Charge anytime

I have an Ovo account with the Economy 9 tarriff,which suits our requirements having storage heaters.

I now have a Kia EV2 electric car which I charge with a 3kw Voldt charger on a dedicated feed from an RCBO to a 3 pin EV socket in my garage.

Can I use Charge anytime with this arrangement and if so how does it work ?

Such as how does Ovo know when I use power for the EV only ?

At present my Off Peak is approximately 0.21p

Thanks

Brian