Solar panel inspection in Seattle, WA
Seattle, Washington
Seattle is located in Washington, a temperate climate zone with an average of 3.4 peak sun hours per day. Solar owners in Seattle should be aware of relatively low soiling, though periodic cleaning is still recommended. Degradation rates in Seattle are generally in line with national averages.
Climate
temperate
Sun hours
3.4 hrs/day
Soiling risk
low
State
Washington
Common issues in Seattle
Inverter efficiency loss
Degradation or malfunction in the inverter reducing DC-to-AC conversion efficiency. Often indicated by error codes or unexpected shutdowns.
Typical loss: 5–25%
Natural panel degradation
All solar panels lose efficiency over time at roughly 0.5–0.8% per year. Accelerated in extreme heat or poorly manufactured panels.
Typical loss: 3–15%
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Based on conservative solar performance modelling and published degradation data
Updated April 2026 · Structured performance modelling
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