Totally agree with you about leaving the SOC icon/energy gauge in percent versus estimated range! Thanks for the 50C temperature figure as well. Cheers.
I love your videos. Love how you explain key concepts behind the car's functionality and use the app to help explain it. I also like how you showed us around the car a bit in this one. I actually love poking around my cars and learning where things are physically, how to get to them, what work I can do on them. I'm much more cautious with my new model 3 but seeing how I can at least look at and understand different parts without damaging anything (or even "working on it") would be great.
Excellent video Josh! As a M3 driver and a techie I like to learn more about the car. This is extremely helpful. Sorry to hear that you are still in a strict lock down. We in the Netherlands are still allowed to drive (needless to say I do :) ). Also thanks for calculating Fahrenheit back to Celsius; saved me a google search!
Most of us are allowed to drive, we just don't have many places to go with work and vacations cancelled. Sorry that I often flip between F and C, but such is life here
That is right - the roadster was a development by "A/C Propulsion" (The T-Zero)- the Inverter technology, on board fast charge ability and the ability to send power back out to the grid or house(this last Elon has talked about but not developed). The only difference is that A/C Propulsion did not have Lithium Batteries.
You know your history I was lucky enough at one time to have an AC propulsion drive unit but never got the chance to put it in a car just the inverter in the little motor was really something to see. I think they also have their drive set up in a Scion
I thought Tesla was doing something very different very special with their BMS, but I got to know it's pretty much a regular BMS connected to a huge display. Anyways, Thank You So So Much. 😊 That was a great explanation.👌👌
I've been running ScanMyTesla along with the Stats app for a few months and have learned to take the Stats battery health estimate with a grain of salt. Stats uses the "SOC expected" as shown in SMT when calculating range. If your battery is cold it will throw off the numbers and look like range loss. Once your pack is at temp, in SMT the SOC and SOC expected will match. The nominal full pack and Energy buffer readings in SMT or tesLax are a more reliable measurement of battery health. My LR RWD is showing 77.6 kWH and 3.50 kWh Energy buffer at 7,800 miles, but have seen it dip to 77.5 before bouncing back. I soon expect to see 77.5 or lower as the new normal. I've seen 77.9 kWh NFP reported for the LR when new.
A little note about the 18650 laptop batteries used in the early Tesla cars. There was a very early reference to the notion of using laptop batteries in an electric car clear back in 1993. It came from retired Chairman and CEO of Hughes, Malcolm Currie, and was directed at GM. I learned this upon reading journalist Michael Shnayerson book on the EV1 "The Car That Could". At a 1993 luncheon including employees from Hughes and GM, Currie put forth the notion of using “hundreds of small laptop batteries” in an EV conversion. Currie taunted the GM execs, suggesting that GM could do conversions with such an approach for as little as $10,000 a car. The idea didn't catch on at the time, but Currie had a much bigger idea than he may have even imagined at the time. ;>
You need an OBDlink and a OBD harness to use the phone apps. Options are different for logging with computer. And I will be coming out with a self-contained option in a few weeks
@@TechTesla Thanks for the reply, but I meant more so for your HUD of battery temps in the ac vent! Like microprocessor, and whatever CAN transceivers used
How is Teslax connected to the car - the app says "additional wiring and installation is necessary" So plugging into the OBD connector is not enough? Do you use the free app or the "extra strength subscription or XS 2.0 ?
Teslax needs to be connected to a canserver or supported bluetooth OBD dongle, and those need to be connected to a tesla to OBD harness for your particular car. Yes extra strength teslax is needed for all the data you see in my videos
@@TechTesla so, example is the channel BfullKWhNom352- you renamed this to pack nominal capacity or something. without the original name from the search in the signal list, it's hard to replicate some of your readings without a lot of trial and error
Awesome content I would love a video about how the algorithms that determine max charge current / power work I have plans to use these cells in the future and would be great to be capable of having charging speeds close to what they get in 3 or Y, so essentially reverse engineer the what they do, of course also paired with a custom cooling system that is capable to cool the cells
Well its tough to know the secret sauce of battery constants outside of tesla, but you could reverse back from the charge and discharge rates of the cars and divide by the number of cells
The range estimate has nothing to do with charging and everything to do with driving. It looks at several large discharge cycles. Best you can do is drive longer and more often.
