I have solar collectors on the roof. I would like the car to charge when there is sunshine. That way the power is free. I think some of them allow you to set a time period of two days for your car to be full. The device then ensures that the car is charged when there is "free" electricity.
I have the MyEnergi Zappi.
I don't have solar myself, but one of the benefits is that you can fit multiple remote energy monitors so it understands energy usage from the grid, and production from solar and can then tune charging appropriately.
I can see in the app my draw from my only source (grid), and this has been done over wireless rather than a wired clamp (as my charger is a long way away from my meter and otherwise would have required running new cables)
If you are in the south-east UK, I was very impressed with my installer...