Thanks to share vidéo. Nice to see this going foward.
The problem is that they use 48V or 72V motors. This voltage is too low to build a power-efficient system. This is why Tesla now moved to 800V DC.
No.
A 48V motor can be 96% efficient and a 800V motor can be 96% efficient.
The difference is the first one will give few kW and the second one will give around hundred kW.
If you plan to play with Tesla motor, the permanent magnet one on the rear of model 3 and Y is quite popular, efficient and powerful.
Ingenext sell all the modules to hack Tesla motors or batteries.
Still, if you plan to go relatively low voltage at 90V (what I consider a good idea), there is many other efficient motors working at that voltage.
But they will require a gear ratio as most run at 4000-7000 rpm.
I have an eye on the Montenergy ME1507 motor for a futur sailboat build. It's efficient, compact, powerful and come in air cooled or water cooled version.
You can also look at crash Zero motorcycles on auction to reused motor/controller from them as they work at ''low voltage'' of 102V.