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Discussion Starter · #1 ·
Hi,
I have a GV200 from a Model S p85. I somehow need to add a 'coil economiser'. Im fitting the battery and motor from P85 using the VCU by Advantics, Elias says i need it so i'll get it.
I've been reading up on this and understand its purpose. I've also read conflicting information about using one diode, two, a mixture of a special diode and regular diode or even a capacitor and a resister. Kilovac seems to come with a small circuit board rather than single component. Im honestly way out of my depth to be able to decipher under what conditions and for what reasons i should use any particular solution and even, what type/size diode/capacitor/whatever.

The best solution i have at this time is buying another contactor with the economiser in it, like the Gigavac GV200-PA EV Contactor from EV west. Hower i think there is a cheaper and faster solution somewhere.

I'd be very grateful if someone could provide a solution or point me in the right direction of some information that may help me devise my own solution?
 

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Discussion Starter · #4 ·
Thanks MattsAwesomeStuff. I'm guessing the controller managing the contactors cant handle the few amps needed to keep them open/shut.
I read that thread 'coil economiser' but got lost in the arguments about the use of a simple resistor across the terminals or resister and capacitor (in my original post). It seems using a zener/mosfet is a better choice than a simple diode, so you dont slow down the separation of the contactor. How that is wired in and sized, i dont know.

Thanks KennyBobby. I read some of the 'contactor control circuit' thread, that was my reference to 'special diodes' aka Zener diodes. Most of it is above my comprehension. While i have a basic understanding of how a diode, resister, MOSFET etc work alone. I'm having difficulty understanding how they function together in the circuit and why one should be used instead of another and how to size them for my purpose. I'm happy with the learning curve but I'm feeling pretty disheartened trying to comprehend it all.

The GV200 i have is single coil. Unfortunately though I dont have a multimetre that can measure inductance :/.
I cant seem to find a way to measure this otherwise, seems i might be resigned to buying some contactors, bummer :(
 

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Discussion Starter · #14 ·
That got feisty. Written communication is great that it lasts forever, but lacks the nuances of tone and expression that may help clear up any miscommunications. I appreciate both ideas and input.

I had seen the idea for a capacitor and resistor wired together.
The maths for how to work out what sizes to use was not clear to me, or if it was explained, i lack the knowledge at this moment to understand it. Looking around on other websites, i did not see the idea widely. My parts bin is also pretty skinny, i bet the bits are only a few dollars and i was pretty keen to try it. However, my goal is for the car to be very highly polished construction, I had made a offroad dirt buggy before this. its was pretty rough but it suited the purpose, although my friends teased me a bit for that. I want this to look almost OEM. I spent $240AUD fixing a mistake of 5mm for my battery box for example, i want this perfect.

The contactors look much more affordable than EV west so i'll probably go with those.

This has been a valuable experience learning about Coil economisers and electronics in general, the entire purpose of my build to learn more about electronics. Thank you!
 
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