I’m in Australia and have a 3 phase feed to my house. I have 3 switchboards, a main board where my meter is, and this feed to sub boards, one in my house and one in my shed.
I have solar which is connected on a single phase on the house sub board.
I have plans to replace the existing solar with a much larger 3 phase setup connecting to my shed sub board.
Which leads me to how to monitor it all.
Initially I’m thinking one unit in the main board monitoring the mains, the feed to the shed, and maybe the feed to the house.
A second unit in the house sub board to monitor the solar, and possibly the main feed to the house if not done at the main board plus some circuits going in to the house.
In the future if the new solar gets put in, i will have a 3rd unit in the shed.
The main question, do i need to have 3 VT for each unit, or can one device collect this information for all devices
Also, what are the cable length limits to get from a CT back to the device, eg, can i have the device in the house sub board, and have a CT on the back of a power point on the other end of the house a 40m (130’) cable run away.