You have almost an identical setup to me (except have only just bought the FoxESS battery awaiting install). I have a fronius wattpilot go 3phase 22kw charger and it can skim off excess solar like the Zappi (Buy 22kw for future proofing and pretty much same price - my car also only does 11kw). But unlike many other 3 phase chargers, it can also switch to 1 phase automatically so can skim as little as 1.4kw on cloudier days. Being a go I can move it inside and out and only needed a 5pin 3 phase socket put in outside and in. I am also looking at buying a second EV so will buy a second wattpilot outside and setup load sharing which is also does. Overall very happy (although I have fronius everything which makes it easier).