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Old 12-11-2021, 03:48 PM   #41
stj
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Default Re: Master power switch for E-bike ideas

just put a fucking 2pole switch on it and stop over-complicating things!
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Old 12-11-2021, 04:27 PM   #42
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Default Re: Master power switch for E-bike ideas

Naah - too basic
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Old 12-11-2021, 06:27 PM   #43
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Default Re: Master power switch for E-bike ideas

I don't think you really can "take off" with the resistor regardless. Worst case it'll run really slowly and the resistor will burn out... Put an appropriately sized 100 ohm resistor there, you can't even get one twentieth of a horsepower out of the motor - that's not going anywhere fast.

Could stick a 120V incandescent bulb there instead of a resistor...still not going anywhere fast, and really cheap.
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Old 12-12-2021, 03:58 AM   #44
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Default Re: Master power switch for E-bike ideas

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Could stick a 120V incandescent bulb there instead of a resistor...still not going anywhere fast, and really cheap.
This is actually a good idea and I thought of it myself a while ago, though the resistance would be all over the place. It's bulkier too, so space is a bit of an issue. Not sure what the "idle" power consumption would be (with the FET off), because the bulb would be in series with the controller box all the time, so long as the battery's connected, but the resistance is probably high enough the power consumption would also be negligible, even with a stone-cold filament.
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Old 12-12-2021, 06:00 AM   #45
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Default Re: Master power switch for E-bike ideas

bulk? use a linear halogen tube - they are like a short pencil.
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Old 12-12-2021, 06:13 AM   #46
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Default Re: Master power switch for E-bike ideas

Yeah but I would use a 250 watt version not the 500 watt version
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Old 12-12-2021, 06:38 AM   #47
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Thumbs up Re: Master power switch for E-bike ideas

Quote:
Originally Posted by stj View Post
bulk? use a linear halogen tube - they are like a short pencil.
Might work. Would still need a holder for it....or I could go ghetto and solder to it directly I already grabbed a 50w resistor from Ali for like 2 bucks which has lugs on the end already. Like I said: no rush, since it's going to be another 4-5 months until I can go for a ride on this thing

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Yeah but I would use a 250 watt version not the 500 watt version
Because 250w = higher resistance ?

Last edited by Dannyx; 12-12-2021 at 06:44 AM..
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Old 12-12-2021, 07:30 AM   #48
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Default Re: Master power switch for E-bike ideas

Yes and less current than 500 watt would be
If you have an old light fixture that uses this type of bulb then you just need to figure out how to use the holders together so it will work maybe make it on a 3 D printer

Last edited by sam_sam_sam; 12-12-2021 at 07:34 AM..
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Old 12-12-2021, 12:10 PM   #49
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Default Re: Master power switch for E-bike ideas

PLA and incandescent bulbs of any type do NOT mix.

And no, don't use those high wattage halogens, you want low wattage bulbs for their resistance, like a 4W night light bulb... or less. Enough to charge the capacitors, not enough to run the bike in any capacity. Unless the intent is to give a thief a false sense of hope?
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