myenergi CT Clamp Information

zappi, eddi, and libbi come with one wired CT clamp as standard. The 22 kW 3-phase zappi comes with three CTs as standard. If you would like to see real-time generation from your solar or wind system displayed on your product’s LCD screen, you’ll need an additional CT (available as an optional extra). In some cases, extra CT clamps are required - e.g. for 3-phase installations.

CT Specification

The turns ratio of our CTs is 2500:1, i.e. 100A on the primary will give an output of 40mA on the secondary.

 

General Spec: 16mm Current Transformer
ReferenceCT100-16-05
Window Size16mm
Weight100g
Input Current100A
Output Current40mA
Accuracy+/- 10%
Output Protection10V
Frequency50-60Hz
Temperature Ratings-40˚C to +70˚C
HousingPA66 (UL 94-V0
Output Wire5m UL1015 24 AWG, twisted pair
StandardsANSI C24.13 / IEC 60044-1
  
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Extending CTs

The CT comes with a 5m cable. If there is a need to extend the CT sensor cable, twisted-pair cables like CAT5 or telephone cables must be used (only use one pair).

 

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).
  • An arrow pointing in the direction of import (e.g. towards consumer unit if on Live cable).
  • Must be in the same phase as the Master myenergi device.

All other CTs

  • The 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). This helps avoid phase shifting/phase misalignment.

 CT dos

  • Can be wired to ANY myenergi device in the network.
  • harvi can be used to make ANY CT wireless2.
  • The cable can be extended up to 100m (must use twisted-pair cable e.g. one pair of CAT5).
  • The cable can 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 close to other CTs.
  • Wires can be swapped around 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 (the direction of the arrow or wires must be reversed).
  • Can be set to None if you want to exclude the reading.

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