[hoggy]

Don't have either but given the choice I'd take the Zappi over the Hypervolt (keep hearing they struggle a bit with Wifi (presumably because it ultimately runs off a Raspberry Pi.) Generally the Myenergi/Zappi ecosystem just seems more polished to me)
As an aside I have the Indra Smart Pro which does solar matching absolutely fine. I Think EO do one as well with Solar capability. Givenergy also have one coming if you happen to have their inverters which will play nice with solar.

 

[hoggy]

Givenergy have an EV charger due out end of June which deals with solar I am waiting to see how that compares.

On another thread I have listed all the chargers that can be set to 6amps which is ineffect how you can use excess solar.

If it helps you can also set the Ohme up in a bit of a fudge to output various amps by selecting different vehicles as your car.
i.e MG ZS Trickle Charge - 6A
Nissan Leaf 3.3kW - 13A
and so on.