One of the most important questions you need to ask before installing a power accumulator is whether the solar battery can be retrofitted or installed as part of a new PV system. This is not only important for the choice of the accumulator system, but also in terms of whether the installation of an accumulator is worthwhile.
If one still receives a high feed-in tariff according to the EEG, then it is too early to purchase a solar accumulator. Depending on when the solar installation is put into operation, the electricity produced autonomously is worth more than the cost of electricity from the grid. Feeding-in is then more profitable than using the electricity yourself, until the compensation expires after 20 years.
However, for several years now, the feed-in tariff per kWh has been significantly lower than the price of electricity purchased from the grid. Self-consumption is therefore worthwhile, but without accumulators, only 30 % of the electricity produced can be consumed directly. With an electricity accumulator, 80 % and more of the household electricity requirements can be covered, and a high degree of autonomy can be attained. For new systems, the integration of a solar accumulator, preferably in the form of an efficient DC accumulator system, is thus always recommended.