Hacker News new | past | comments | ask | show | jobs | submit login

Regenerative brakes typically can't handle hard braking braking. In Teslas for example it's paired with regular disc brakes, but those brakes are rated for 100,000 miles because of the reduced wear. I would expect this truck to have regular (loud) air brakes installed, but they might be used less often if the driver brakes early & gently enough for regen to do the whole job.

Regenerative brakes can handle hard braking, but you need some place to dump the energy. Locomotives use big resistive iron grids and fans for this. Those are in the "ears" seen on the sides of modern Diesel-electric locomotives. Electric cars usually don't have that.

A heavy truck, though, probably should. Dynamic braking is great for going down long grades, because the motors and resistors can handle the load continuously without overheating. Some power can go back into the battery, but the battery may not be able to take it all, due to charging rate limitations.

> Regenerative brakes typically can't handle hard braking braking.

Which I very specifically noted…

But if you're driving a 20-ton truck, even routine braking will probably be "hard" braking.

Presumably if the motors are beefy enough to accelerate that 20-ton truck, they're beefy-enough to regeneratively brake it as well, right? I mean, still not as quickly as friction brakes can, but at a comparable level to passenger car regenerative braking.

Guidelines | FAQ | Support | API | Security | Lists | Bookmarklet | Legal | Apply to YC | Contact