Solar panel inspection in Washington
Washington (WA)
Washington is in a temperate climate zone with an average of 3.4 peak sun hours per day. Soiling risk is low, and solar adoption is moderate. Here's what WA solar owners should watch for.
Climate zone
temperate
Avg sun hours
3.4 hrs/day
Soiling risk
low
Solar adoption
moderate
Common issues in Washington
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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