Pete1961
10 W
As more amps = more torque & more volts = more speed, I came across an 'open voltage controller' - I thought of this, two nom 36v batts @ 15A max each, to be connected via relays either in series or parallel to give 72v @ 15A for high speed on the flat or 36v @ 30A for serious hill climbs. I can see problems with putting two BMS in series? Only charge each batt individually @ 36v. Idea may be better suited to Ni Cad or Ni Zn (if the latter ever takes off). I am thinking of a direct 'crystalyte' hub motor - above is just an example of the layout - could it be then applied to a light trike 'car' with a single rear driving wheel (a bit like the old Morgan or BSA models of the 1930s). Idea is to have high speed available without extra weight & huge cost of say 72v 30A batt. Also the motor would remain nearer to its natural speed when climbing the hill. Does the open voltage controller need any setting to a voltage range? or can it do what it suggests? I seem to remember that switching between 36 & 48v was once done when SLA was more common on ebikes