That’s some system Brydo! What made you go so big? Our average use per day excluding 2×Ev overnight charge is 9kwh. We charge up batteries and cars overnight and then top batteries up or export during the day. We are on Eon Next drive Smart tariff but I haven’t quite worked out how to set cars/batteries to charge smartly through the day (not sure I need to though or if the cars are compatible?). I am interested to see how I could use my system more smartly aswell
You would be better topping up your solar battery and charging the car during off peak hours (6.5p) and selling (or using) duriing the peak hours for circa 15p kW.
Even when charging the cars during off peak hours, your solar battery could just see the car as another load and start to discharge to meet it, rather than using off peak electricity. One way to overcome this is to ensure the car charger is outside the solar battery monitoring zone by making sure the PV/battery CT is downstream of the charger, which it may already be!
There are other ways to do this, as in my previous reply to @Brydo