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CT3
CT3 Input (V3.XXX firmware only)
CT Type
Function Description
None
No CT connected.
Grid
Grid CT monitors the import and export power of the property. This is the CT used to determine
if surplus power is available.
There must only be one Grid CT set for each phase
Generation
Only
Monitors Solar PV or Wind generation
Storage Only
Monitors a device that can 'store' energy (e.g. a third-party energy diverter) and enables the
to take priority over it. The power used by the third-party device is considered as surplus
power unless the device is intentionally using grid power (i.e. it is boosting).
The CT should be installed on the “live supply cable feeding the diverter, with the arrow pointing
away from it (i.e. towards the consumer unit / fuse board)
Gen &
Battery
Monitors Solar PV or Wind generation that is combined with a DC-coupled battery
Monitor
Monitors any load, for example a washing machine or a lighting circuit. This setting can also be
used to limit current drawn by devices on a particular circuit which includes other
loads.
See Load Balancing / Current Limiting (page 40) for more details.
AC Battery
Used to monitor an AC-coupled battery.
With this setting it is possible to manage the distribution of surplus energy between the battery
and the (and other devices).
The Battery setting in the Supply Grid menu is used to configure how the will operate
alongside the battery system. See
Battery Storage Systems (page 41) for more information. The CT should be installed on the “live
supply cable of the battery inverter/charger, with the arrow pointing away from it (i.e. towards
the consumer unit / fuse board).
When using a wired CT for the Grid current reading, can also monitor the CT to make sure that it is still
connected. This is important when using the Grid Limit (or “Load Curtailment”) function in the zappi and is a required
by some distribution companies.
“G100” is a UK requirement which describes the technical requirements for export limiting schemes
2
. It does not
apply directly to “import limitationor “load curtailment” schemes but the general requirements are referred to by
UK Distribution Network Operators in this context.
Normally the G100 setting should be turned ON for wired Grid CTs
2
https://www.energynetworks.org/assets/images/Resource%20library/ENA_EREC_G100_Issue_1_Amendment_2_(2018).pdf
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