Purpose of an Automatic Backup System

Any time a grid failure happens, a PV system disconnects from the utility grid and the loads connected to the household grid are no longer supplied with energy.

A grid failure lasting for a longer period can have serious consequences for the parties concerned such as:

• Households and companies would have to manage without heat, light, telephone and computer.

• Refrigeration could be interrupted.

• For example, if stable ventilation systems or heat lamps lose power in a farming business.

Possible solutions for bridging this supply gap is to convert existing PV systems into automatic backup systems, or to design new systems as automatic backup systems.

The automatic transfer switching device takes care of the uninterrupted supply of the loads with electricity during a grid failure. The automatic transfer switching device disconnects the household grid with the PV system from the utility grid. The hybrid inverter then creates an automatic backup grid, and the PV system can thus continue to supply power to the loads. When the energy demand of the active loads exceeds the current power of the PV system, the battery will provide the energy shortfall.