Don’t even attempt this. You’ll get aluminum shaving on the cell taps if u mange to not touch them. This is a very bad idea I agree. I had considered using nibbler type shears, which do not produce swarf but there is probably not enough clearance between the housing and the battery cells to operate...

I have always used the battery with the internal Tesla BMS. It is a complete sealed pack. The faulty cell 39 continues to lose voltage and is presently 138mV lower than the rest. I am considering cutting a hole in the bottom plate in the vicinity of cell 39 to attach charging wires/probes. This woul...

Just for information. The Model3 pack which I have been using for solar storage for the past two years has just developed a cell imbalance. This happened in the last two weeks and I noticed it on the Tesla CAN data which I continuously display. A cell difference of 20mV to 80mV is reported on cell n...

The different of the 2 groups is the mux (or page with settings that you send) A complete dataset needs 2 messages to send all data for this ID and has 2 mux/pages I see that the message is multiplexed but the two messages which I send are both mux1 and the only difference in the second message, ac...

I have seen Vehicle CAN data logs from ModelY cars which give 16 different versions of 0x221 when in Drive. These 16 messages are repeatedly sent continuously. I have also seen logs which do not do this. This was 1 year ago. You seem to have a group of 2 messages which is different. Perhaps Tesla ha...

Thanks for your comments. What do you mean by "+on outside stud"? in "3. 12v battery across DC/DC stud terminals, + on outside stud"? I mean there are two stud connectors one positive one negative and the outside one is positive. Another point, the lid screws of the "pentho...

I am still unable to close the contactors; I shorted each of the HIL pins with a small wire. Do you know how I can check if there is damage to the PCS of the battery? Don't know about damage to PCS but have you checked..... 1. Capacitor across the H.V. pins 2. Resistor on X098 across HVIL pins 3. !...

The pins are defined in the esp32_can library by Collin KIdder as Rx=16 and Tx=17. I would suggest you use these defaults. If you look in the library file "esp32_can.cpp" then on line 9 you will see the pin definitions in a "weak assign" statement. Collin's comments in this file ...

There is only one high-voltage connector for the single-engine tesla model's battery. There is also another connection under the penthouse, which is for the heater and/or compressor, that has small extra contacts; do we need to short them also? Also, there are small extra contacts for the charger p...

I was referring to the HVIL pins. High Voltage Interlock Loop. This is an electrical loop which must be intact to allow the battery to energise. The electrical circuit loops through each high voltage connector , the data connector and even one of the lid screws of the "penthouse" cover. On...

Here are the original attachments from EVTV These are a remnant of the Model S parts of the program which are not used in Model3 mode. They are required however to make my hacked code compile. I hacked the code purely to demonstrate model3 functionality and the code would need tidying up for more se...

I have been asked to provide a diagram of my system which achieves contact closure and display of data on an Arduino Due. Here it is. And of course the can lines should be terminated with 120 ohms

Use vehicle Can bus on pins 15,16
Fit a capacitor across the H.V.
I used an Arduino Due but it may work with an ESP32, I don't know. It does have a CAN interface.

I have done successful test of 25A charge (even with Regen set to 0kW perhaps it a reported limit but maybe not an "audited" limit?) using the HV_UP_FOR_DRIVE commands. Hi parallaxengineering, That is very interesting and maybe we have improved the charge rate tolerance by using these two...

To elaborate on the 0x221 message. I looked at various model 3 log files from the web and notice that these messages are always sent in a series of 16 each one different but repeated. Further, the group of 16 sent before POWER_UP_FOR_DRIVE is different from the group sent after. I tried sending the ...

I was premature in announcing that I had got 85Kw regen power. What I got was regen power of 85Kw which then decays down to Zero over a few seconds. The 0x2D1 message seems not to be significant . It only looked like it was under certain timing conditions. I have got HV_UP_FOR_DRIVE but no regen. I ...

EDIT *** I later found that the 0x2D1 made no difference and that the Regen power decayed back to zero *** *** it looks like the extra 0x221 does cause increased discharge current capacity though ! *** I have managed to get HV_UP_FOR_DRIVE together with Regen power of 85Kw I did this by sending two ...

Curiosity got the better of me and I tried sending 0x2D1 with FF 02 alongside the message 0x221 to close the contactors. It made no difference. The contactors closed but I still got HV_UP and the regen power stayed at zero. So there is a little more to this.

Has anyone had success in getting the battery into "HV_UP_FOR_DRIVE"? There we will have the full power potential. I have just had a look at some CAN dumps which show the presence of HV_UP_FOR_DRIVE. It appears that this status is achieved after sending the message 0x2D1 with two data byt...

Open.csv An update on my Model3 battery setup. I have been running for several months charging from a 5.5Kw solar array at a maximum of 12Amps and discharging into an inverter at a maximum of 3Kw. That all works fine. This last week I have connected a 400v 12Kw dc diesel driven generator to charge ...

Has anyone been able to get the model 3 battery pack contactors to close without a capacitor of some sort connected across the HV output? I'm wondering if this has been my problem all along. To be clear, I connected a 1000uF 450v capacitor across one of the motor output connectors. Both the motor c...

The Model 3 works by taking your 12V input and using a DC/DC converter to "precharge" by literally generating the full pack voltage from 12V. I don't entirely know why they did that, probably so they don't need a precharge resistor. Probably because they didn't like using a precharge R. w...

Here is my initial Arduino sketch to display data from the Model 3 battery and operate the contactors. It is based on the EVTV program for the Model S. The cell voltage display is commented out but does work. Send "c" to toggle the contactors on/off. There are a lot of remnants from the or...

I now have contact closure! I needed a capacitor across the HV output presumably to satisfy the charge up time of the precharge process. The contactors take a lot of current at the start and the dcdc converter puts out a lot of voltage too, I saw almost 20v across the battery terminals for a moment....

M3221init.csv Interesting observations today. The "pinging" in the coils stops when I remove the links on the Front and rear drive connector sense pins so that confirms the loop is ok. The pinging is not stopped when I remove the supercharger and ac charger connectors. I am currently send...