I had a Tesla Powerwall 2 installed yesterday, to complement my solar PV panels & EV car - all rather exciting. The Powerwall can store ~13.5kWh usable, with a max charge rate & max discharge rate of ~5.5kW. Unlike the solar panels I’m not sure it will ever be financially worthwhile, but it’ll be both interesting and fun to experiment.
I would like to be able to measure the amount of power that goes in to the battery separately from the amount that comes out - not just a net figure. Is this possible with a single CT sensor and if so what feed processes should I use?
If it is not possible, perhaps I could put one CT on the L wire and only allow it to measure flow in one direction, and another CT on the N wire & only allow it to measure flow in the other direction. But again, what would be the best processes to use?
Using 2 CTs would be second best as it would require a new emonTx, c/w ESP8266 etc etc.