-out completes December 31, 2027 — the last date to begin construction; grandfathered 2026 starts have until Dec 31, 2030 to be placed in service (421 days left).
Gross Cost
$20,160
7kW system
Annual Savings
$1,201
$100/month
Payback Period
16.8 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 98104. Costs based on WA average of $2.88/W and utility rate of $0.15/kWh.
| System | Cost | Savings/yr | Payback |
|---|---|---|---|
| 4 kW | $12,163 | $687 | 17.7 yrs |
| 5 kW | $14,829 | $858 | 17.3 yrs |
| 6 kW | $17,494 | $1,030 | 17 yrs |
| 7 kW(typical) | $20,160 | $1,201 | 16.8 yrs |
| 8 kW | $22,826 | $1,373 | 16.6 yrs |
| 10 kW | $28,157 | $1,716 | 16.4 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
$0.15/kWh
Above-average rates — good solar savings potential
Cost Per Watt in WA
$2.88/W
Below national average — competitive market
Solar Panel FAQ — Seattle, WA
How much do solar panels cost in Seattle, WA?
A typical 7kW solar system in Seattle, WA (ZIP 98104) costs approximately $20,160 before any incentives. This works out to about $2.88 per watt installed. Smaller systems start around $11,520, while larger 10kW systems can cost up to $28,800.
How long is the solar payback period in Seattle?
The average solar payback period in Seattle, WA is approximately 16.8 years for a 7kW system. With estimated annual savings of $1,201, 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 98104?
Homeowners in Seattle, WA (ZIP 98104) can save approximately $100 per month or $1,201 per year with a standard 7kW solar system. Over 25 years, total savings can exceed $30,025, 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 98104.
Solar Tools for Washington
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