In an Estrima Biro electric moped from 2014 that I recovered, the original variator, a Kolektor model, Slovenia, no longer works.

So I decided to replace it with a SEVCON GEN4 4827 48V 275A controller.

Updating Estrima Biro electric moped with SEVCON GEN4 controller
Updating Estrima Biro electric moped with SEVCON GEN4 controller

Le variateur SEVCON GEN 4827 36V-48V 275A taille 2
Le variateur SEVCON GEN 4827 36V-48V 275A taille 2

See also : Essai Estrima Birò : que vaut la concurrente du Renault Twizy ?.