3 ms·
> Decades old winding drum elevators need DC, so the city maintains a DC grid. Why not turn AC into DC right near such an elevator?
by qwerty456127 6y ago
> Decades old winding drum elevators need DC, so the city maintains a DC grid.
Why not turn AC into DC right near such an elevator?
- leoedin 6y agothis seems obvious, doesn't it? Why would the utility spend all that money maintaining a complex and risky DC grid when they could just mandate AC - DC rectifiers. An elevator might be 25 HP(https://www.ecmweb.com/content/article/20888237/controller-ratings-for-elevator-motors https://www.ecmweb.com/content/article/20888237/controller-r...) - that's ~20kW. A 20kW DC power supply might cost $10k-$20k at most. How many people do the grid have to employ every year to maintain this grid?