Sunny Boy User Manual
4 Operation
SMA Solar Technology AG
User Manual SBxx-US-1XP-41-BA-en-11 35
4.8 Secure power supply operation
4.8.1 Enable secure power supply operation
If an outlet and a switch for secure power supply operation are connected to the inverter, you can
supply a load with current from the PV system in case of a grid failure during the day. If you enable
the secure power supply operation, the inverter supplies loads that are connected to the outlet for
secure power supply operation.
In case of overload, underload or insufficient solar irradiation, the voltage supply of the outlet is
briefly interrupted. The inverter automatically attempts to reestablish the voltage supply 20seconds
after the interruption. This can lead to inadvertent starting of the load that is connected to the outlet.
Ensure that the load connected to the outlet does not consume too much power. If necessary,
reduce the power consumption of the load.
In case of a grid failure during the night, secure power supply operation is
not possible.
During the night, secure power supply operation cannot be enabled since the PV system does
not produce power that is required to supply the load.
• In case of a grid failure during the night, do not enable secure power supply operation.
• Continue to operate the inverter on the utility grid and wait for restoration of grid
operation.
• In the event of a persistent grid failure, switch to secure power supply operation after
sunrise.
Do not connect loads that require a stable electricity supply to the outlet for
secure power supply operation.
Secure power supply operation must not be used for loads that require a stable electricity
supply. The power available during secure power supply operation depends on the solar
irradiation on the PV system. Therefore, power output can fluctuate considerably depending
on the weather or may not be available at all.
• Do not connect loads to the outlet for secure power supply operation if they are
dependent on a stable electricity supply for reliable operation.
Procedure:
1. If no load is connected to the outlet, connect a load.
2. Turn the switch of the outlet to secure power supply operation.
3. Wait one minute.
☑ The inverter commences secure power supply operation. As soon as the inverter supplies
the outlet with power, the green LED flashes (1.5s on and 0.5s off) and the message
SPS-mode active is shown in the display along with the amount of power being
supplied from the inverter to the outlet. In addition, the control light of the outlet for secure
power supply operation glows.