Audi-ence

It's an interesting comment. I have just bought the hybrid A3 4.0 and have started charging it with the granny charger. I have not stuck a current monitor on the output while charging, but I believe the maximum charge rate is about 10A from what it states on the charger itself. This is below what house wiring is rated to (13A) but then you have to bear in mind that house wiring comes in all sorts of states, from modern solid core on sockets that have hardly been used, to stuff that is 50 years old and has somewhat (very) worn plug hardware/contacts and maybe questionably rated cable. Believe you me I have seen some horror stories in my time. I think this is why the warnings on charging are given, because manufacturers know that home electric distribution systems are far from standardised, and often far from being maintained in good condition. When you get a hybrid, if you decide to use the granny charger you are going to be running that 10A draw a lot. Some people for many hours per day. My guess is that most people in their houses will have nothing that is not fixed wiring (eg cookers) that will draw that amount of current for that long a time. You also need to consider that you may be running other devices off that same ring/circuit that you are running the granny charger off, which may lead to additional heating/stresses on the wiring. I have checked my electrical charging infrastructure with a thermal imager (sorry geek mode) to check the temperatures in the plug sockets when charging and although I would say they are within reasonable limits it is clear there is a very definite rise in the temperature of both the wiring and the sockets, both of which I consider to be in a good state. You'd expect this of course. My advice would be if in any doubt to get your electrical infrastructure that you intend to use for charging checked out by a qualified electrician to make sure it is ok - hopefully lump it in with a few other jobs you need doing at the same time. I am not necessarily going to get a wall charger, but at some point I will probably get a dedicated spur on its own fuse in the consumer unit for charging purposes.

I don't think that is a micro USB plug, or at least it isn't in my A3. It's a USB type C.