DCFC of a 72V ebike?

[silverramp]

I was wondering if some of you knowledgeable folks could share your initial opinion of a project I'm dreaming about: Specifically, could I use NACS to DCFC a 72V ebike/emoto?

I thinking about building a battery that would be 1S4P @ 72v when riding, but switch to 4s1p @ 288v when using DCFC. Something similar to dewalt's 20v/60v battery packs. I suppose another option is a DC-DC converter, but I get the impression that could perhaps be bulky/expensive at ~5-15kw.

Do you all think this would be very difficult/do you think it would work at many stations in the USA (I wouldn't have a VIN)? To be totally transparent I'm an ebike enthusiast and not an engineer, so my skills would be lacking to pull off doing something like designing a bespoke BMS or other electronics.

I know I can access lvl2 AC charging with 72v off the shelf chargers. DCFC would be a nifty additional charging option, especially for longer trips. The small NACS form factor would be nice on the bike.

Thanks in advance for entertaining my post.

[tom91]

Do you all think this would be very difficult/

Yes

And useless really as you would be pulling almost the same amount of power as charging off AC

[silverramp]

Thanks for your thoughts!

The utility argument would be the greater ubiquity of DCFC vs lvl2 sites. And maybe I could charge at a higher rate, say 2C. But yea, the utility probably wouldn't be enough to warrant the effort!