Rarely is it that a tariff has no charge.
This is a good point I hadn't thought of or factored in to my calculations.
Here virtually everyone that has put on solar in the last few years ( and converted beyond that as I have) heats their hot water with it through the day instead of feeding back to the grid and getting less as a FIT than they would pay for Off peak hot water.
To be able to charge a car at night, You would have to put the off peak back on which depending in the retailer is ballpark $200 and then you have to pay the Offpeak supply charge as well. You would have to pay for a charging point to be installed which would require a special high amp circuit to be run from the meter box. Depending on what you already have hooked up to the home, You would then either have to go to 3 phase which is thousands to have connected as they have to run new wires from the pole OR you would have to have a high amp single phase supply connected and the Meter box and meters ( which the home owner in most cases now pays for ) upgraded as well as the cost of the connection being run to the garage.
Either way you cut it, it's several thousand bux PLUS the charging unit itself. there is also the additional off peak supply charge to be added in.
It IS more exy to run an EV here but all this is even more added expense I hadn't thought of.
Come to think of it, pretty sure offpeak is current limited and the high current supply is different and more exy again. I also have an inkling that there are KWH limitations and as you use more ( in large blocks) the price goes UP rather than down. Might seem odd to some but our water here works the same way.