Is a solar system with batteries worth it?

The essence of the balance system was that we could replace the consumed energy with the produced energy, so we did not have to pay the system usage fee for the balanced part. In the non-balancing application of feed-in, a system usage fee had to be paid for the consumption, but not for the amount of energy fed back, i.e. only the electricity fee could be compensated from it.

The system usage fee per kW significantly exceeds the fee for subsidized electricity and is still a very visible item in addition to the increased price of electricity. The design of the island-operated system is about saving this item, we implement the advantages of a quasi-balanced system on our own property.

By using a battery, it is possible to store locally produced solar energy locally and, in case of use, consume it locally. In other words, we don't even touch the electricity supplier's system as long as we have enough produced and stored energy. This is helped by the fact that in most cases, with conscious use, we consume the most when production is also taking place, e.g. the washing machine and dryer should work when the solar panel produces the most. Then it will not even be necessary to store the produced solar energy, but we will consume it immediately, on the spot. At night anyway, the demand for consumption typically drops considerably.

Let's look at a calculation using today's numbers to see how much the power supplier's electricity costs and how long it takes for an average family of 4 to pay for themselves using a well-sized solar panel system.