Path-Q Solar
How much solar electricity should I expect from my system each year?
Answer
Use the system's site-specific production model as the starting estimate, not the panel nameplate rating alone. Annual output depends on system size, orientation, tilt, shading, local sunlight, temperature, snow or dust, inverter and wiring losses, availability, and degradation.
Key points
- A credible estimate should show monthly and annual production, assumptions, shading, losses, and uncertainty.
- Nameplate capacity describes peak rated power, not annual energy.
- Compare expected production with household demand and the system's intended offset.
What it depends on
- Panel and inverter capacity
- Roof orientation, tilt, shading, and weather
- System availability, losses, and degradation assumptions
Risks and trade-offs
- A single annual figure can hide seasonal variation and unfavorable weather.
- Actual production may be lower because of shading, outages, soiling, snow, or modeling error.
Information you may need
- System design and equipment specifications
- Site-specific production report and assumptions
- Utility bills or expected electricity consumption
Your next step
What to do next
Request the monthly production model and compare it with monitoring data once the system operates through representative seasons.
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SQ01783