The inverter ensures that different voltage and current frequencies between the generator and the power consumer get standardized.
The power storage device offers buffer function. An over / under-coverage is compensated and one can hold power reserves for emergencies.
On the one hand, when during the day strong sunlight generates a lot of energy from the photovoltaic, which can then be used in the evening or at night. On the other hand, to ensure that, if the case arises, power generation fails, it is possible to supply defined critical consumers in the electricity storage facility with defined buffers.
In that way it can be ensured that the alarm system stays constantly supplied with power, even if the generators do not supply any energy for a certain period of time.