# How is the self-consumption rate calculated on MyDualSun?

During a simulation on MyDualSun, the self-consumption rate of the project is estimated by the software.

This is calculated by the simulator on the basis of a daily electricity consumption profile giving the average hourly consumption of the building

## Calculation of the self-consumed energy

The simulator will determine the amount of electricity produced by the solar panels that is consumed in the building for each hourly step of the consumption profile.

This is the "amount of self-consumed electricity" in the building.

It will compare the instantaneous solar production, obtained from the meteorological data of the project, and the instantaneous consumption calculated with the profile.

## Calculation of the surplus energy injected into the grid

When the instantaneous production is higher than the instantaneous consumption, there is then a "surplus" of solar production and this surplus is injected into the electricity grid. The simulator can then also calculate the "quantity of electricity sold to the grid".

The simulator then adds up over the year:

• The amount of electricity consumed by the solar energy system
• The amount of electricity resold

These are the quantities that are displayed on the diagram on the results page.

## Calculation of the self-consumption rate

Self-consumption rate = Annual quantity of self-consumed electricity cumulated / Annual total photovoltaic production cumulated

NB 1: In the case of a pool heating simulation, the presence of the pool water filtration pump allows to consume a larger part of the photovoltaic production since this pump consumes additional electricity during the day.

NB2: To refine the rate of self-consumption, a separate study can be carried out with the precise data of the project, by superimposing the production and consumption curves.

This then allows to manually modulate the self-consumption rate in MyDualSun.

What is MyDualSun?