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  1. SpeedEBikes

    Anyone done business with UUMotor?

    I'm interested in some of the BLDC hub motors offered at http://www.uumotor.com/store. Each of their motors is offered in multiple versions listed by increasing voltage and increasing price. I sent them an enquiry asking what was different between two versions of a motor to give them different...
  2. SpeedEBikes

    My mobility scooter

    I'm losing my ability to walk and wanted a scooter I could ride about the house and around town. Here's what I came up with. Going for more welding gas motor, MAC 6T w/ 12 fet Infineon controller bought from cell_man/EM3EV with 16x3" tire battery, Turnigy lipo 16s 30 AH, ~64 volt...
  3. SpeedEBikes

    Troubleshooting a Crystalyte hub motor

    A hall sensor got zapped in a Crystalyte 407/409. Not knowing how to unpot and replace the sensor, and just happening to have a second rotor on hand I swapped the rotor. The motor runs but not smoothly and it's drawing far too much current without a load. I just recently bought an...
  4. SpeedEBikes

    iCharger 208B bug - possible charger FAILURE

    I was charging 3 battery packs with their mains connected in parallel. I was doing a balance charge with the balance plug from a single pack connected to the charger. The pack are 7s and I don't have adapters to parallel connect all the balance plugs together, so I just balance one pack per...
  5. SpeedEBikes

    Controller standby power

    All of the controllers I have used have fairly high standby power requirements, ranging from about 2 to 12 watts depending on the supply voltage. If one forgets to turn off power the standby drain can completely discharge a pack in a day or two, especially if the pack was fairly deeply...
  6. SpeedEBikes

    fast way to unsolder mosfets?

    I was wondering if anybody could offer tips for unsoldering potentially good TO-220 mosfets. I've managed to desolder them using a solder sucker and copper braid to get most of the solder out followed by slowly teasing them out going round and round on the legs with a soldering iron. But it is...
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