Solar Panels in Seattle, WA
Seattle gets 3.2 peak sun hours/day with electricity at $0.115/kWh. Calculate panels needed, installed cost, and payback period (updated for 2026 — no federal credit).
☀️ Seattle Solar Calculator
System Sizes in Seattle
| Monthly kWh | Panels | kW | Installed Cost | Savings/yr | Payback |
|---|---|---|---|---|---|
| 500 | 17 | 6.8 | $20,060 | $731 | 27.4 yrs |
| 750 | 25 | 10.0 | $29,500 | $1,075 | 27.4 yrs |
| 1,000 | 33 | 13.2 | $38,940 | $1,418 | 27.5 yrs |
| 1,500 | 49 | 19.6 | $57,820 | $2,106 | 27.5 yrs |
| 2,000 | 66 | 26.4 | $77,880 | $2,837 | 27.5 yrs |
| 2,500 | 82 | 32.8 | $96,760 | $3,525 | 27.4 yrs |
Solar Guide for Seattle (2026)
Seattle at latitude 47.61°N receives 3.2 peak sun hours/day. At $0.115/kWh, solar offers solid long-term savings.
Incentives: Federal ITC + sales tax exemption.
NEC Solar Requirements
All installations must comply with NEC Article 690: rapid shutdown (690.12), conductor sizing at 125% (690.8), and proper grounding per NEC 250. Use our Solar Wire Size Calculator for conductor sizing.
Disclaimer: Estimates only. Consult a licensed solar installer. NEC Article 690 compliance required.
Frequently Asked Questions
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See also: Solar in Washington