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Installation
operation and installation manual
zappi
45
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
zappi
unit needs to be connected to a sub-board, rather than main consumer unit and two consumer units are in
different buildings.
The solution to is to install
harvi
– a clever device that enables the
zappi
and
eddi
products to be installed without using wired CT sensors; instead, the CT sensor is
connected to
harvi
.
Harvi is a patented product and can be viewed
www.patents.google.com/patent/
GB2562550A/en?assignee=myenergi&oq=myenergi
The
harvi
does not need batteries or a power supply – the energy from the sensor is
harvested and used to transmit the measured signal to the
zappi
or
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.
CT Golden Rules
Grid CT
Only
ONE
Grid CT per phase (check for only one ~ symbol in
Linked
Devices
Info
).
Positioned to ‘see’ ALL import and ALL export current (i.e. always upstream of any junction box).
Must be on the same phase as the
master
myenergi
device.
All CTs
Arrow should point towards the consumer unit.
3-Phase
harvi
CTs
When using
harvi
in 3-phase mode, the CT inputs correspond to the phase number (e.g. CT1 = Phase 1).
All
harvi
devices used in a 3-phase property must be set to 3-phase mode
CT can dos
Can be wired to ANY
myenergi
device in the network.
harvi
can be used to make ANY CT wireless
10
.
The CT cable can be extended up to 100m (must use twisted-pair cable e.g. one pair of CAT5). The CT
cable can also be shortened.
Can be clipped around two or more conductors feeding appliances of the same type (e.g. two Live cables
from two inverters that are on the same phase).
Can be in close proximity to other CTs.
Wires can be swapped in the device to reverse the direction of the readings (e.g. change import to export).
Can be grouped with other CTs of the same type so that the power reading is summed (e.g. east and west
solar Generation).
Can be used on the Neutral conductor in a single-phase installation (direction of arrow or wires must be
reversed).
Can be set to none in the
zappi
menu if you want to exclude the reading.
10
Although CT’s connected to a
harvi
cannot be used with Monitor Group option