Hi, I have just had a Zappi 3-phase charger installed and would like to be able to preserve my Powerwall charge as I charge my Model 3 from solar. I think I need an extra CT to monitor the current to/from the battery. Is that correct? I think I read somewhere that you can then set it to either drain or preserve the battery charge but I can’t find anything about that in the manual. Does anyone know how to do that?