Solar Panels in Seattle, WA

Seattle gets 3.2 peak sun hours/day with electricity at $0.115/kWh. Calculate panels needed, cost after 30% ITC, and payback period.

Sun Hours
3.2/day
Rate
$0.115/kWh
Cost/Watt
$2.95
Net Metering
Yes

☀️ Seattle Solar Calculator

8,261 kWh
Panels
269
System Size
107.6 kW
Annual kWh
100,541
Net Cost
$222,194
Savings/yr
$11,562
Payback
19.2 yrs
25-Yr Savings
$66,856

System Sizes in Seattle

Monthly kWhPanelskWNet CostSavings/yrPayback
500176.8$14,042$73119.2 yrs
7502510.0$20,650$1,07519.2 yrs
1,0003313.2$27,258$1,41819.2 yrs
1,5004919.6$40,474$2,10619.2 yrs
2,0006626.4$54,516$2,83719.2 yrs
2,5008232.8$67,732$3,52519.2 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

See also: Solar in Washington