Schematic can be found here: https://github.com/jsphuebner/inverter-hardware/blob/master/mainboard-mini.pdf

More info: https://openinverter.org/wiki/Mini_Mainboard

Which current and voltage sensor you are proposing

Depends on the inverter you are using


Specifically how you connect the ...

Also I did read something about the wiring harness that was wired wrong from the factory. Could be the case here?


That is just the twisted pair not being right. Not a big problem.

There is continuity between green and white and yellow and brown

That's good.

20231109_181421.jpg
This is ...

So just to check I'm understanding.

The TX signals from the master look good and get to the first module.

But there is no signal on the RX to the master?

Can you check with a multi meter that there is continuity between:
Green and White
Yellow and Brown

At the connector for the first module ...

On the scope you see mains frequency.

Did you connector the probe tip TXUP an the ground clip to the TXUN. If you measure after the transformers.

If you measure before the transformers you can connect the ground clip to the board GND

cajamatt wrote: ↑Wed Nov 12, 2025 1:37 pm Very cool! I might reach out for some advice on implementing something similar later on since i've only got limited arduino experience

Thank you. Start a topic on your project so more people can play along. Or for specific questions you can send me a DM.

Found the 40pin Part Number : 901303140

Product Description : C-Grid III Header, Dual Row, Right-Angle, Shrouded, Fully Loaded, 40 Circuits, Black

have a look at the wiki, it for Zombie but should apply to this

https://openinverter.org/wiki/ZombieVer ... nd_testing

I think both should go up with throttle.

It's hard to see, but are D1 and D2 the right way round?

the cathode (line side) should be on the side of the transformers.

and if you can scope the pins that connect to the transformers.

On the web interface

Can you include a complete list of your spot values. And please upload the pictures and files to the forum. (see Attachments in the full editor)

With manual start on and fslipspnt and ampnom set. Do you see the angle change in the spot values or in a plot?


There is a PWM signal present on the ...

The MG4 manual has it listed as a 60A fuse.

Think that the heater is a resistive load. Not that this really matters

Screenshot_20251111_091831_Chrome.jpg

The fuse is not for overload protection. But just for short circuit protection.

The most important characteristic of the fuse is HRC (High ...

The Saxo got to a milestone: 100000Km :)

20251104_072010.jpg

Since winter has begun, I wanted a bit more heat in the Saxo.
Until now I had the heater set to 50% via the web interface. And the only control I had was on/off.

20250924_201001.jpg

The Saxo has a slider to adjust the heat in the ...

To use the code with one module you will need to change the number of modules in the code.

The wiring needs to be looped. If my notes are correct.

If you connect the module to the first connector on the chain. Than in the second connector you will need to link. pin 1 and 9 (white and green) and ...

No soldering required the logic and power boards are separate.

Remove the lid unplug the original board, plug in the replacement board and close the lid.

Yes I will.

But I am working on a revision at this time. Going to a 4 layer PCB

In the command line go to the Stm32-sine directory and execute the commands on the guthub.

https://github.com/jsphuebner/stm32-sin ... #compiling

Good luck

Sorry did not see that they are expired. Maybe johu can redo the copile or change the expire settings?

Johu recommends in another thread: “Install the latest version of stm32-sine, which you can find on Git, i.e., compile it yourself. It fixes various CAN issues compared to 5.35.R.” 5.35.R is the latest version I can download as a binary file.


If you want the latest software. You can download it ...

You can modify the code with you favorite text editor.
The files are in the src folder

On windows I use WSL linux command line for windows to compile the firmware. With the Make command.

You need to find this yourself

https://openinverter.org/wiki/Using_FOC_Software

Tuning Process:

Start inverter -> start input or "manualrun" on web interface. Select forward direction.
Observe value "angle" and turn rotor by hand -> you should see angle changes between 0 to 360°. If not, check ...

Did you do a syncofs calibration procedure?


I checked the signal with an oscilloscope.
There was a sine wave on the excitation winding, 4.31 kHz. Vmax- 0.44v

The sin and cos windings have a lower amplitude sine wave, and the amplitude changes smoothly as the motor shaft rotates.
Vmax 0.14v


0 ...

Please read the wiki.

https://openinverter.org/wiki/Using_FOC_Software

https://youtu.be/1SlL6cEoRBgv

Yes. Resolver excitation signal is connected to GND and R1.
S1 and S4 connect to RES_S4S1 pin, the OI board should have 1.5V on this pin

Cool.

So parts needed battery, charger, hv junction box and charge port?

What does the controller do exactly?

Got a MG4 11kW charger to replace the MG ZS charger I have now. 3 phase 16A is more use to me than 1 phase 32A.

20250927_114536.jpg

Found the HVDC an the AC connectors, the LVDC is the same as other MG chargers.

Started to collect info on the wiki : https://openinverter.org/wiki/MG_ZS_Charger ...