Moin together, I have a question that my workshop has dismissed as impossible… We have an empty suitcase trailer, for this we bought a 680 liter tank, which is needed for my work. In the tank is a diaphragm pump installed, in addition a 100 Ah battery, which should supply the diaphragm pump with electricity. Tank, pump and battery are in a trailer, which does not hang continuously on the towing vehicle. Now – if possible – the battery i m Trailers are connected to the power lines in the trailer so that the battery in the trailer is charged during the journey over the towing vehicle and the 13-pole connection, however, there should not be a continuous current flowing through, so that the towing vehicle is not unloaded overnight, for example. I hope I have put it reasonably intelligible and here is someone who can tell me whether this works – and if so – how this can work. I thank you