I talked to a very experienced electrician in the company today. I asked him if he had power cables for me because I now only installed 25mm2 and wanted 35ger. He said the following. Through a 16mm2 cable more than 80 amperes can flow through. There was a formula with which one can calculate the ratio from the current to the maximum watt power. Unfortunately I don’t know that anymore. He also said that in the car is GLEIC HANDING. In case of DC voltage it is not important if you have fine copper wires or a copper rod. No different frequencies are sent and therefore the strength of the copper wires is completely unimportant. It is only gladly bought because it looks good and the people do not know the difference. With alternating current many different frequencies are sent and there is fine copper cable required. The resistance of the cable is also not different, even with a coarse copper wire. Now I would like your me Is anyone familiar with this formula and who can prove it to me with the same tension and the fine copper wire?