Energy performance index (EPI) chart

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.

Simulation is configured under System configuration > Calculations > Simulation. See Update: Simulation.

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