Which battery runs the heater?

[MoonRiver]

I just noticed that my 12v battery soc dropped 22% from 86 to 64 in 4 days after driven toltal 55 miles. During these days, only heater and fan were on. Is the LVB the only battery runs the climate control?

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[hybrid2bev]

It’s the high voltage battery that powers the climate control. 12v SOC fluctuations are normal.

 

[Maquis]

The PTC heater and compressor are powered by the HVB, but the controls, fan, valves, and (I think) the circulating pump are 12V.
@Mach-Lee could probably confirm or correct me.

 

[Mach-Lee]

The PTC heater and compressor are powered by the HVB, but the controls, fan, valves, and (I think) the circulating pump are 12V.

Correct.

 

[David bernd]

how do you find out the status of your 12 volt battery?

 

[Snakebitten]

how do you find out the status of your 12 volt battery?

Not easy to do without a voltmeter on it.
And that's not easy to do without waking up the vehicle and then getting a reading that doesn't represent the actual resting voltage.

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