Path-Q Solar
How much can seasonal snow cover reduce annual solar savings?
Answer
Seasonal snow can reduce annual solar savings by the portion of production lost while panels are covered, but the effect varies widely. It depends on snow depth, how long snow remains, panel angle, weather after the storm, access for melting or shedding, and whether snow also shades the array.
Key points
- Short-lived snow may have a modest annual effect, while persistent or repeated cover during high-production periods can have a larger effect.
- Snow can sometimes slide or melt naturally from sloped panels, but this is not guaranteed.
- Annual savings estimates should use local snowfall and snow-retention assumptions rather than a single generic reduction.
What it depends on
- Local snowfall frequency and persistence
- Panel tilt, orientation, mounting height, and spacing
- Winter solar resource and household electricity use
- Whether snow removal is practical and safe
Risks and trade-offs
- Snow-removal work can damage panels, racking, roofs, or people if performed unsafely.
- Removing snow may cost more than the electricity recovered.
- A snow-covered array may also create uneven production or temporary inverter shutdowns.
Information you may need
- Local snow-depth and persistence history
- Array layout and tilt
- Monthly production estimate
- Observed snow coverage and production data if the system is installed
Your next step
What to do next
Use local weather data and the array's winter production estimate to model lost production during typical and severe snow periods.
Path-Q
Find the right next step
Answer a few questions and we’ll narrow your options.
Loading…
SQ00838