Where are you based in Germany? If berlin, I might be able to help with contacts if needed.
Leipzig! But an electrical engineering friend of mind has cracked it, probably. Just trying to decide if it's probably enough to give it a go.
Germany is 240v so the original calculation needs to be adjusted. If you have 3 phase then connecting across the phases gives you 415v roughly :-
4700w / 415v = 11.3 (12amp)
If your cable is useable up to 16amp and the fuse in the consumer unit is 16amp you should be golden.
@Tijmen started
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Where are you based in Germany? If berlin, I might be able to help with contacts if needed.