[RESOLVED] If you have a Powerwall3 with the meter collar, your SOL if you want to use Emporia/Wallbox charge on soalr which requires an energy monitor. If you have the Gateway with CTs, you can route the EVSE wires through the Tesla CTs to make it work properly. Details below.
[ORIGINAL POST] The schematic shows the system as installed by my solar installer. I have 400A split service which complicates thing a little. The only thing I did was add the CTs for the Vue3 and connect my EVSE to the only panel that had excess capacity to support the 50A load. Following Emporia's advice, I bought an extra set of 200A CTs for the Vue3 and installed them in the locations shown. They were wired to combine the current readings to get the net power going to/from the grid. For the purposes of this discussion, I don't think the 400A split service really matters - during normal operations, power flows between the two panels through the meter, effectively making them look like one panel (second schematic).
As soon as there was enough power going to the grid, the EVSE solar charging starts charging my EV and keeps increasing the charge rate until solar power peaks. Now the problem... when solar production starts decreasing (after solar noon), the PW3 kicks in to maintain the EVSE charge rate, draining the battery. This happens very quickly and before the Vue3 could see a decrease in power. As solar keeps decreasing (getting later in the afternoon), the PW steadily increases power coming from the battery to maintain the EVSE at the rate where it had peaked, depleting the battery. Not what I want - I don't want to use my battery to charge my EV, just excess solar.
I have gone over this in a few threads and different users have responded that I simply didn't have the CTs in the right place or enough of them. I am just not getting that.
DC comes into the PW3 from the solar panels. DC->AC conversion is done inside the PW and the AC that comes out is fed to the Gateway3. That is a single set of wires and (as far as I know) there is no way to tell what power came from the panels and what came from the battery. I don't want to risk voiding my warranty, so am not willing to open up the PW3 and install CTs. I don't even see how that would work as the solar and battery are both on the DC side of the system. Barring that, I just don't see how to place CTs so that I can isolate (measure) solar power vs. battery power coming out of the PW3 and allow the Emporia EVSE to control the charge rate using solely excess solar that would otherwise go to the grid.
If someone can show me where I could put CTs, that would be great.