Photovoltaic system battery storage subsidy feed-in tariff?

gladly, I am interested in the invoice.

The background of the calculation is how often the storage can be filled and emptied again. In the example above, 7.7 kWh at €4800. Extremely positive but completely unrealistic would be 200 full charge cycles per year. At an average capacity of 80% over 20 years, that is 24,000 kWh that can be used. With an investment of €4800, that is 20 cents per kWh plus 11 cents of lost feed-in tariff, totaling 31 cents. However, realistically it is more like 70 charges and that the battery is dead after 15 years, then it is 86 cents per kWh.

Yes, that's how the calculation works, sometimes described in more detail and sometimes less detailed. The threads here are full of these calculation examples as soon as someone requests a storage. I trust the people here more than a solar installer who wants to sell me a battery!

Therefore, a storage system currently simply does not pay off for an average person (1st residential unit, no additional subsidies). It is an expensive but nice hobby if you can ignore the fact that the current electricity purchase price is much cheaper. There are only a few constellations where it actually makes financial sense, and one of them is when you can claim the 15k€ from [kfw153] for a 2nd residential unit.

Thank you for the breakdown. The calculation method is now clear to me. The basic assumptions make all the difference.

Hello everyone,
I had another appointment with the energy consultant. Based on our building plans, etc., he created a calculation that shows a battery storage system as not profitable as of today.
What, in his opinion, "could" pay off is that my air-water heat pump has a second power generator connection to heat the buffer tanks via the photovoltaic system. I will receive the calculation whether this makes sense or not at the next appointment.

Regards
Speer

I am looking forward to the calculation. Most of the electricity consumption is with an air-water heat pump when there is little sun. Of our approx. 3000kWh per year, at least 2000 fall on the months November to February. Aside from that, which buffer are we talking about? [WW] or heating?