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  1. fechter

    Ebmx melting throttle button

    A 12v relay will probably be OK at 18v. You could also put a resistor in series with the coil if the coil is getting too hot.
  2. fechter

    Throttle too sensitive after installing new controller

    What kind of controller are you using? Many of them have programmable settings.
  3. fechter

    la Nina rears her ugly head

    I think the rain season is over here. There's a very slight chance for something next week. The grass is starting to turn brown already but it's really tall in a lot of places. Mostly 1-2 feet tall, but over 4 feet in the wetter spots. This is going to be a major fire hazard once it gets...
  4. fechter

    Evt 4000e electric moped -- lithium batteries... would this be a good or bad idea?

    I remember somebody replaced the clock crystal on the board with a faster one to overcome the speed limiter.
  5. fechter

    What is up with(fat tire flats and fat tire challenges?)

    I've been riding my fat tire mountain bike for about 7 years now and have never gotten a flat. (knock on wood). Since you typically run low pressure, a small puncture is going to take a while to go flat. Tires are super easy to change on mine. I can do it with just my fingers. When I first got...
  6. fechter

    Grounded modem and DC-powered server; causing internet connectivity issues

    Right. Like amberwolf says, it has to be a switching mode power supply, not an old school iron transformer and you probably won't get the full rated current out of it before it shuts down, so just use one that's big enough. I wouldn't worry about the loss in the input diodes. They are nice to...
  7. fechter

    Grounded modem and DC-powered server; causing internet connectivity issues

    A coaxial ground loop isolator would break any ground loop involving the coax, but you could possibly have a loop in the ethernet cable as well. It might be worth trying the isolator. Some "wall wart" power bricks can run OK on 48vdc. I've had some that worked on 24v. Just for fun you might...
  8. fechter

    Grounded modem and DC-powered server; causing internet connectivity issues

    I'd guess it's some kind of ground loop problem. You might try looking for an isolated dc-dc converter 48v to 12v.
  9. fechter

    Phase Amps VS battery Amps, mosfet controller

    At 100% PWM, the phase amps will be about equal to the battery amps. At less than 100%, the phase amps will be higher than the battery amps as it's working like a buck converter. Phase amps can be 3x the battery amps or more at low PWM. The controller software typically limits both to keep the...
  10. fechter

    Royally screwed up.

    Nice. It looks like the connector contacts vaporized fast enough that the controller parts were saved.
  11. fechter

    Collapsible Trike

    Nice work. Could you use a ramp to get it into the bay? How much does it weigh? A 100ahr battery is pretty heavy by itself.
  12. fechter

    Royally screwed up.

    You can use a psu with a lower voltage just to see if behaves shorted.
  13. fechter

    Royally screwed up.

    There is 'some' chance it will work OK. When the polarity is reversed, the body diodes in the main FETs conduct, which will limit the reverse voltage to around 2v IF nothing else blows up. It would be good to test the FETs for shorts before attempting to power up again. Unplug motor phase...
  14. fechter

    2008 Polaris outlaw 525s ev build

    I'd avoid placing the motor too close to the axle. It will get beat to death by bumps. Near the swing arm bushing will be much better.
  15. fechter

    la Nina rears her ugly head

    They were predicting less than 0.1" here for the weekend. A rogue cell moved over my location and dumped some very heavy rain for a while yesterday and we got 0.5". The local TV weather guy even pointed out the red spot on the radar that dumped on me. It was only a few miles wide. Anyway, I'm...
  16. fechter

    Hacking a Couple Stromers

    A photo would be good. Normally, you need 5 wires. 3 signal wires and 2 power wires. Halls do not get power from the phase wires.
  17. fechter

    Electric wheelbarrow ecostar lw400 motor hub problem

    What happens when you try to run it now? Anything? Try spinning the wheel both directions by hand. Does it spin freely? Can you measure the battery voltage?
  18. fechter

    There's no way to have a freewheeling hub motor right?

    What size are the tires? I've found most of the smaller size scooter tires have horrible rolling resistance. You should keep them at the maximum pressure (or even a little higher).
  19. fechter

    Controller Wiring Help

    I assume you'd want to keep it connected but not sure. This will change the low voltage cutoff point.
  20. fechter

    There's no way to have a freewheeling hub motor right?

    Most geared hub motors have a freewheel built in, but finding one that would fit might be hard. The drag might be from the brakes or from the controller trying to regenerate. You might try disconnecting the motor from the controller and see if the drag improves.
  21. fechter

    Electric scooter controller replacement

    No, I wouldn't worry about that much increase. Most controllers can take quite a bit over the rated voltage.
  22. fechter

    watersnake slither on 4s li-ion?

    What controller are you using?
  23. fechter

    Circuit breaker blew like a fuse

    Looks like it didn't work. Those contacts look pretty burnt.
  24. fechter

    Chain jumping off main chainwheel

    I've done that before. Took a while to figure it out.
  25. fechter

    60v 1500w Chinese controller problems

    It could be either one. Most controllers will have several fault conditions that will disable the output. These include brake switches, battery voltage too high or too low, throttle signal out of range (most need to be 1-4v), invalid motor hall sensor signals, electronic lock enabled, etc. Some...
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