Active Energy injected into grid

What this step does

The last line of the solar part of the diagram: the energy delivered at the grid connection over the year before any battery, net of the night draws. In kWh/kWp the row is the specific yield. Divided by the reference yield, the plane irradiation divided by 1 kW/m², it gives the performance ratio.

The math

$$E_{grid} = E_{inv} + \sum_k \Delta E_k \tag{1}$$

where

Symbol	Meaning	Unit
$E_{grid}$	the energy delivered to the grid	kWh/kWp
$E_{inv}$	the energy at the inverter output	kWh/kWp
$\Delta E_k$	the AC rows between the two, losses negative	kWh/kWp

Reading the number

A total, positive: the specific yield, about 1,200 to 2,200 kWh/kWp a year for a utility plant and 900 to 1,500 kWh/kWp for a rooftop system, set by the site's sunlight and every row above it. Auxiliaries and transformer losses sized for a larger plant can take it to zero or below on a small system; the run then warns in summary.warnings.

References

1. IEC 61724-1:2021, Photovoltaic system performance, Part 1: monitoring (performance ratio and yields)

API

loss.eout_grid

Symbols follow the symbol registry.