There's also the point that, if we're talking about a European standard, schuko is not one (or rather, is one of many). Perhaps first we need to somehow standardise on one domestic plug and socket design. I'm not expecting that to happen.
There are some connectors that are near universal in 27 of the Eu member states. For values of universal. They are:
- EN 50075 aka C5 aka Europlug. Rated to 2.5A, groundless plug, works in pin ground (it'd. French), edge ground (i.e. German) sockets, as well as Swiss, Italian, etc... it's the closest thing we have to a universal eu plug. Not the most mechanically robust, has a tendency to fall out in some sockets with poor tolerances. But it is universal in the 27.
- EN 60309 16a aka IEC 60309 16a, aka 16a CEE aka "the plug you need on a campsite". Most familiar to people as that plug you need to use a campsite socket. IP44 rated (if installed properly). In high power situations, it is near universal in all 28 member states plus a lot more. It's big, it's bulky, but it can do 16a. Also comes in 32a, 63a, and 125a versions, as well as 3 phase. Whilst all are standard, the 16a is the most deployed.
The standards are there. They are used. Just not always correctly.
Now let's look at charging an e bike with these. Assuming a 440wh battery ( makes the maths easier). To charge that at 2.5a, assuming 80% efficiency, I think comes out at about 1 hour.
With the 16a CEE, assuming the same 80% efficiency, I think comes to about 7 minutes (someone please check my maths).
Interestingly, USB c provides 5A at 20v if you configure it properly. That's 100w. Or about 5.5 hours to recharge this example battery. Is it rated for the duty cycle of an average public charging post? Good question. Given a lot of bike batteries are 48v, charging 48v from a 20v source is not an obvious setup. But it could be there.
In short. There are some options here, but without some sort of guidance from a higher power (aka the eu). Nothings likely to happen. Worst case is we get an xkcd://927 type situation.
The wonderful thing about standards is there are so many to choose fron.
J