The load interface transfers current information to the
DLM system by reading a current transformer or an
energy meter, and act as master unit for DLM in the
connection group. In that case, internet connection for
access control is recommended to be done through the
master load interface. The load interface can be
connected to internet via Wi-Fi or ethernet. Refer to
4.13.3 To install the load interface in an electrical
. It can also participate in a Wi-Fi
Mesh network.
The load interface is necessary in most installations and
all settings are done in the GARO Connect app. The
communication platform is in the same network as the
charging station(s).
NOTE
The load interface is available in two versions, GARO
Entity Balance Basic and GARO Entity Balance
Advanced. The difference lies in connectivity. GARO
Entity Balance Basic should fit most installations. If the
Utility meter contains HAN, then this is recommended to
use.
If the group contains local production (like PV/solar
panels) with a net output power that can get close to the
max. current, then a separate energy meter for
bidirectional power is required. Only current
transformers are not capable to detect power direction.
Multi-Level Load Management
The GARO Entity system is prepared to work with the
load interface, to support multi-level load management.
This means that current limitations can be managed on
several (up to 3) levels of the installation.
The fist level could be a fuse, feeding a group of
charging stations. If a connection group contains only
charging stations, then no load interface is required,
total current is calculated by adding the charging
station currents.
The second level could be the fuse feeding the building
where the charging stations are connected.
A third level could be the main fuses to the location.
Up to 4 levels are possible to configure with the app-
based user interface. These settings are made by the
installer.
By using the GARO Connect app, any limitation that
occurs can be analyzed to see what causes the
limitation.
NOTE
A unit (a load interface or charging station) can only
have 1 master role. If a multi-level DLM only consists of
only charging stations (no other loads), a load interface
must be introduced on the second level to manage the
superior group.
DLM Algorithm:
If the total current consumption exceeds the set limit,
then the current consumption is limited to within the
group and all charging station are allowed the same
current. First 3-phase is allowed to all.
If 3-phase power is not available for minimum charging
current of a charging station, but there is still current
capacity on any single phase (1-phase), then charging
can be continued on this/those individual phase(s)
available on some single phase.
Some models of charging stations have a built-in phase
management system, that can select the 1–phase system
fully dynamically to select the correct phase(s).
If all current capacity is used up, and a new EV is trying
to start, then the EV’s will be served in that order they
connected.
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