Key performance indicators for evaluating solar array efficiency and output
12 essential metrics for comprehensive solar performance evaluation
Actual output vs. theoretical output. Industry standard for system efficiency, typically 75-90%.
Total energy production per kilowatt of installed capacity (kWh/kWp), measured daily, monthly, or annually.
Ratio of actual output to maximum possible output. Canadian averages: 12-18% depending on location.
Overall conversion efficiency from sunlight to electrical output, accounting for all system losses.
Power loss per degree above 25°C. Typical values: -0.4% to -0.5% per °C for crystalline silicon.
Output reduction due to panel surface contaminants. Varies by location, season, and cleaning frequency.
Power reduction from obstructions. String-level monitoring identifies time-of-day shading patterns.
Winter-specific metric for Canadian installations. Significant in northern regions, minimal in coastal areas.
Percentage of time system operates without faults. Target: >98% for well-maintained installations.
Annual decline in maximum output. Typical: 0.5-0.8% per year for crystalline silicon panels.
DC to AC conversion efficiency. Modern inverters achieve 96-98% efficiency at rated capacity.
Equivalent hours of 1000 W/m² irradiance. Varies by location: 3-5 hours daily in Canada.
Average capacity factors across Canadian provinces