How much is a 3kw solar energy system worthwhile?
How much a 3kw solar energy system pays off for you depends on several factors. Strongest of the price at which you buy a PV system. But the amount of the operating costs, the yield of the system and whether you feed the electricity completely into the power grid or use it yourself are also decisive. Subsidy programs also help to reduce investment costs.
3kw solar energy system for self-consumption
3kw solar energy system have been installed as self-consumption systems for more than ten years. You use as much of your own electricity as possible and feed the part that you cannot use into the power grid. It's worth it because your own electricity only costs you around 12 to 16 cents per kilowatt hour, while you pay at least twice as much for electricity from the grid. At 35 cents per kilowatt hour for electricity from the grid, you can easily save 19 to 23 cents per kilowatt hour with your own solar power.
The fact that the electricity supplied is about three times as expensive as the electricity you generate yourself is due to taxes, levies, levies and charges. You have to pay this via the electricity price if the energy flows via the public supply network. On the other hand, there are no taxes, electricity taxes, grid fees or surcharges on your own consumption. You only have to pay sales tax on your own consumption if you are subject to standard taxation. You can be exempt from income tax since 2021 if some requirements are met. In the Annual Tax Act 2022, it is planned to extend the regulations for exemption from income tax from 2023. The sales tax on 3kw solar energy system on buildings should even drop to zero.
For the residual electricity that you feed into the power grid, you can claim the feed-in tariff according to the Renewable Energy Sources Act (EEG). The network operator pays you for 20 years. Higher rates than before have applied since July 30, 2022. In addition, the EEG now distinguishes whether you feed all of the electricity into the power grid or use part of it yourself or supply it directly to others, such as tenants in the house or your neighbors, without using the public power grid to use for transportation.
If you do not feed all of the solar power into the public power grid, the following rates apply to systems that go into operation after July 30, 2022:
for the first 10 kilowatts of power 8.2 cents per kilowatt hour
for further output up to a total of 40 kilowatts 7.1 cents per kilowatt hour
for additional output up to a total of one megawatt, 5.8 cents per kilowatt hour.
8.2 cents for a small roof system is less than it costs you to generate it. But the savings in self-consumption can still add up for you. The prerequisite is that you have purchased the system at a reasonable price. In 2022 you should not pay more than 1,700 euros per kilowatt of power (net). The cheapest small 3kw solar energy system cost 1,200 euros per kilowatt of output (net).