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Greenbyte Documentation

Effective Power

On a solar PV site, there are inevitably going to be energetic losses between the site's inverters and the site's meters. An inverter's Effective Power represents how much of the inverter’s power output is reaching the inverter's primary meter, that is, what's left after the energy losses between the inverter and meter. This is useful since it acknowledges that the current Power AC of the inverter, as measured by the inverter, does not reflect the reality of its output to the Grid.

The Effective Power signal associates the portion of primary meter power to individual inverters based on the output of that inverter and all inverters. This calculation takes energy losses between the primary meter and inverter into account and backward calculates them to the inverter level:

Effective_Power_-_Description.png
Technology

Solar

Remarks

This is an inverter-level signal, used as an input signal for Production-based availability (inverter-normalized).

In order for Effective power to have a value, it must follow the Rules for Referencing Devices that concerns Primary meter mapping.

Equation
Effective_Power_-_Equation.png

Where:

Peffective

is the Effective Power

Piz

is the Power with fallback Energy or Power with Fallback for inverter i, of all inverters mapped to the same primary meter, with fallback to 0 if undefined

Pz

is the Power with fallback Energy or Power with Fallback for the inverter, with fallback to 0 if undefined

Pmeter

is the inverter’s primary meter Energy export, converted to power

T

is the device resolution in hours

EGrid

is the Grid Meter Energy export

EGMS

is the GMS Energy export (Production meter)

Inputs
Effective_Power_-_Inputs.png
Usage Example

Effective Power is plotted against Power AC from a single inverter. As you can see, Effective Power is lower than the Power AC since it does not include the energetic losses between the site's inverters and the site's meters:

Effective_Power_-_Usage_Example_1.png
Effective_Power_-_Usage_Example_2.png