One of the most important questions you need to ask before installing a power storage 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 storage system, but also in terms of whether the installation of a storage is worthwhile.
If one still receives a high feed-in tariff according to the EEG, then it is too early to purchase a solar storage. 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 storages, only 30 % of the electricity produced can be consumed directly. With an electricity storage, 80 % and more of the household electricity requirements can be covered, and a high degree of independence can be attained. For new systems, the integration of a solar storage, preferably in the form of an efficient DC storage system, is thus always recommended.