3 ms·
Efficiency numbers, please? Is there such a thing as a motor or generator that is more than 65% efficient? 0.65 * 0.65 is 0.42. Then add mechanical losses, and
by dbcurtis 10y ago
Efficiency numbers, please? Is there such a thing as a motor or generator that is more than 65% efficient? 0.65 * 0.65 is 0.42. Then add mechanical losses, and I^2*R losses in the power lines to, from, and along the train lines. Commutation losses for the pantographs (assuming a typical electric loco). Is off peak electricity really 4x cheaper than peak? Otherwise the losses kill the benefits. The article is short on math, which is sad, because the only meaningful question here is one that simple arithmetic answers.
- labawi 10y agoMotors and generators tend to be way more 65% efficient. Random internet search mentions 70-98%. If they were not, pumped hydro would not be useful either. Linked article is short on details, but the link wiredfool gave has more details including a video with numbers (2nd video 02:00). They claim >93% (Combined M&E) one-way efficiency. I don't know what one-way is, but 0.93^2 = 86%, which would make the loss noticeable, but I would still consider it good enough for storing solar/wind.