HVAC supply voltage

[bloo]

I've a question that I hope someone in the EV sphere can answer. What part of the Slate's electrical system will power the HVAC - primary or secondary ?

A DC motor to run the AC compressor off 12-Volts is less expensive than a motor and motor drive needed for the primary high-voltage side. It would be safer to run electric heater coils off 12-Volts.

However, the current demand to run HVAC off 12-Volts would be huge. So any cost savings you get by using cheaper 12-Volt parts will be offset by the monster DC-DC converter needed to run them. And you can count on a 10% efficiency hit from a converter like that, to boot.

Or maybe Slate uses a 42-Volt converter for HVAC. That would use about 1/3 the current for the same power, and still be a lot safer than connecting directly to the high-voltage primary.

So... does anyone know how the HVAC will be powered ?

 

[bloo]

So... I just did a bit of research. Both Teska and the Chevy Bolt power HVAC direct from the battery. I guess Slate will also do it that way.

 

[KJRaven]

So... I just did a bit of research. Both Teska and the Chevy Bolt power HVAC direct from the battery. I guess Slate will also do it that way.

Correct, the HVAC system will be high voltage. you can see in this video the ac compressor with the orange cables going to it. they discuss the system a little as well.

 

[DONNY]

I've a question that I hope someone in the EV sphere can answer. What part of the Slate's electrical system will power the HVAC - primary or secondary ?

A DC motor to run the AC compressor off 12-Volts is less expensive than a motor and motor drive needed for the primary high-voltage side. It would be safer to run electric heater coils off 12-Volts.

However, the current demand to run HVAC off 12-Volts would be huge. So any cost savings you get by using cheaper 12-Volt parts will be offset by the monster DC-DC converter needed to run them. And you can count on a 10% efficiency hit from a converter like that, to boot.

Or maybe Slate uses a 42-Volt converter for HVAC. That would use about 1/3 the current for the same power, and still be a lot safer than connecting directly to the high-voltage primary.

So... does anyone know how the HVAC will be powered ?

I've a question that I hope someone in the EV sphere can answer. What part of the Slate's electrical system will power the HVAC - primary or secondary ?

A DC motor to run the AC compressor off 12-Volts is less expensive than a motor and motor drive needed for the primary high-voltage side. It would be safer to run electric heater coils off 12-Volts.

However, the current demand to run HVAC off 12-Volts would be huge. So any cost savings you get by using cheaper 12-Volt parts will be offset by the monster DC-DC converter needed to run them. And you can count on a 10% efficiency hit from a converter like that, to boot.

Or maybe Slate uses a 42-Volt converter for HVAC. That would use about 1/3 the current for the same power, and still be a lot safer than connecting directly to the high-voltage primary.

So... does anyone know how the HVAC will be powered ?

I don't know but my Chevy S 10 has such a small tight cab that I have to crack the window to close the door completely. And it heats up in minutes.