The financial returns consist of the savings from prevented purchase of electricity, i.e., self-consumption*electricity consumption tariff, and the income from the sale of electricity, i.e., feed-in quantity*feed-in tariff. This applies to predefined tariffs selected from the dropdown in the project as well as to manually entered tariffs. When using double tariffs (high and low tariffs), the savings and revenues flow into the simulation by overlapping with the production profile to the hour.
In the case of manually entered tariffs, it is also possible to define performance tariffs and charges for load profile meters. Any savings from lower chargeable power tariffs are considered if the installation of a PV system leads to a reduction in peak loads. The fees for load profile meters are only considered for systems > 30 kWp and are calculated as an additional expense, i.e., a reduction in income.
Also considered are the annual inflation of electricity and feed-in tariffs as well as the annual maintenance costs of the PV system and the battery storage (if one is included). You can set these parameters individually per project. Please contact our customer support or your customer advisor if you would like to adjust the default values of these parameters.
It is important to bear in mind that the average annual yield is output on the offers. The yields (according to the above calculation) are therefore accumulated over the lifetime of the PV system (e.g., 25 years). With positive inflation rates, this often leads to slightly increasing annual yields. The accumulated yields are then in turn divided by the lifetime of the PV system and shown as the average annual yield.