Tesla Charger Support thread gen2/gen3

[janosch]

Hello,

the last one got closed because it went out of hand, so here is a new one.

Helpful resources for both:
Wiki Gen2
Wiki Gen3

Tesla Charger Firmware thread
previous: Tesla Charger Support Thread (started in 2019)

There has been ongoing development for a long time, so consider the information in above resources and:
Cross reference it with the date of it being published.

Also, Gen3 and Gen2 operate very similarly on a firmware level:
Even if you are using Gen3, the documentation to Gen2 might help you resolve your problem and vice versa.

Any other questions can be posted below, I am available for paid calls of course, but a lot of questions can be answered when reading above material, or posted here for free and me and others can chip in

[PetersonOctavius]

Hi there,
as im waiting for my OI replacement board for the gen2 i was wondering if its possible to leave the battery pack permanently connected to the charger ( via a fuse) and the gen2 DCDC (via a fuse ).

thanks in advance

[arber333]

Hi, i am installing Tesla Gen2 charger to my Mazda and i need to setup a disable circuit for VCU so that someone cant just drive off with charge cable connected .
I am looking at schematic for both connectors and i notice there are two additional pins which are ready as input and output but dont seem to be used.
Those pins are OUT4 and IN2. Out4 is commanded through ULN2003 chip by D51 and IN2 is sensed through resistor divider by D7. Can someone explain the function of those pins and if they can be used in current firmware?

tnx

[medo]

Is there a way to use the Tesla OBC Gen 3 for fast charging??

[janosch]

Tesla Gen2 charger ... disable circuit

I listened in to CP & PP with a little circuit and when finding a resistance there the system knew an EVSE was plugged in and vehicle mustn't drive away. That worked for me. However, it might be even easier to use the pins that Damien left there for us.

The only reason I rolled my own circuit at the time was I didn't understand that the signals from the board are open drain.

https://openinverter.org/wiki/Tesla_Mod ... onnections

Discussion here:
viewtopic.php?p=46302#p46302

Relevant circuits here:
https://github.com/damienmaguire/Tesla- ... ematic.pdf

[arber333]

I listened in to CP & PP with a little circuit and when finding a resistance there the system knew an EVSE was plugged in and vehicle mustn't drive away. That worked for me. However, it might be even easier to use the pins that Damien left there for us.

The only reason I rolled my own circuit at the time was I didn't understand that the signals from the board are open drain.

https://openinverter.org/wiki/Tesla_Mod ... onnections

Discussion here:
viewtopic.php?p=46302#p46302

Relevant circuits here:
https://github.com/damienmaguire/Tesla- ... ematic.pdf

Thank you for the data and drawings.

I saw a strange behaviour with Tesla charger. Charger will pull EVSE in and start charging. All of a sudden charger will drop chage and reset. Happened multiple times now. Strange!!! I traced this to aux battery being lowish. Whenever car would stay in a garage long time this would happen and after resetting charge and harrowing clacking of the DC system in a while charging would begin. It seems Tesla gen2 charger circuit is sensitive to 12V input.
I made a simple test. I left the car for some time and then tried to charge. Yep it dropped out and reset.
Then i turned the car ON for some time so that DCDC would have time to charge the aux battery.
After thet when i plugged EVSE in it would charge normaly.

In the end i have decided to go for 2phase Outlander/Eltek chargers which will use the existing cooling circuit and main VCU that is allready there.
Dual cooling systems and VCU and control systems can cause more problems so i will streamline this as much as possible.
Additionaly the bulky charger at the back steals a lot of the trunk area. Mazda is a small car...
Since my daughter is driving this car i intend to make the experience as easy as possible.