openinverter forum

What can commands are you after? As I provided an dbc on the previous page for certain parameters.

Right so based on Tom's dbc I have attempted to make a human readable CAN spec which is attached. I think it captures most of the items we would care to have on a display. Powerwatercher should be able to do the maths to get road speed from motor rpm and tyre size. It already has this facility for analog speed input. Let me know if I've missed anything.

Attached amended version following some feedback from Yuriy. He has confirmed vehicle speed from motor rpm will be supported.

Powerwatcher V3 can go up to 600vDC. I have asked him to update his website to reflect this as I could buy a Model 3 if I had a euro for everyone asking this:)

aaannnnd the final version:) Temperature now 1 bit per deg C and signed.

Does the below look correct for translating the .pdf of standards into values that get plugged into the software?


IDC= 309, 0, 16, .1

UDC= 309, 16, 16, .1

UAUX= 309, 32, 8, .1

DIN_OCUR= 309, 40, 1, 1

IAC= 309, 48, 16, .1

OPMODE= 310, 0, 4, 1

DIR= 310, 8, 4, 1

SPEED= 310, 24, 16, 1

TMPHS= 310, 48, 8, 1

TMPM= 310, 56, 8, 1

Have put it in the Wiki.
Would recommend to not shorten any values in the CAN messages, that are coded in the inverter hardware.
Better to shorten in the receiving end.

So, you're saying just leave the gain fields at 1 and just manipulate the data in the receiving code?

That to, but was more referring to the motor and HS temp they are 16bit resolution in code.
I think is good practice to have it same as the programmer intended.....

I don't know the reason for having so high resolution, only the programmer knows.

The point is to have a defined CAN standard, not exactly the way I want it
Good to have some input and suggestions.

Ahhhh got it. I wasn't sure if that was directed at my post or the parameters in general.

Just to update on this I now have the hardware and software for testing this with the Tesla drive unit. Just not had time to do so as yet.

I've got the basic high voltage hardware from PowerWatcher. I'm not far enough with my first build to have it up and running yet but I'm definitely interested in seeing what type of customization will be possible for displays. I'm hoping that I'll be able to pickoff the data being reported and display it within a graphic that I set up. I'm working on converting a 69 VW beetle, and would love to replace the speedo with a digital version that looks like the original with the extra fields on information like WH, consumption and "fuel gauge".

jon volk wrote: ↑Mon Feb 24, 2020 3:56 pm Ahhhh got it. I wasn't sure if that was directed at my post or the parameters in general.

Jon, Did you get your power watcher up and running?

Roadstercycle wrote: ↑Sat Sep 05, 2020 11:32 pm

jon volk wrote: ↑Mon Feb 24, 2020 3:56 pm Ahhhh got it. I wasn't sure if that was directed at my post or the parameters in general.

Jon, Did you get your power watcher up and running?

Never went that route. Working on a web-Bluetooth display instead.

Hopefully a new thread on that sometime. I'm interested and curious.