Quote from: S.Yu on November 16, 2020, 17:43:51Consider BS adaptor can deliver just 55w, this 70w is pretty amazing for me.Quote from: Andreas Stennert on November 16, 2020, 06:57:24If 70% efficiency is true then it's horrible for a charger at this price, but it would explain why the surface is so hot.
So the laptop got 70w maximum measuring at the USB port...
Could you do a measurement at the wall socket to get a reference value for the power draw.
Maybe the brick will draw 100w, but only deliver 70w. Not sure if that is good or bad efficiency, after doing a quick googling it looks like it can swing between 50-90% depending on quality and how close to optimum wattage.
Quote from: Andreas Stennert on November 16, 2020, 06:57:24If 70% efficiency is true then it's horrible for a charger at this price, but it would explain why the surface is so hot.
So the laptop got 70w maximum measuring at the USB port...
Could you do a measurement at the wall socket to get a reference value for the power draw.
Maybe the brick will draw 100w, but only deliver 70w. Not sure if that is good or bad efficiency, after doing a quick googling it looks like it can swing between 50-90% depending on quality and how close to optimum wattage.