Greenbyte Documentation

Effective Power

Description

On a solar PV site, there are inevitably going to be energetic losses between the site's inverters and the site’s grid meter. An inverter’s effective power represents how much of the inverter’s power output is reaching the grid meter (i.e. what’s left after energetic losses between the inverter and the grid meter). The effective power signal accounts for these losses by looking at the actual exported energy at the grid meter and then dividing this value between the site’s inverters.

Note

This signal only works when there is a grid meter installed at the site. If there are several grid meters at a site, then the total sum of energy at all grid meters is used in the calculation.

Technology

Solar

Equation

effective_power_eq1.png

where

Peffective is the effective power

Pinv,sum is the sum of all the site inverters' power AC

Pgridmeter,sum is the sum of all of the site's grid meter energy export, converted to power (using the grid meter's device resolution)

P is the power AC from the inverter with a fallback to the inverter's Energy (E):

effective_power_eq2.png

where

E is the inverter's energy

T is the device resolution in hours

PAC is the power AC from the inverter

Inputs

effective_power_inputs.png

Usage Example

Here plotted in data studio together with the power AC

effective_power_usage.png