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  1. fechter

    Spot welding brass?

    How thick are your brass sheets?
  2. fechter

    Solid State Relay for lighting system

    Those should work, but if the dc-dc is off, what are you going to drive the relay with? Those are rated for 3-32v input, so you could find 5v somewhere coming from the controller to drive it.
  3. fechter

    Solid State Relay for lighting system

    Are you wanting to use the relay between the battery and a dc-dc step down converter?
  4. fechter

    using a bms with less cells than it it's made for

    Glad it worked out.
  5. fechter

    Converting a 24v lawnmower to 36v?

    Seems like running the batteries in parallel would be low risk so you could try that and see if it’s fast enough. Lead acid batteries sag a lot under load so it might be pretty close to stock.
  6. fechter

    using a bms with less cells than it it's made for

    Correct. I learned the hard way you can't just leave the wires floating. By tying it to the cell above, that channel is effectively turned off and won't trip the BMS. But there are many different BMS designs, so some may not work like that.
  7. fechter

    using a bms with less cells than it it's made for

    If two BMSs "share" a cell, something bad might happen if one of them trips. I've used several BMSs with fewer cells by having the unused tap wire at the positive end of the string and tie the unused tap wire to the positive. This might not work with the fancier Bluetooth units.
  8. fechter

    Tony Shifter Kart with SIA 155-64 Hairpin Motor

    Nice! Have you driven it yet? They might make smaller throttle pot boxes. Or you could mount it more in the center and extend the shaft somehow.
  9. fechter

    Soft start for a 2 phase inductive load/Transformer

    With the transformer issue I was referring to before, it was the transformer itself and not really the load that was causing breaker trips. They make solid state relays that only switch during the zero crossing. If you could turn on the transformer with a zero crossing relay instead of a...
  10. fechter

    Soft start for a 2 phase inductive load/Transformer

    I'm not sure how long they take to cool off. It might be more than 10 seconds. If the power is cycled too quickly, the breaker might trip. When the motor starts, it's going to have a pretty big current inrush until it spins up. They make time delay circuit breakers designed to handle motor...
  11. fechter

    Soft start for a 2 phase inductive load/Transformer

    I've seen some equipment that just used a big NTC thermistor in series with the AC line. Without it, the breaker would trip sometimes. With it, the breaker never tripped. The trick is to choose the right size for the application...
  12. fechter

    la Nina rears her ugly head

    That lightning has a way of starting fires. I'm getting smoke from the fires in Canada. Otherwise sunny and windy.
  13. fechter

    ATV Battery Build

    That place has some nice (and cheap) batteries.
  14. fechter

    TRS300 HELLO. Harley Conversion. ME1616

    Is that a water cooled motor? Any idea what batteries you're going to use? A Harley is pretty heavy to start with.
  15. fechter

    Using rooftop grid-tie solar during a power outage.

    I have the smallest Enphase backup battery system (3kwh). If the power goes out during the day, I can get the full power from all my panels in addition to what the little inverter on the battery makes. I also have their transfer switch which automatically takes selected house circuits and puts...
  16. fechter

    [SELL] 100 18650 Molicel p28a Li-ion Batteries $1.75/cell In US (Texas) New Old Stock No Tariffs 10% off with code

    Do you know the manufacture date?
  17. fechter

    BBSHD binding

    Possibly the bolts are a little too long and hitting something. Washers might help.
  18. fechter

    Identifying hall sensor

    The picture is terribly out of focus. Try again.
  19. fechter

    Ebmx melting throttle button

    OK, I stand corrected. The SS41s can take more. So you'd need a 5v supply to use a throttle, which would be more complicated. My old Zappy scooter used a trigger switch to activate the relay. Those are probably available somewhere.
  20. fechter

    EDIT: Solved. - Anyone know what's causing this grinding / halting at high RPM?

    It shouldn’t be loose like that. Either the bearing is bad or something isn’t machined properly for it to be tight. Sometimes you can fix excessive clearance with metal shims or loctite.
  21. fechter

    Ebmx melting throttle button

    If you use a solid state relay you might be able to drive it with a Hall effect throttle. Most linear hall sensors can take 18 volts.
  22. fechter

    Bafang BBS01 CAN throttle not working

    The throttle is analog, so should work. Check the program settings.
  23. fechter

    Gears not meshing BMC 48v 1000w hub

    Maybe the motor is running backwards or possibly the clutch is installed backwards. With the power off, try spinning the wheel by hand in both directions. The freewheel clutch should engage when turning backwards.
  24. fechter

    la Nina rears her ugly head

    It actually rained a tiny bit here last night. The ground is wet, but that's about it. I don't think the grass is going to turn green again.
  25. fechter

    Analog electronic soft start E-bike throttle solution.

    The extra magnet just makes the throttle less sensitive at the low end.
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