i thought the 12V batteries function was to closed the two contactors when the car wakes up from sleep. From memory, the contactor connected to the negative side of the HV bus closes before the contactor connected on the HV positive side. This allows time for a current limiting shunt on the positive side to pre-charge the HV bus. I have not read that the 12V from the battery is up-converted to pre-charge the HV bus. Can anyone confirm this? Supply document links discussing the HV pre-charge method used by Tesla?
What's the benefit for doing this? I've never let my car sit at a high SOC, and only charge to 90% if I'm going on trips. Is there any benefit to balancing the packs?
From the service manual: The best way to balance the Model 3 pack is to set charge limit to 90% or higher and let the vehicle sit idle for hours (plugged in or not). 24 hours of balancing can reduce imbalance by 1mV.
It doesn't have to be plugged in to balance, jus recommend charging to about 90 (no need for 100) and let it sit for a while. You won't see a new range number until after your next long drive though.
@Faith Lawless sadly we have seen wildly differing reports from Tesla employees on what to do. By all means, try what they say. But also try giving it some time and a good drive.
Totally agree with you about leaving the SOC icon/energy gauge in percent versus estimated range! Thanks for the 50C temperature figure as well. Cheers.
I love your videos. Love how you explain key concepts behind the car's functionality and use the app to help explain it. I also like how you showed us around the car a bit in this one. I actually love poking around my cars and learning where things are physically, how to get to them, what work I can do on them. I'm much more cautious with my new model 3 but seeing how I can at least look at and understand different parts without damaging anything (or even "working on it") would be great.
Thanks! Of course there's a lot less stuff (or need) to work on than a normal car. Perhaps I'll think of something else to dig into soon.
Excellent video Josh! As a M3 driver and a techie I like to learn more about the car. This is extremely helpful. Sorry to hear that you are still in a strict lock down. We in the Netherlands are still allowed to drive (needless to say I do :) ). Also thanks for calculating Fahrenheit back to Celsius; saved me a google search!
Most of us are allowed to drive, we just don't have many places to go with work and vacations cancelled. Sorry that I often flip between F and C, but such is life here
That is right - the roadster was a development by "A/C Propulsion" (The T-Zero)- the Inverter technology, on board fast charge ability and the ability to send power back out to the grid or house(this last Elon has talked about but not developed). The only difference is that A/C Propulsion did not have Lithium Batteries.
You know your history I was lucky enough at one time to have an AC propulsion drive unit but never got the chance to put it in a car just the inverter in the little motor was really something to see. I think they also have their drive set up in a Scion
do you have Tesla M3 battery slave bms wiring diagram, and component location, where are the bleed brick resistors located etc?
Great information. Thanks for the work you do and sharing of info.
I thought Tesla was doing something very different very special with their BMS, but I got to know it's pretty much a regular BMS connected to a huge display.
Anyways, Thank You So So Much. 😊 That was a great explanation.👌👌
Do you have an opinion on the Stats app estimation of battery health?
I've been running ScanMyTesla along with the Stats app for a few months and have learned to take the Stats battery health estimate with a grain of salt. Stats uses the "SOC expected" as shown in SMT when calculating range. If your battery is cold it will throw off the numbers and look like range loss. Once your pack is at temp, in SMT the SOC and SOC expected will match. The nominal full pack and Energy buffer readings in SMT or tesLax are a more reliable measurement of battery health. My LR RWD is showing 77.6 kWH and 3.50 kWh Energy buffer at 7,800 miles, but have seen it dip to 77.5 before bouncing back. I soon expect to see 77.5 or lower as the new normal. I've seen 77.9 kWh NFP reported for the LR when new.
