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VESC 75 precharge

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wagner
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VESC Free
Joined: 2020-02-25 23:28
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VESC 75 precharge

Hi,

so I recently started my graduation project which consists of "tuning" an originally 1,9 kW scooter to 20 kW peak power :D
I already got the VESC 75 300 for that project (motor will be qs205 v3 and battery a diy 16S11P 21700 Molicell P42a with 300A peak BMS) and am currently working on the precharge because I want an automatic one (so no XT90S solution).

Is there a build- in way to either precharge the VESC digitally or analog with maybe a contactor?
Iam willing to spend quite some time in researching and developing myself but currently have more practical experience (so pcb design or a custom firmware would be new to me).

Important to note, that I want either a RFID chip to power on my scooter or the original keyless go device.

Thanks and have a great day!

Christian

 

soco frame.jpg

TheFallen
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Joined: 2017-09-11 11:46
Posts: 146

One way would be to put a suitable pre-charge resistor in series with the battery ↔ ESC positive connection, then use a contactor to short out the resistor once the ESC-side voltage reached a set point. As you're not space constrained you can use quite a large contactor/relay.

I'm very interested in this project and wanna see what you do next.

What bike frame is that?

wagner
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Last seen: 2 weeks 1 day ago
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Joined: 2020-02-25 23:28
Posts: 3

Thank you for the ideas! 
I was thinking about something similar, the only problem I see is the fixed precharge time (which would be okay honestly).
The original bike is a Super Soco TC, which is already electric but has just 1,9kW of power. :)