Explanation of Used Terms

Self-consumption

Generated PV power is consumed at the site where it is generated. Self-consumption is made up of direct consumption and battery charging.

Intermediate storage

Battery charging and discharging as a measure of energy management

The intermediate storage enables the consumption of PV energy independent of the time of generation, e.g. in the evening or during bad weather. This means that time-controlled electrical appliances can also be operated with PV energy.

Battery-backup grid

Part of a household grid which is supplied by the battery-backup system in the event of grid failure.

Battery-backup system

In the event of grid failure, a battery-backup system supplies loads with energy and a PV system disconnected from the utility grid with voltage.

Parallel grid operation

The parallel grid operation is one of several operating modes in a PV system. In parallel grid operation the PV system feeds the generated PV energy into the utility grid. In parallel grid operation, the battery inverter is responsible for the optimization of self-consumption or internal power supply.

PV system

System in which PV modules convert part of the solar radiation into electrical energy. The PV system consists of the PV modules and at least one PV inverter.

Bridging time

Time from the grid failure until restoration of the utility grid which is bridged by the battery-backup system.

Automatic transfer switch with battery-backup function

disconnects the battery-backup grid from the utility grid in the event of grid failure.

Switching time

Time needed by the battery-backup system to restore the supply of the loads in case of grid failure.

Cycle stability

Characteristic for the service life of a battery

The cycle stability indicates how many times a battery can be discharged and charged before the available battery capacity falls below a specific value (see the battery manufacturer's specifications).