Patent ID: 11967929
Assignee: FRONIUS INTERNATIONAL GMBH
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 1:
2. The photovoltaic system according to claim 1 wherein the different operation modes comprise:
a normal operation mode where the energy supply unit is configured to supply energy to a load network of the photovoltaic system and to receive energy from the photovoltaic generator or from the AC power supply grid to maintain the SoC of the energy supply unit above a predefined first SoC level, L1,
a backup operation mode where the energy supply unit is configured to supply energy to the load network of the photovoltaic system via the inverter until the SoC reaches a predefined second SoC level, L2, when the AC power supply grid is disconnected,
a deadlock prevention mode where the energy supply unit is configured to supply exclusively the inverter of the photovoltaic system with energy when the SoC of the energy supply unit falls below the second SoC level, L2, and no energy from the AC power supply grid is available, and
a standby operation mode where the inverter of the photovoltaic system is no longer supplied with energy from the energy supply unit of the photovoltaic system when the SoC of the energy supply unit falls below a predefined third SoC level, L3, and no energy from the AC power supply grid is available.