CT & Harvi Requirements

Here are the CT & Harvi requirements for Zappi Installation to measure power supply, Solar and Battery.

The new multi-phase Zappi V2.1 comes with 3 x CT clamps inside the box.

If you are wiring this charger as a 7kW single phase unit you will only require 1 x CT clamp for the grid. Therefore, you will have 2 x CT clamps spare that you can use for your solar system or battery if you have either of these (see table below for examples).

If you are wiring this charger as a 22kW three phase unit then you will require all 3 of the CT clamps that come included in the box for the grid. If you also want to see your solar or battery then additional CT clamps and a Harvi unit will be required (see table below for examples).

If you have any questions please contact us.

 Single Phase Power with 7kW Zappi Hardware Guidelines

Solar	Battery	Harvi	Multi-Phase CTs Used
No	No	0	0
Yes	No	0	1
Yes	AC	0	2
Yes	DC	0	1

 

For the above examples you will not require any additional CT clamps or Harvi units as the Multiphase Zappi includes 3 x CT clamps in the box. 

Three Phase Power with 22kW Zappi Hardware Guidelines

Solar	Battery	Harvi	Additional CTs Required
3 Phase	No	1	3
3 Phase	AC	2	4
3 Phase	DC	1	3
1 Phase	No	1	1
1 Phase	AC	1	2
1 Phase	DC	1	1

 

In every example above you will require additional CT clamps and/or a Harvi unit.