By now, Doppelmayr has chair lifts with heated seats, which only heat in the stations, as explained here: urlr.me/2pgt3k. But now, they also have lifts with electric lightning and charging (as visible in https://configurator.doppelmayr.com/). Can anyone explain how these work? Becuase after all, you can enable them without the sollar pannel option, so that can't possibly be the only source, right?