Referrals requested for adding regen braking to ebike kit

[ebike Richard]

I have a 48-volt rear-hub non-geared motored ebike assembled from a kit with 5-level PAS and a throttle.
I'd like to add a regenerative braking system (ideally a 4-level system) to my ebike.
I want a regen braking system so I won't have to ride my brakes so much while going down steep hills.
I realize I likely will have to replace my controller, but that's fine.
I'd appreciate any information / suggestions / referrals which would help me achieve this goal.
So far I've heard of a one-speed regen system controller made by EM3EV
https://em3ev.com/shop/12-fet-irfb4110-infineon-sensorless-controller/
and was wondering if there are others, particularly one which offers several levels of regen.
I live in the San Francisco bay area.
Thanks!

 

[Ann M.]

Richard, you could also use a programmable controller made by Golden Motor. Their external controllers are designed for one level of regen; however, you can program it to how much regen it can safely do.