Update; It is driving! :) WhatsApp Image 2024-04-01 at 10.37.03.jpeg WhatsApp Image 2024-04-01 at 10.40.28 (2).jpeg WhatsApp Image 2024-04-01 at 10.40.28.jpeg WhatsApp Image 2024-04-01 at 10.40.28 (1).jpeg First Observations: * DCDC is working via CAN control at 220V. I hope it will also work at 200...

Hi, I am using an EVS BMS with VW MEB 12S modules. The BMS is working, but now I want to balance the cells (properly this will take weeks, but anyway). The battery status shows "Balancing Active" and sometimes "Balancing Paused" : BMS State: Ready || Balancing Active Modules: 5 C...

Update: The drive unit is working now at high voltage. So, up to the next problem :) I thought to have 5 stable battery modules (I started with 8 modules). But again, two modules have cells below 3.3V Probably, I bought a batch of bad modules; that's why I am going with 5 modules (4 in front, 1 in b...

Ok, the third Inverter is working at 180V :) I Changed R56 for 56k Ohm, so the 5V bus is at 5,3V (instead of 4,9V), but this was not the issue, I think What I think I did wrong with the previous 2 inverters: In my test setup, I don't have a negative contactor, but I have used the service disconnect ...

Removed the power-stage from the casing (like this https://openinverter.org/forum/viewtopic.php?t=2345 ) You can also remove the power stage without removing the cover. WhatsApp Image 2024-02-09 at 21.47.23 (2).jpeg WhatsApp Image 2024-02-09 at 21.47.23 (1).jpeg WhatsApp Image 2024-02-09 at 21.47.22...

I got another (3th) inverter, this time with drive unit. This one also passed the diode test, and with a bench power supply the udc reading is working. But now I am a little afraid to hook it up to HV. So first, I want to check if the parts I didn't change are OK: OpenInverter Board: I have a V8 boa...

Hi,

I am looking for a working Tesla SDU Inverter to use with Openinverter board.
(shipping to the Netherlands).

If you have one, and willing to sell, let me know.

What I don't understand is that if the inverters were already broken when I got them (so they were broken at high voltage), why did they work at first (when I tested them) at a low voltage? When I applied a high voltage, the inverters stopped working. But after that, the inverters didn't work at low...

jrbe wrote: ↑Thu Jan 18, 2024 11:45 pm Do any of the other analog inputs work? ( Like throttle, temp, etc.)

Yes, the OI board seems to be working fine. All inputs are working, and when applying a voltage on pin 1 of the power-stage connector, I get an udc reading in the web interface.

johu wrote: ↑Mon Jan 15, 2024 7:12 pm Does the udc measurement come back when you drop back to 48V? What is the voltage on pin 1 (UDC_HI) at various bus voltages?

No, It doesn't come back at any voltage.

First inverter: * Test at 48V; everything is working OK; the motor is spinning. * Test at 180V, no udc reading Second inverter: * Bench test of inverter at 30V power supply. UDC measurement is working. * Test at 180V, no udc reading I grounded the drive unit (via the grounding strap) to the car cha...

The inverter arrived, it passed the diode-test. Then I tested it with a bench power supply (max 30V), UDC reading was working. Today I installed it in the drive-unit, applied 180V and the UDC reading is not working any more. (PRECHARGE error) So bad luck again?! Where do I find a working SDU-inverter?

I have ordered another inverter, and I hope this one will work. What I don't understand is why at first the inverter worked (@48V), then I connected 190V, and it stopped working (the UDC-measurement). One thing I did wrong was that I connected the gas pedal potentiometer the wrong way to the OI-boar...

The precharge circuit is providing current, so this is not the issue. With the inverter now removed from the car, I checked: * IGBT (diode test) test results are OK; * A visual inspection of the driver-board seems OK; * HVIL circuit was not working (bad contact in DC- connector), So I disconnected t...

Thanks,
Yes I can charge 1 cell individually, but this will take a few days at 200mA.
What is the minimum cell voltage of the VW-MEB-12S batteries? 2,5V of 3,3V? I assume 3.3V

The EVS-BMS and Tesla Gen2 charger are now wired up. I am waiting on parts for the cooling system. But the BMS cell voltage is low for some cells. A few weeks ago I assembled the battery boxes and the lowest cell voltage was 3.12 volts. Today I read the cell voltages (I assume the voltage drop has t...

Some progress, drive unit still not working, but my priority is to charge the batteries first. The rear battery box is now finished and installed where the old fuel tank was before. High voltage cabling is in underneath the vehicle, charge port installed. Next thing to do is installing/routing the l...

Yes just add some heat to the housing and pull/twist it out.

Thanks for te response. I don't have a 100W lamp, but I will test (this weekend) the prechare system by pulling some current via the dc/dc (Tesla GEN2) converter. I am afried that i have to remove the inverter from the car for futher testing.

Yes only 2 bolts now. For the new bolt I used a rivet nut.

Changing the precharege voltage to 160V didn't make a difference. With the webinterface it is hard to measure udc at precharge. But is think it is reading udc= 1.96V all the time.
At precharge i meassure 1.93V across the resistor.

8+5+8mm is better i think. Looking forward to see your build. My design of 10+5 mm is a little thin.
I am using a 10mm plate where a will tap some threat for nipples to connect the hoses

Hi Peter,
Thanks for your reply. I will try tomorrow.
I am using a 50 ohm resistor

I am using a (front) SDU, I have had the drive unit working with 48V. Now I supplied 186V, the precharge contactor closes (udcsw=175V) but after five seconds it opens again. Error code "PRECHARGE". The inverter isn’t reading any voltage (udc around 2V). I measure 186V on the cables going t...

Hi nubster,
I did it like this: viewtopic.php?p=56088#p56088
Not yet driving so i dont know if it will last.