PV performance metrics & concepts

The solar-plant metrics that actually decide yield, contracts, and warranty standing — defined plainly, with the formulas, typical ranges, and how NuraVolt tracks each one.

Performance Ratio (PR)

The headline efficiency number for a PV plant, independent of weather.

Temperature-corrected Performance Ratio

PR with the weather’s heat penalty removed, so real losses stand out.

Specific yield (kWh/kWp)

Energy produced per unit of installed capacity — the cross-site comparator.

Capacity Utilisation Factor (CUF)

The share of nameplate a plant actually delivered over time.

Plant availability

How much of the time the plant was actually able to produce.

Energy Performance Index (expected vs actual)

Actual generation measured against a physics model of what the plant should have made.