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Does anyone know where to buy a 72v or higher battery disconnect switch?

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    Does anyone know where to buy a 72v or higher battery disconnect switch?

    i have been looking everywhere for a 72v battery disconnect switch. All I can find is a 12v-24v switch. I am building a customs ebike and with a max discharge of 100a and I would really like a battery disconnect switch. Could anyone please send me a link to one of you know if one. Thank you in advance I really appreciate it.

    This is the most powerful one I have come across. Although it's only rated at 70V.

    I opted for running a pair of the Luna units in parallel. That seems to work nicely, with no heating up during use.



      Just wondering if you could use a car starter solenoid with a switch?


      • tklop
        tklop commented
        Editing a comment
        I'd not recommend trying that. A starter-solenoid is meant for intermittent operation. I expect its coil would fry if energized for hours on end.

      Don't get stuck thinking "I've got to find an e-bicycle component."

      Consider Marine, Trucking, and Industrial sources. Any application with batteries powering inverters (for example) will utilyze heavy-duty switches whose contacts won't fry due to the high initial inrush of current. Such switches (appropriately rated) would be completely suitable for use.

      Best of luck!



        With the voltages we are talking about here the place where the voltage rating comes in is if it had to disconnect while under load. Higher amps and volts create a larger arc so to effectively disconnect the distance of the open switch has to be greater. This is also where having a DC rating comes in. AC because of the frequency / polarity change the arc tends to quench itself., DC not so much. Dr Frankenstein didn't just use those big knife switches because they looked cooler on camera.

        You can get starter looking solenoids with continuous duty ratings but they are not small, light, or cheap. I think I would be looking around DIY solar sites. Those people are often dealing with higher voltages and lots of amps.


          Look at the ED (emergency disconnect) and SD (Combined Disconnect) at the link below