Zappi V2.1 Multiphase CT & Harvi Requirements

The Zappi V2.1 comes with 3 CT clamps to measure your power usage. For a 7kW single-phase setup, you'll only need 1 clamp for the grid, leaving 2 spare for solar or battery monitoring. For a 22kW three-phase setup, all 3 clamps are needed for the grid. If you want to monitor solar or battery systems with three-phase, you'll need additional CT clamps and a Harvi unit (see the table below for details).