My advice is if you need to use one, call and ask the property owner VERY NICELY if you could use it. And if they allow you to use it, please buy something from them or otherwise compensate them
I agree 110%. Sadly, not all Tesla owners observe this bit of advice/etiquette. I was visiting
College Station, TX, and arrived to the hotel about 5:00PM. On arrival, I found the only Wall Connector (WC) occupied by a white Model S. I immediately plugged into the adjacent J1772 charger (since I have the adapter - which not all Tesla owners carry), and checked in as a hotel guest.
It was obvious talking to the front desk people that the white Tesla was neither a guest nor had he bothered to ask the front desk for permission. Further, it was apparent that this person was habitually going to the hotel for a charge. Maybe he has some advance agreement with the owner of the hotel to skedaddle when another Tesla appears -- since he did drive off about 10 minutes after we checked in.
Nevertheless, had I not had the J1772 adapter, I would have had to hike to a _public_ WC (which
cranks at 20kW) about 15 miles away to be able to return home (and in the opposite direction of home). Moral of the story, never count on the hotel WC being available immediately on check in, even in the relatively lightly occupied (at least by California standards) destination chargers in Texas and the midwest.
Having said this, I have, on a dozen occasions, asked for, and been granted permission to charge at three hotels local to my house. One of these hotels has the circuit switched off to the WC. So I wouldn't be able to get a charge if I casually did a 'drive by charge', without asking first. Why even get these charges, and try out the 'ask then use' charging routine? So that if my wife or my daughters are sloppy in getting a charge on the home-ward leg, they have a
possible back-up plan, which is entirely permission-based. Importantly, if such a charge were to be needed, the likely replenishment would be no more than 5 miles and take less than 10 minutes (12 minutes if you include asking the hotel front desk).
One more thing. The Tesla DB his highly inaccurate about the kW delivered by the WC. This is evident only if you have a 72A or 80A on-board chargers in your Tesla. The
public charger, delivers 20kW to compatibly equipped Teslas (and not the 'up to 16 kW' from the Tesla DB). However, this is an anomaly among the (soft) errors in the Tesla DB. Some 20-30% that are alleged to be up to 16 kW, are really 'up to 8 kW', or less in some cases.