https://www.google.com/search?client=safari&rls=en&q=voldt+charging+cable&ie=UTF-8&oe=UTF-8
Have a look at this Dutch site they list a 32a Commando socket and 7.4kWh granny charger £219.00 Kezo can advise as regards the electric side.
Unfortunately I have suffered a brain injury and occasionally I get confused and often say the wrong thing.