The calculations of self-consumption and independence are based on an algorithm that basically performs the following function: The values of the simulated production profile are overlaid with the selected consumption profile (e.g., single-family detached house – oil, gas, wood) in 15-minute resolution.
The following is evaluated for each quarter-hour value:
- What is the production?
- How much is fed in?
- How much is consumed directly?
- How much electricity is drawn from the grid?
By adding up the corresponding quarter-hourly values, the annual totals of grid consumption and direct consumption are calculated.
Based on this, the percentage independence is calculated as follows:
Independence = (total electricity consumption – grid purchase) / total electricity consumption.
The percentage of self-consumption is calculated as follows.
Self-consumption = (direct consumption + opt. intermediate storage battery) / total production
To ensure a correct calculation of self-consumption and independence, it is important that the correct annual consumption is specified for the simulation.