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The harvi device allows you to connect additional CTs easily. The CTs wire to the harvi, and the harvi connects wirelessly to the hub (if your Zappi has been installed with the OLEZ grant you will already have a hub).

The harvi gets its power from the CTs so is easy to install.

As above it is not needed, but is a nice to have if you want to see where your electricity is going.
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