Biro (electric moped) repair project

To star off, this is a Biro:

A friend of mine acquired one of these with a broken controller for very cheap. Now the plan is to repair it. It has two engines, in the rear wheels, and a removable 48V battery. Peak power is supposed to be 4000w.

I'm thinking of two Kelly controllers for 48v and lots of amps (200A, should cost about $200*2 fed by one cycle analyst ($140) and a common throttle.
Of course both these controllers will be properly fused, it will get a killswitch, and possibly the brake signal will be fed to the cycle analyst as well to interrupt the throttle.
Thoughts?

Hello stoutejongen1999 (laat Sinterklaas het maar niet horen...),

If you're sure that (only) the controller(s) are broken and can't be repaired, you should also look at the PowerVeloCity controllers offered on this forum. They are constantly updating/grading them and the support and knowledge here seem to be very good. The thread about them can be found here: https://endless-sphere.com/forums/viewtopic.php?f=31&t=75888
"ElectricGod"'s review about them is here: https://endless-sphere.com/forums/viewtopic.php?f=4&t=90536
And PowerVeloCity's website is here: http://powervelocity.com/index.php?id_category=9&controller=category

Good luck and I hope you will document the repair and build in this thread.

SlowCo

P.S. If you can afford it and the batteries can put out more than the 4kW(x2?) I would suggest a bigger 18 or 24 FET controller for increased acceleration

Ah, those look pretty nice! I like that they can be run sensorless as well, my Kelly controller only works sensored and is really finicky about the connections to the hall-sensors so this definitely looks better. I'll try to document something here. First step after we get it working is to replace the lead-acid batteries (yes, really) with some brand new 18650 lithium cells.

It might be interesting to search for Nissan Leaf, Opel Ampera or Chevrolet Volt modules for the battery pack.
Just an example in the Netherlands:
https://endless-sphere.com/forums/viewtopic.php?f=9&t=90395

Cool project. What size were the original batteries? Changing from lead-acid to lithium will make a huge improvement in range. Maybe go to 52v to get a little more top speed.