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Energy performance index (EPI)

Chart

PV yield counter -  energy performance index

Basic info

Description

The energy performance index is the ratio between a system’s actual yield and simulated yield. Ideally, the value should be as close to 100% as possible. The simulated yield is calculated based on a daily irradiation value at the module level, module temperature, and the technical properties of the components, such as inverter characteristics or module efficiency.

Prerequisites

Simulation is configured under System configuration (wrench icon) > Calculations > Simulation. See Simulation and solar power chart.

Relevant chart

Energy performance index chart

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