In this video, Elon Musk waxes philosophical about why hydrogen fuel cell technology is "dumb":
He doesn't give any actual numbers though...but I guess that's to be expected. He says that the efficiency of electrolytic hydrogen extraction from water is poor, but some of the papers I've read say that the conversion efficiency of current industrial electrolyzers can push
70%, which actually sounds pretty great to me.Does anyone have ballpark figures on what the roundtrip efficiency of say, 120V house current electricity -> hydrogen electrolysis -> hydrogen storage -> fuel cell -> inverter -> 120V house current would be, using current or near future technology?