Path-Q Solar
How does snow remaining on panels affect annual solar production?
Answer
Snow reduces or can temporarily eliminate production while it covers the active panel surface; the annual effect depends mainly on how often snow accumulates, how long it remains, panel tilt, temperature, wind, and whether melting or sliding clears the array.
Key points
- Short-lived, partial coverage may have a small annual effect, while repeated or persistent coverage can have a larger one.
- Snow can also affect access, equipment loading, and roof drainage considerations.
- Panel tilt, sunlight, wind, and temperature influence natural clearing.
- Production models should include a reasonable local snow-loss assumption rather than assuming all snow clears immediately.
What it depends on
- Snowfall frequency, depth, and persistence
- Panel tilt, roof design, and exposure
- Local temperature, wind, and shading
Risks and trade-offs
- Estimating snow loss too optimistically can overstate annual production.
- Snow sliding from panels may create a safety or property hazard.
- Attempts to clear snow can damage panels or expose someone to fall hazards.
Information you may need
- Local snow history
- Proposed panel tilt and layout
- Production model's snow-loss assumptions
Your next step
What to do next
Ask the provider to identify the snow-loss assumption and compare it with local snow persistence and the proposed roof geometry.
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