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Author: BenjaminNelson via YouTube
Go to Source
Working on my 1976 VW campervan, I purchased a Tesla Small Drive Unit (SDU) and installed an Open Inverter board inside it!
00:00 Getting the Tesla SDU
01:18 Draining Transmission Fluid
02:43 Removing the Inverter
05:11 Unboxing OpenInverter Board
06:30 Removing Tesla Logic Board
10:48 Current Sensors
12:41 Installing OpenInverter Board
17:26 Reinstalling Inverter
19:09 Conclusion
The original Tesla inverter logic board uses a proprietary system and isn’t easily controlled outside of a Tesla. Replacing it with the OpenInverter board allows for controlling the inverter just by connecting a battery and throttle.
https://openinverter.org/wiki/Index
I purchased the Open Inverter board as a pre-built/pre-soldered item with a pre-built wire harness from Westside EV.
https://www.westside-ev.com/store/p/build-your-own-tesla-sdu-openinverter-kit
A NOTE ON TORQUE:
A friend pointed out the fact that the torque on the bolts that connect the phase connections from the inverter to the motor are relatively LOW. I noticed that when removing the bolts. On reinstalling the bolts, I tried matching how tight they were. I couldn’t find torque specs specifically for the 2017 Model S Rear Small Drive Unit. However, the 2021+ version AND the 2017-2023 Model 3 service manuals BOTH list torque for those bolts as 11.5 Nm (8.5 lbs-ft)
I bought the Small Drive Unit for only $250, but it was a long drive away from me and the seller said that it "is loud, has a worn differential." We’ll see! If it does make noise, I would think it is more likely a bearing. I also need to buy a High Voltage (HV) Cable to connect the main battery power to the drive unit. They all seemed pretty overpriced on eBay, but I was able to locate one at a California salvage yard which should work, and it’s in the mail to me as I write this.
Immediately after I got the inverter completely reinstalled on the drive unit, I realized that I should have tested the OpenInverter board ON THE BENCH before putting everything back together! I would have just connected 12V power and ground to make sure an LED comes on and that I could connect to the web interface. If it didn’t work, I wouldn’t have to take the inverter back apart to examine or replace it!
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Music by:
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Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/
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