c/micromobility · by FARTYSHARTBLAST@sh.itjust.works · 2y

Yadea unveils 99 MPH electric motorcycle that charges in 10 minutes

https://electrek.co/2023/11/11/yadea-unveils-99-mph-electric-motorcycle-that-charges-in-10-minutes/

33 points · 11 comments · view on lemmy.world

11 Comments

litchralee@sh.itjust.works · 13 pts · 2y (2 replies)

I wouldn't be shocked (pun intended) by an electric motorbike that can do 160 kph, but the 10 minute charge rate would be ambitious. From their figures, that's for an 80% charge for a 6.4 kWh battery pack, or 5.12 kWh delivered. Assuming perfect charge efficiency, that's a power rate of 30.7 kW. The C-rate of this battery pack would have to be 30.7/5.12 = 6C.

For comparison, a Hyundai Ioniq 5 automobile has a 58 kWh battery pack and (apparently briefly) supports 350 kW DCFC. The best such battery pack would have a C-rate of 6.03C, but most likely is lower because this rate would imply a charge time of 10 minutes, not the 18 minutes advertised by Hyundai.

So if a major automaker's new(est?) EV is only marginally able to achieve the charge rate of 6C, it doesn't seem likely that a motorbike manufacturer will be able to beat this, let alone have a comparable average charge rate. The same analysis for some of the other electric motorbikes linked from the article have lower peak or average C-rates, and those motorbikes already exist.

TL;DR: charging is hard. Apply heavy skepticism.

jws_shadotak@sh.itjust.works · 2 pts · 2y (1 reply)

You made your point about C-rates, but what about D-rates?

nilloc@discuss.tchncs.de · 6 pts · 2y

Quiet motorcycles = big D energy.

Everyone knows that.

IamRoot@sh.itjust.works · 4 pts · 2y (4 replies)

Sure it does.

Neither of those things.

CharlesMangione@lemmy.world · 4 pts · 2y (1 reply)

Kinda seems like one of them-there advertisements.

IamRoot@sh.itjust.works · 2 pts · 2y