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8.4.3
Extending CT Sensor Cable
If there is a need to extend the CT sensor, cable like CAT5 must be used (only use one pair).
8.4.4
Wireless CT Sensor (Optional accessory)
In some cases it can be difficult or impractical to install a wired sensor. For example, it may be the case that
the
eddi
unit needs to be connected to a sub-board, rather than main consumer unit and two consumer units
are in different buildings.
The solution is to install
harvi
– a clever little device that enables the
eddi
products to be installed without
using wired CT sensors for measuring the grid, generation power and/or battery storage system; instead the
CT sensor is connected to
harvi
.
The
harvi
does not need batteries or a power supply – the energy from the sensor is harvested and used to
transmit the measurement signal to the
eddi
. This means batteries or electrical wiring are eliminated!
Up to 3 CT sensors may be used with
harvi
and it also supports 3-phase systems if three sensors are connected.
Refer to the
harvi
installation guide for details on installing and configuring
harvi
for your system.
8.4.5
CT Golden Rules – Grid CT
Only ONE Grid CT per phase (check for only one ~ symbol in Linked Devices Info).
Located to ‘see’ ALL import and ALL export current (i.e. always upstream of any junction box).
Arrow pointing in direction of import (e.g. towards consumer unit if on Live cable).
8.4.6
All other CTs
Arrow should point towards the consumer unit.
8.4.7
3-phase
harvi
CTs
When using
harvi
in 3-phase mode, the CT inputs correspond to the phase number (e.g. CT1 =
Phase 1). This helps to avoid phase shifting/phase misalignment.
IMPORTANT
DO NOT use mains cable, bell wire or
speaker cable. It is important to use
only twisted-pair cable to maintain
signal integrity. The cable can be
extended up to 100m.
NOTE
If a
myenergi
zappi
EV Charger is configured it is not G100 compliant to use a
harvi
to measure grid CT.
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