Path-Q Solar
How should I compare production from two roof sections with different orientations?
Answer
Compare normalized output rather than raw kilowatt-hours: divide production by each section's installed capacity and evaluate it against the section's orientation, tilt, shading, weather exposure, and expected solar resource. Different orientations can legitimately produce different daily peaks and annual totals.
Key points
- Use the same time period and account for each section's capacity and availability.
- Compare monthly and seasonal profiles, not only annual totals.
- Morning- or afternoon-oriented sections may peak at different times without indicating a fault.
- Persistent underperformance relative to a modeled or weather-adjusted baseline warrants inspection.
What it depends on
- Capacity and equipment grouping for each roof section
- Orientation, tilt, shading, and azimuth
- Monitoring resolution and data completeness
- Weather and model assumptions
Risks and trade-offs
- A simple capacity ratio can mislead when shading or inverter grouping differs.
- A modeled comparison may be wrong if the as-built layout is inaccurate.
- Combining sections can hide a localized failure.
Information you may need
- Section-level capacity and production
- As-built layout and orientation data
- Shading analysis and weather data
- Inverter or module-level monitoring records
Your next step
What to do next
Calculate monthly kilowatt-hours per installed kilowatt for each section and compare the results with a weather-adjusted design estimate.
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