The Highcross shopping centre in Leicester has 100+ EV bays, each fitted with a 3 pin socket. They don't attract an additional fee and are not individually monitored (imagine the PITA that would be!). What they do is monitor the usage of the whole lot, and as it goes up feed that into their cost model when they review parking prices. So everyone now pays (for instance) 5p more per hour. As usage increases the parking fee will increase, and the "free" charging becomes more attractive to those who were going to park there anyway.
As for having 22kw in a car park, that is a bit silly. A 3 pin socket is honestly genuinely fine, and each 22kw post has the same power requirement as seven 3 pin sockets (and in reality you'd connect probably 10-12 3 pin sockets from the same supply as they are unlikely to all be connected and drawing max current at the same time)
As for having 22kw in a car park, that is a bit silly. A 3 pin socket is honestly genuinely fine, and each 22kw post has the same power requirement as seven 3 pin sockets (and in reality you'd connect probably 10-12 3 pin sockets from the same supply as they are unlikely to all be connected and drawing max current at the same time)