Path-Q Solar
Does intermittent shade from a chimney create a meaningful solar production risk?
Answer
It can, but the effect depends on the chimney's height and position, the roof pitch and orientation, the time and season of shading, and how panels are electrically grouped. A small chimney may have little annual effect, while repeated shading during strong production periods can be material.
Key points
- The chimney's shadow changes with the sun's position and may be most important during particular seasons or hours.
- The affected panels and the system's electrical design determine whether losses are localized or spread more broadly.
- Panel placement can sometimes avoid the shadow without adding complex equipment.
- A time-based shade model is more reliable than judging the shadow at one time of day.
What it depends on
- Chimney height, width, and location
- Roof orientation and pitch
- Seasonal shadow path and duration
- Panel layout and power-electronics architecture
Risks and trade-offs
- Avoiding the chimney may reduce available panel area.
- Adding specialized equipment may mitigate some effects but increase cost and complexity.
- A production estimate that ignores intermittent shade may overstate output.
Information you may need
- Chimney and roof measurements
- Shade analysis by time and season
- Proposed panel grouping and equipment design
- Production comparison with and without the affected roof area
Your next step
What to do next
Ask for a shade study and two layouts—one avoiding the chimney shadow and one managing it electrically—with annual production and cost for each.
Path-Q
Find the right next step
Answer a few questions and we’ll narrow your options.
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