From exess-bikes:
The only problem is the controller because Bafang has made several versions which are not compatible. But we are currently developing our own controller which will be much more reliable, more efficient (higher range), better software, better protection. It will be available end of 2018. It fit in the place where the Bafang controller is mounted, so it just replaces the Bafang Controller. It comes with all bikes from January 2019 and it will be available as an aftersales part as well. So the customers having already an EXESS bike can use this controller also.
Will you be able to run more than 30A through the new controller?
yes we will be able to run more than 30A. I don’t know yet how much current we will enable, this needs to be determined.