Sonnen sonnenBatterie eco Gen 2, User Manual, Page: 18 / 30

10
The DC power that is generated by the PV array
( A ) is converted to AC power by means of an
inverter ( B ). The meters ( C ) and ( D ) measure the
current electrical power in watts. The production
meter ( C ) measures the power production, the
consumption meter ( D ) measures the power
consumption in the house. If the production is
higher than the consumption, the surplus will be
stored in the battery modules ( E ). The storage
system’s inverter ( F ) converts the AC power
to DC power while the battery modules ( E ) are
charging. When the production is lower than the
consumption, electric power will be released
from the battery modules to power the loads. The
storage system’s inverter ( F ) converts the DC
power of the battery modules ( E ) to AC power.
The utility’s power meter ( G ), measures the power
supply and the power fed back to the grid ( H ) by
the PV array (if applicable). The storage system
will not discharge its batteries to the grid in
normal operation.
Backup mode
In backup mode, the storage system provides
grid-quality power to keep the PV array working
when the grid goes down. During the day, the
PV array initially powers the household loads
fed by the backup sub-panel and uses any excess
power to charge the battery modules, depending
on production and consumption levels. The
house can then be powered at night by the solar
energy stored in the battery modules. If there is
insufficient PV during the day to cover the loads,
the storage unit will discharge its batteries to
meet household demand.
In backup mode, the 10-, 12-, 14-, and
16-kilowatt models of the sonnenBatterie eco
storage system will automatically isolate the house
from the utility grid using a 200A automatic
transfer switch. Once the grid comes back online,
the storage system will automatically reconnect to
the utility grid.
In the event of grid failure, the smart storage
system can also turn the PV array off if there
are no household loads to be fed and the battery
modules become fully charged. If the loads are
small and the PV production is high, then this
could happen multiple times per day.
P P
E
F
B
A
D
G
H
C
P P