Page
17
of
51
8.3
CT Sensor Installation
Current Transformers (CTs) are used to measure current at various places of the installation. For example, the
Grid connection point, the solar/wind inverter, or a static battery system.
Installation of a CT to monitor the Grid connection point is required for ECO modes. Other CTs are optional and
can be purchased separately. The number and location of CTs used within an installation will vary according to
the devices installed and the user requirements.
CTs can be wired to any
myenergi
device with CT inputs (e.g.
eddi
,
zappi
or
harvi
). This allows for flexible
installation as a CT can be wired to the nearest device. Ideally the grid CTs should be wired to the
master
device.
NOTICE
The
harvi
device can be used (wirelessly) if it is not practical to connect Generation CT to the
zappi
.
NOTICE
It is not currently G100 compliant to use a
harvi
with
zappi
or
libbi
to measure
Grid CT
, in UK installations.
•
EV chargers and battery storage must have a hardwired Grid CT (in the UK).
SINGLE
PHASE
: A CT clamp must be placed
around the live meter tail as shown above with
the arrow pointing towards the consumer unit.
NOTICE
The clamp can be placed on the neutral tail,
however the direction of the arrow shown above
will need to be in reversed.
3-PHASE:
A CT clamp must be placed around
each phase with the arrow pointing towards the
consumer unit.
NOTICE
A CT cannot be clipped on to the neutral in a 3-
phase system.
Summary of Contents for zappi
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