Sonnen sonnenBatterie ecoLinx 10, Инструкция по установке и эксплуатации, Страница: 19 / 64

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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
Fig. 5 Backup mode
In backup mode, the storage system remains
at a constant state of charge until there is a
utility grid failure. In the event of a grid failure,
the house is powered by the energy stored in the
battery modules and generated by the PV array.
During that time, the power from the PV array
powers the house or charges the battery modules,
depending on production and consumption levels.
The storage system can also turn the PV array off
if the battery modules become fully charged.
In backup mode operation, 10-, 12-, 14-, and
16-kilowatt models of the storage unit will isolate
the microgrid from the utility grid using a 200A
automatic transfer switch. When this occurs, the
storage unit will produce grid-quality voltage and
frequency so that any grid-tied PV inverters in
the microgrid will continue to operate. The PV
array will first power the loads on the AC panel,
with any excess energy charging the batteries
in the storage unit. If there is insufficient PV to
cover the loads, the storage unit will discharge its
batteries to meet demand.
To prevent battery overcharging while in backup
mode, the storage unit will perform a frequency
shift to 60.9 Hz when its state of charge reaches
95 percent. Because the PV inverter is still subject
to UL1741 conditions, it will think that the "grid"
is out of spec for the frequency threshold (59.3 -
60.5 Hz) and will disconnect from the microgrid.
When the storage unit's state of charge drops to
89 percent, it will reduce the frequency to 60
Hz. The PV inverter will see that the frequency
is within the UL1741 range and start its 5-minute
countdown before it attempts to reconnect to the
microgrid and produce power.
If the loads are small and the PV production is
high, then this behavior could occur multiple times
per day.
Attention
Altering a PV inverter's frequency could
damage the PV inverter, the storage system, and
the installation site.
It is the installer's responsibility to ensure
the PV inverter is suitable for use with the
sonnenBatterie storage system.
Generator autostart functionality
The sonnenBatterie ecoLinx can provide a start
signal for a generator to provide power in the
event that the storage system has reached a low
state of charge, the grid is unavailable, and the
PV system is not producing power. When these
criteria are met, the storage system will start the
generator and keep it running until the battery
modules have reached a pre-configured state
of charge, the grid becomes available, or the PV
system begins producing power.