Don't want heater on, want vent

[insaneoctane]

Finally put together a youtube channel in an attempt to get supercharger miles.
Uploaded video showing how to remove the connector.

Have you considered a switch VS full time disconnect?

 

[beachmiles]

Have you considered a switch VS full time disconnect?

I was looking into something like that, I think the CAN bus is slow enough for a simple switch. Ive ordered some sample connectors from hirshman that appear to be the same.
4way 1.2 SealStar FA Connector

4way 1.2 SealStar MA Connector

 

[insaneoctane]

I was looking into something like that, I think the CAN bus is slow enough for a simple switch. Ive ordered some sample connectors from hirshman that appear to be the same.
4way 1.2 SealStar FA Connector

4way 1.2 SealStar MA Connector

I'm looking forward to your findings. I'm admittedly hesitant to disable the heater if I will then be battling the AC freezing over and having to manually address that. Really seems super inefficient if Tesla users the heater to reduce AC output. Seriously inefficient.

 

[beachmiles]

Posted the link on Reddit only to get savagly attracted. Please upvote if you get a chance,
Disable the cabin heater in the M3 by unplugging the CAN connector to the cabin heater : TeslaModel3

 

[mcfuzz89]

On top of all of this - I want to be retain auto fan mode with AC off... Loved having that in my Audi - I don't need AC in the winter but i want to fan to auto regulate depending on the temperature (which can be pretty mild in the Bay during the winter months).

 

[Big Earl]

I'm looking forward to your findings. I'm admittedly hesitant to disable the heater if I will then be battling the AC freezing over and having to manually address that. Really seems super inefficient if Tesla users the heater to reduce AC output. Seriously inefficient.

They don't use heat to reduce the AC output. The compressor is variable output and can be ramped down to almost nothing if that's what the cooling demand calls for. Tesla does use subcooling + electric reheat to provide better dehumidification performance in some weather conditions, which is an energy intensive process.

More info on HVAC dehumidification strategies:
https://www.energy.gov/sites/prod/files/2015/11/f27/fupwg_fall2015_duncan.pdf
https://www.ashrae.org/File Library/Conferences/Specialty Conferences/2018 Building Performance Analysis Conference and SimBuild/Papers/C105.pdf

There are more efficient dehumidification options - like adding a condenser coil downstream of the evaporator coil, but those add system complexity. Tesla decided to reducing complexity at the expense of energy consumption.

 

[x t2m x]

I see your point of not wasting the car energy; but at the same time, it's nice to just hit auto and set the temp and let it do it thang. But i see your point, give more options to the user if they go manual.

I agree with you on using the 'Auto' setting and fo'get about it.

 

[beachmiles]

I agree with you on using the 'Auto' setting and fo'get about it.

For me constantly burning 1000-2000 watts to heat the car when it's hot outside and average humidity is a waste of energy even if I was plugged into the wall with unlimited range. If youre living off the grid with solar then it's all good, otherwise please turn off lights when you leave the house as Greta Thunberg would say.

But burning 1000-2000 watts heating the car when it's 90 degrees outside while unplugged & running off a battery is worse. Especially for people like me with no home/workplace charging and a 80mi commute.

 

[Big Earl]

For me constantly burning 1000-2000 watts to heat the car when it's hot outside and average humidity is a waste of energy even if I was plugged into the wall with unlimited range. If youre living off the grid with solar then it's all good, otherwise please turn off lights when you leave the house as Greta Thunberg would say.

But burning 1000-2000 watts heating the car when it's 90 degrees outside while unplugged & running off a battery is worse. Especially for people like me with no home/workplace charging and a 80mi commute.

I’m pretty sure it doesn’t add heat at 90F ambient temps. I’ve only noticed it adding heat in below 60-65 ... maybe around 70 if it’s really rainy and wet, but that’s just going by feeling, not watching actual data.

Note to self: ask for Scan My Tesla for Christmas.

 

[beachmiles]

I’m pretty sure it doesn’t add heat at 90F ambient temps. I’ve only noticed it adding heat in below 60-65 ... maybe around 70 if it’s really rainy and wet, but that’s just going by feeling, not watching actual data.

Note to self: ask for Scan My Tesla for Christmas.

I am looking to get a can setup for scan my Tesla, but in the meantime my DC current clamp meter does not tell lies clamping directly to the power line to the cabin heater. Here is some video evidence, but anyone can pop the side panel and verify my results. It's jumping between 1-1.6kW in this case.

With the scan my Tesla they are seeing higher numbers but close.
Any way to disable heat in Model 3? - Tesla Owners Online

 

[Candleflame]

They don't use heat to reduce the AC output. The compressor is variable output and can be ramped down to almost nothing if that's what the cooling demand calls for. Tesla does use subcooling + electric reheat to provide better dehumidification performance in some weather conditions, which is an energy intensive process.

More info on HVAC dehumidification strategies:
https://www.energy.gov/sites/prod/files/2015/11/f27/fupwg_fall2015_duncan.pdf
https://www.ashrae.org/File Library/Conferences/Specialty Conferences/2018 Building Performance Analysis Conference and SimBuild/Papers/C105.pdf

There are more efficient dehumidification options - like adding a condenser coil downstream of the evaporator coil, but those add system complexity. Tesla decided to reducing complexity at the expense of energy consumption.

we have had some discussions in the australian tesla forum with some measurements and this does not seem to be completely true. The AC is incredibly inefficient at low cooling. something isn't right when the aircon doesn't use that much less electricity at i.e. 28 degrees compared to 40 degrees... In fact, a lot of the saving in consumption just comes from the reduction in the fan speed.