On the page Financial Analysis all information required for the economic efficiency calculation such as costs, subsidies and electricity tariffs are defined.
To enter the parameters for calculating the profitability of grid-connected systems:
Use button to enter the economic efficiency parameters.
Select a balancing or feed-in concept of the PV system
You can choose between the following feed-in concepts:
Full feed-in With a full feed-in, the entire electrical energy generated by the PV system is fed into the public power grid. There is no own consumption. The profitability of the plant depends directly on the amount of the feed-in tariff or the proceeds from direct marketing. The full supply can only be selected for grid-connected PV systems without electrical loads.
Surplus supply In the event of an excess supply, the electrical energy generated by the PV system is used for the electrical consumers, battery systems or electric vehicles as far as possible. Only the energy that cannot be used is fed into the power grid. The current consumption and the feed into the grid are measured via two separate meters. The profitability of the PV system results from savings in electricity purchases and feed-in tariffs.
Net Metering As with the surplus feed-in, the electrical energy generated is primarily used for self-sufficiency. The unused electricity is fed into the power grid via a double-tariff meter and offset against the electricity purchased. The tariff counter rotates backwards. If more solar power is generated than consumed in the billing period, the surplus can be carried forward as a balance to the next billing period.
The feed-in tariff can consist of different feed-in tariffs with different validity periods.
To enter the parameters for the profitability calculation: