Wall connector standby current draw

[Billee]

I have a 14-50 wall connector and I noticed the electronic box stays warm while not connected to the car. It measures 12 deg. F above ambient. I'm wondering how much power I am wasting by leaving it plugged in. Does anyone know the rated standby power?

 

[Sophias_dad]

Do you mean UMC or HPWC(with 14-50 connection)?

 

[GtiMart]

Do you have a "kill-a-watt" or other power monitoring tool for a 120V plug? If so, just plug it in that using the 5-15 adapter. The idle draw of the mobile connector should be the same whatever the plug...

 

[Billee]

Do you have a "kill-a-watt" or other power monitoring tool for a 120V plug? If so, just plug it in that using the 5-15 adapter. The idle draw of the mobile connector should be the same whatever the plug...

I measured the current at 120 volts and it was about 5 watts. It gets hotter when plugged into 240 volts so I assume it is using more power.

 

[Billee]

Do you mean UMC or HPWC(with 14-50 connection)?

UMC

 

[GtiMart]

Ah, ok... technically a circuit that doesn't deliver power shouldn't have any loss, I think. The internal "intelligence" should always consume roughly the same power. Based on assumptions and whatever I learned over the years, but I'm not an electrical engineer. maybe there is more loss when the internal circuitry is powered by 240V instead of 120? I would still assume it's close... if you leave it as long plugged in 120V vs 240V, does it get marginally hotter or a lot hotter?