Model Y Wiring

[lasdj]

I read before that the model y will have less wiring than all the cars currently and the interior will be different. But after the unveil it does look like a bigger version of the model 3. Hopefully the design will change a bit when it goes into production.

Tesla Model Y To Ditch 12-Volt Battery, 95% Less Wiring Than Model 3

 

[Thomas Edison]

I read before that the model y will have less wiring than all the cars currently and the interior will be different. But after the unveil it does look like a bigger version of the model 3. Hopefully the design will change a bit when it goes into production.

Tesla Model Y To Ditch 12-Volt Battery, 95% Less Wiring Than Model 3

That’s from when the Y was going to be a new generation of car. They scrapped that plan a while ago.

 

[Swampgator]

That’s from when the Y was going to be a new generation of car. They scrapped that plan a while ago.

No Elon has talked about it recently. New wiring harness for sure. I'll bet the 12V is gone as well, but he is unlikely to say anything about that until the Q1 results call in May

 

[gavine]

No Elon has talked about it recently. New wiring harness for sure. I'll bet the 12V is gone as well, but he is unlikely to say anything about that until the Q1 results call in May

I'm curious, from a technical standpoint, how they are going to handle the 12V void. It would be great to see it gone though. Extra weight and a maintenance item.

 

[Swampgator]

I think they could step down to 12V from the high voltage pack, but probably best to allocate a small part of the battery to low voltage that can still be isolated from the high voltage pack when needed/required. Also the entire legacy 12V system could be re-imagined. I don't know the technical either. Obviously a low voltage system is needed for safety so that monitoring functions etc can still work in the event the high voltage pack is disconnected (crash, repair, etc)

 

[gt2690b]

I think they could step down to 12V from the high voltage pack, but probably best to allocate a small part of the battery to low voltage that can still be isolated from the high voltage pack when needed/required. Also the entire legacy 12V system could be re-imagined. I don't know the technical either. Obviously a low voltage system is needed for safety so that monitoring functions etc can still work in the event the high voltage pack is disconnected (crash, repair, etc)

seems feasible to design some kind of kirk key interlock that will isolate a 12V portion of battery the HV battery in the event of HV pack disconnect and use a DC-DC converter under normal operation

 

[gavine]

I think they could step down to 12V from the high voltage pack, but probably best to allocate a small part of the battery to low voltage that can still be isolated from the high voltage pack when needed/required. Also the entire legacy 12V system could be re-imagined. I don't know the technical either. Obviously a low voltage system is needed for safety so that monitoring functions etc can still work in the event the high voltage pack is disconnected (crash, repair, etc)

I hadn't thought of it being isolated cells. That makes sense. My bewilderment was around the HV contactor. It is open when the car is off but it would need to be closed in order to provide the current for DC to DC down to 12V. Unless they have some kind of smaller contactor that only pulls 12V from the main pack. Looking forward to learning about this when they are ready to disclose the specs.

 

[CoastalCruiser]

I'm curious, from a technical standpoint, how they are going to handle the 12V void. It would be great to see it gone though. Extra weight and a maintenance item.

The Model 3 already has two DC-DC converters. The one at the back of the car in the Power Conversion System already produces 12v to take the load off the battery (more so than the Model S/X), a move Tesla apparently made to lengthen the life of the 12v battery.

I don't think it would be too hard, technically, to tap the power from the DC-DC converter to engage the contactors, which route high voltage to the inverter/motor assy. That can be done only by the 12v battery at present. However, since Tesla has not done that to date, there must be a good reason. If I had to guess it would be that it is safety related.

 

[TrevTremaine]

I thought I had heard that Musk/Tesla deferred the new wiring harness until later in deference to getting the product out. If he did indeed delay it, any guess as to when that might get changed? Could this retooling during the shutdown make it happen?

 

[RoBoRaT]

Still have the 12V battery.

 

[LowlyOilBurner]

I’m sure this has been beat to death, but I’m a Tesla n00b, what exactly does the 12v battery do? What maintains it, built in trickle charger that tends the 12v when you charge?

 

[MiaGiada]

I’m sure this has been beat to death, but I’m a Tesla n00b, what exactly does the 12v battery do? What maintains it, built in trickle charger that tends the 12v when you charge?

12v runs almost everything but the drive motors. Fans/lights/locks/computer/etc. When the voltage on the 12v battery drops enough, it gets topped up from the high voltage battery.