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8.5.2
Three-Phase Systems
If the installation supply is three-phase, it is recommend to install a
harvi
device and use three Grid CTs (one
for each phase). This will allow the
eddi
to show the total grid import and export figures rather than just one
of the phases.
If all 3 phases are monitored and the generation is 3-phase, it is also possible to net the export power across
phases. To do this, enable Net Phases in the Supply Grid menu see
Supply Grid – Net Phases
. This allows the
eddi
to use surplus power from any phase and not just the phase which the
eddi
is installed on. However, you
must be sure that the electricity is metered in such a way as to allow this.
3
eddi
units can be installed (1 per phase) provided there are suitable loads.
8.5.3
Battery Storage System
8.5.3.1
AC Coupled
Where there is an AC coupled battery storage system, there can be a conflict as both the storage system and
the
eddi
are effectively competing to consume the surplus energy. Whilst this is not necessarily an issue, the
results can be somewhat unpredictable.
There is the option to allocate a CT sensor to monitor the battery storage; this will give control as to which
device has priority. This CT sensor should be wired to one of the CT terminals of the
eddi
or a
harvi
device if
wireless measurement is required. This CT should be clipped around the live or neutral cable of battery inverter.
During the setup process it will be necessary to change the setting for the appropriate CT to AC Battery; refer
to
CT Config
. Also refer to
Supply Grid – Battery
for information on setting 'priority' of battery systems.
8.5.3.2
DC Coupled / Hybrid
Battery systems that charge directly from the solar array are usually referred to as being DC coupled. This type
of battery system uses the solar PV inverter to provide power from the batteries, thus it is not possible to
differentiate between solar and battery power when using a CT to measure the AC current from the inverter.
Because of this limitation, there are less options for managing the surplus power with this type of battery
system. However, it is usually possible to effectively give priority to the battery by setting an Export Margin in
the
eddi
. A setting of 50W or Third-Party Diverters.
Some properties may have a third-party energy diverter already installed and you may want the
eddi
to take
priority (when consuming surplus power) over the other diverter. This is possible by installing an extra CT to
monitor the diverter.
The CT should be clipped around the Live cable of the supply feeding the diverter. The arrow on the CT should
be pointing away from the diverter. Wire the CT to the nearest
myenergi
device or use a
harvi
unit if wireless
connection is needed. Configure the CT Type as Storage Only. See
CT Config
for details of how to configure
CTs.
8.5.3.3
Voltage Optimisers
If there is a voltage optimiser (VO) installed in the property, the CT sensor and the
eddi
must both be on the
same side of the VO; either the incoming grid supply or the optimised supply.
TIP
It is usually possible to split a 3-phase heating element into 3 individual elements by removing the links.
Summary of Contents for eddi 16A1P01H
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