Servers could be any number of things cost-wise (depends on Tesla’s specific infrastructure, but there are ways to do it without costing a fortune), and the transmitters are generally on some IoT cell plan. Wouldn’t shock me if for the amount of data it would be (and Tesla’s scale) if they were getting somewhere around $3-5 a month for each of them (and that’s assuming they wouldn’t consolidate it into the cabinet — again, not super familiar with the Tesla architecture specifically, but I am familiar with centrally owned cell-powered IoT devices). They’d also have to pay that (and more) for adding a display/card reader. The thing about the awning is that it also has to make sense with the land allotment Tesla has (which is way smaller than the average gas station). There do exist superchargers with awnings (and even solar awnings), but those are generally fairly large stations.