Balcony Solar ROI in Seattle, WA (South)
Free 800W payback calculator with PVGIS solar data for Seattle
Published January 1, 2025 · Last updated: July 3, 2026
Calculate your 800W balcony solar payback in Seattle with south-facing panels. Our calculator uses official PVGIS irradiance data for Seattle, Washington to estimate annual production, electricity savings, and return on investment based on your local sun exposure and utility rates.
Assumptions: 70% self-consumption, $0.13/kWh average rate, ~$1,500 system cost (before 30% federal ITC), 14% system losses. Click Calculate below for your personalized results.
In Seattle, Washington, latitude 47.6°N yields roughly 1000 kWh/kWp/year from PVGIS data. With south-facing panels, a realistic 800W balcony system produces about 688 kWh/year before the 30% federal tax credit.
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West and east facing output is available in the main calculator — no separate SEO pages.
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FAQ – Seattle Balcony Solar
How much can an 800W balcony solar system produce in Seattle?
An 800W south-facing system in Seattle, Washington typically generates 619–757 kWh per year depending on shading and tilt. Use the calculator below for a precise PVGIS-based estimate.
Is plug-in balcony solar legal in Washington?
Rules vary by utility in Washington. Many areas allow UL 1741-listed plug-in systems with utility registration. See our plug-in solar legal by state guide and Washington incentives page.
What is the payback period for balcony solar in Seattle?
At typical Washington electricity rates (~$0.13/kWh), an 800W system in Seattle often pays back in 21–29 years before the 30% federal tax credit.
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