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Need some help!! I have a 5000w enduro bike - brought from China. I wanted to upgrade my controller and display so took the plunge and got a sabvoton 72200 controller - with CA 3 connector cable built in from factory - and a cycle analyst v3. Great gear but I did not realise just how difficult...

Hope someone can shed some light on a problem my friend is having. He has a 5000w rear hub kit with controller, and tft display - they are all matched leili (chinese brand) components. He has a 72 volt battery as well. The problem we have is that he seems to be destroying the controllers and we...