Electronic – Calculating power consumption in portable air conditioning unit

power-consumption

Apologies for this likely very simple/stupid question.

I have a portable AC (air conditioning) unit that's supposed to be "energy efficient". On the back of the unit, it tells me some details about the unit's power consumption:

Voltage: 115 V-60 Hz
Current consumption: 11.4 A
Cooling capacity: 4100 W (14000 BTU/h)

So here's where I'm a little confused. I see the 4.1 kW and I'm a little confused, because my limited understanding of electricity would be that the power consumption shouldn't exceed the voltage multiplied the current (in this case, 1311 W). Does this mean that my unit is drawing 1.3 kW/h of electricity, or 4.1 kW/h? If it's the former, how does it output more than 3x the power that it draws in?

Also, I was wondering if my power consumption remains constant with this unit plugged in (whether at 1.3 kW/h or 4.1 kW/h), or if it will fluctuate based on the settings? In other words, are the numbers listed on the unit supposed to represent how much power it will draw in no matter what, or does that represent the maximum amount of power it will draw (meaning that it could draw less if I, for example, didn't need as much cooling)? Apologies for my limited understanding here, but just want to make sure I can get a roughly-accurate estimate for my upcoming power bill.

Best Answer

Cooling capacity can exceed power consumption because it's moving heat from one place to another, not creating it.

Those ratings don't actually tell you the power consumption, but it should be less than 1311W, because 1311 is the VA (volts * amperes) and we don't know the power factor.

If you want to know the actual power consumption you can measure it with a device like a Kill a Watt or maybe there are additional specifications available.

The actual power consumption will vary with the settings and the operating conditions (temperature and humidity). The A/C unit turns on and off to try to maintain the temperature. If it is off all the time it draws nothing or maybe a tiny bit for the remote control etc., if it runs all the time it uses the maximum.

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