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your appliances will be powered by the batteries
of the storage system conditioned upon installer
connection of back up function.
Backup mode
The sonnenEvo storage system automatically
switches from grid to backup operation and vice
versa. In the event of a grid failure, the storage
system automatically detects the grid outage and
will disconnect itself from the public electrical
and will create a microgrid using the power from
the batteries. Appliances connected to essential
loads circuit in the house will be supplied with
electrical power. Appliances connected to normal
loads circuit in the house will not be supplied with
electrical power.
During the backup operation, the micro-grid
produces grid-quality voltage and frequency so
that any grid-connected PV inverter in the micro-
grid will continue to operate. Therefore, during
backup operation, the essential loads circuit will
be powered by the energy stored in the battery
modules and the PV energy generated from the
PV array. The generated PV power will also charge
the battery modules, depending on generation and
consumption levels.
The PV array will first power the loads on the
essential load circuit, with any excess energy
charging the batteries in the storage system. If
there is insufficient PV to cover the loads, the
storage system will discharge its batteries to meet
the demand. The storage system can also turn the
PV inverter off if the battery modules become
fully charged.
To prevent battery overcharging while in backup
mode, the storage system will perform a frequency
shift by raising the frequency to a value outside
the PV inverter's operating range. This shift in
frequency will disconnect the PV inverter from the
micro-grid while the storage system will maintain
the power supply to the loads. The storage system
will reduce the frequency to 60 Hz once the
state of charge falls below a certain threshold to
allow for a charge event. The PV inverter will then
automatically detect the frequency adjustment and
re-connect to the microgrid.
Emergency mode will set the backup buffer to
100%. The settings can be changed in the app.
Microgrid Re-Enabling
If the battery SOC drops to a minimum
threshold during backup operation:
▶ The microgrid will be deactivated, and the
system will go to 'standby mode'. The essential
loads and the external PV inverter on the
microgrid will disconnect consequently.
▶ The system will remain in 'standby mode' until
the system time reaches the "Re-enabling time
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