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  1. C

    Low temperature solder paste (138c)

    Has anyone use this kind of solder paste for joining 18650 cell? The solder paste melt at 138 degree centigrade, so it’s not as high as normal tin solder. I’m thinking about using this type of solder paste to connect fuse wire to the copper busbar (flattened copper pipe). Any help is...
  2. C

    What wire to use as a fuse wire?

    Has anyone have any information about what wire to use as a fuse wire? I’m building a 20S30P battery pack from old recycled laptop batteries, so I decided to use a tesla style fuse. I can’t find any fuse wire in Indonesia, is there any wire that I can use as an alternative? I’m looking for a...
  3. C

    Low torque with a strange noise on start.

    My setup is hub motor QS 205 2000W 72v, Votol em100 and 20S21P li ion. The bike have a very low torque and strange noise on start. There is a stuttering acceleration if I give throttle from stand still. When the bike is running, everything is smooth. I've tried to ask in votol em100 thread, but...
  4. C

    17 inch motorcycle rim with bicycle hub

    I’m building a reverse trike. I want to lace the 36 hole bicycle hub with a motorcycle rim. The plan is to use bicycle spokes for the rim. I know from searching this forum that i need to have some spacer to get the nipples to seat properly in the motorcycle rim. But I can’t find info on the...
  5. C

    Throttle problem

    My setup is QS205 2000w 72v hub motor with Votol EM100 controller. The problem is when i give it a full throttle, it’s only open the throttle a little bit, or sometimes is start well for a few seconds and then the throttle seem to wind down to a very low speed even when i give it a full...
  6. C

    Help with stray voltage

    My build is 2000w hub motor with 20S12P and 20S9P battery connected in parallel in each cell parallel group. The two battery is connected to one bms that connected to the contactor. I have not connect the controller and the hub motor at all. The problem is I have a voltage reading when I...
  7. C

    Parallel battery charging with different bms

    I’m sorry if this is a newbie question. I have 2 li ion battery, 20S9P and 20S12P. They have a different type of bms. The 20S9P battery have a common - for charging and the 20S12P have a different - for charging. If i parallel the 2 batteries, how do I connect the charger? Because if I...
  8. C

    Cracking noise under hard acceleration

    I’m using qs 205 hub motor 2000w 72v with votol em100 controller. The motor run fine, but on no load when it’s under hard acceleration or deceleration it makes a one cracking noise. I’ve tried to spin to see whether the hub is rubbing, and the hub have nothing rubbing against it. Any idea what...
  9. C

    Daisy chain active balancer

    Have anyone here have an experience with daisy chain multiple active balancer board? I bought this active balancer 1.2A 2s-4S. I’m thinking of using 5 pieces of this balancer in daisy chain for my 20S9P li ion. Will the daisy chain cause all of the active balancer to balance all of the parallel...
  10. C

    Parallel connection Lipo with Lithium Ion

    Have anyone here ever try to combine rc lipo with li ion battery? I have a 20S9P about 20A battery from old recycled laptop battery, it doesn’t have enough current drain I need. I’m thinking about using 5 pcs of 4S rc lipo (4500 mah) connected in series, and connect it in parallel with the...
  11. C

    Charge controller for li ion 20S

    I’m building a charger using 2 pcs of 24v 20A power supply connected in series. The 48v is then stepped up using 1800w boost converter to 82v. To charge my 20S9P li ion battery. My question is; I’m looking for a way to shut off the charging when the voltage reach 82V. I’m thinking about using...
  12. C

    Adding parallel cell group into existing battery pack

    I’m building a 20S9P battery pack from recycled laptop battery. The battery have a cell level fuse. The battery worked fine until there is a short in the votol em100 controller. When the controller shorted out there are 4 cell fuse that is blown, the bms is also blown. The 4 battery have a...
  13. C

    Need help identifying this hub motor

    I bought this hub motor QS motor 72v 2000w But the seller did not know the spec of the motor. I’ve tries to contact QS motor representative, but they can’t give me the spec. Could anyone please help me with the spec of the hub motor? Number of pole pair? Hall angle? Thank u very much...
  14. C

    Need help identifying this QS205 72v 2000w

    I bought this hub motor QS motor 72v 2000w But the seller did not know the spec of the motor. I’ve tries to contact QS motor representative, but they can’t give me the spec. Could anyone please help me with the spec of the hub motor? Number of pole pair? Hall angle? Thank u very much...
  15. C

    Parallel balancing 20S12P battery

    Is it possible to use 5 pcs of 4S balance lead connected in parallel to 20S12P battery to balance charge the battery? The charger is imax B6 charger. I’m thinking if I can parallel the 5pcs 4S balance lead cable through parallel balance charging plate. Is this possible? Thank you for your help
  16. C

    Cell fuse with battery pack fuse

    I’m using 20S9P battery with 45A from recycled laptop 18650 cell. It work well during testing until my controller was dead short. When the controller is dead short, it doesn’t trip the 100A main circuit breaker, but it killed my 45A bms along with burned 3 of the cell fuse. I’m replacing the bms...
  17. C

    Single 20S9P with 12v step down or 20S9P with 4S2P

    I’m building an electric motorcycle with qs 205 hub motor 72V 2000 W, Votol em100, and 20S9P battery. My question is which one is better 20S9P battery with 12v step down, or 20S9P battery with separate 4S2P battery with 72v to 12v step down, charge controller and 16.8 to 12v step down to...
  18. C

    Blown votol em100

    My electric motorcycle is QS205 hub motor 2000w 72v, votol em100 and 20S9P battery. When I’ve tested the motorcycle on a static stand, I’ve put it on full throttle when accidentally activate the cut off switch for the main contactor. The system shutdown immediately. But when i’ve tried to...
  19. C

    Bms over current reset

    I need some help; I recently short my Votol EM100 controller. When the controller shorted, the battery is shut off by the bms (possibly by over current protection). The short cause 3 of my cell fuse in the battery to burned. I’ve check the 3 battery condition and found that it’s normal. I then...
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