PerformanceUp to date · Jan 15, 2026
System Availability
The percentage of time a power system (solar, battery, generator) is operational and available to produce energy. Well-maintained residential solar achieves 98-99% availability over its lifetime.
Why It Matters
Inverter failures are the most common cause of downtime. Monitoring systems that alert you to production drops help maintain high availability and protect your investment.
Related Tools
Related Terms
Performance Ratio (PR)
The percentage of a solar system's theoretical maximum output that is actually achieved, accounting for all real-world losses (temperature, shading, soiling, wiring, inverter). Typical: 75-85%.
Capacity Factor
The ratio of actual energy produced by a system to its maximum potential output. Solar typically has a 15-25% capacity factor.