A little note about the 18650 laptop batteries used in the early Tesla cars. There was a very early reference to the notion of using laptop batteries in an electric car clear back in 1993. It came from retired Chairman and CEO of Hughes, Malcolm Currie, and was directed at GM. I learned this upon reading journalist Michael Shnayerson book on the EV1 "The Car That Could".
At a 1993 luncheon including employees from Hughes and GM, Currie put forth the notion of using “hundreds of small laptop batteries” in an EV conversion. Currie taunted the GM execs, suggesting that GM could do conversions with such an approach for as little as $10,000 a car. The idea didn't catch on at the time, but Currie had a much bigger idea than he may have even imagined at the time. ;>
Id like to see a video on hardware used to capture can messages! Great vid btw need more in depth videos like this one on this stuff
You need an OBDlink and a OBD harness to use the phone apps. Options are different for logging with computer. And I will be coming out with a self-contained option in a few weeks
@@TechTesla Thanks for the reply, but I meant more so for your HUD of battery temps in the ac vent! Like microprocessor, and whatever CAN transceivers used
@@kross1001 Yes, check back in a few weeks
@@TechTesla Awesome!
Is any can bus commands is gonna be available? I will help a lot of peoples.
How is Teslax connected to the car - the app says "additional wiring and installation is necessary" So plugging into the OBD connector is not enough? Do you use the free app or the "extra strength subscription or XS 2.0 ?
Teslax needs to be connected to a canserver or supported bluetooth OBD dongle, and those need to be connected to a tesla to OBD harness for your particular car. Yes extra strength teslax is needed for all the data you see in my videos
This is great content, but could you include the names of the signals you are using? There are a ton in TESLAX and its hard to know which is which.
That's the idea behind my TesLax videos, to explain and suggest several signals of interest. Their names are shown in the app.
@@TechTesla so, example is the channel BfullKWhNom352- you renamed this to pack nominal capacity or something. without the original name from the search in the signal list, it's hard to replicate some of your readings without a lot of trial and error
Awesome content
I would love a video about how the algorithms that determine max charge current / power work
I have plans to use these cells in the future and would be great to be capable of having charging speeds close to what they get in 3 or Y, so essentially reverse engineer the what they do, of course also paired with a custom cooling system that is capable to cool the cells
Well its tough to know the secret sauce of battery constants outside of tesla, but you could reverse back from the charge and discharge rates of the cars and divide by the number of cells
Balancing can happen while charging for sure. Not just sitting still.
Josh, I downloaded teslafi
Hi, quick question. Is there a certain way you’d recommend to charge if I’m trying to keep the range estimate calibration as accurate as possible?
The range estimate has nothing to do with charging and everything to do with driving. It looks at several large discharge cycles. Best you can do is drive longer and more often.
i thought the 12V batteries function was to closed the two contactors when the car wakes up from sleep. From memory, the contactor connected to the negative side of the HV bus closes before the contactor connected on the HV positive side. This allows time for a current limiting shunt on the positive side to pre-charge the HV bus. I have not read that the 12V from the battery is up-converted to pre-charge the HV bus. Can anyone confirm this? Supply document links discussing the HV pre-charge method used by Tesla?
What's the benefit for doing this? I've never let my car sit at a high SOC, and only charge to 90% if I'm going on trips. Is there any benefit to balancing the packs?
From the service manual:
The best way to balance the Model 3 pack is to set charge limit to 90% or higher and let the vehicle sit idle for hours (plugged in or not). 24 hours of balancing can reduce imbalance by 1mV.
So you're saying leave in plugged in at 90% to balance packs?
It doesn't have to be plugged in to balance, jus recommend charging to about 90 (no need for 100) and let it sit for a while. You won't see a new range number until after your next long drive though.
@Faith Lawless sadly we have seen wildly differing reports from Tesla employees on what to do. By all means, try what they say. But also try giving it some time and a good drive.
Josh, I would like to know how to install the necessary hardware to use the TesLaX app. (Please contact me at my email in my previous comment.)
What is one way to contact you? Facebook Instagram email?
There should be a contact link on the channel page, of course email is great or in any of the tesla forums