I did not explicitly specify in my post “Quickpost: Standby Power Consumption Of My USB Chargers” that I did my tests here in Flanders, Belgium and thus that the mains electricity is 230V 50Hz.
I wondered what the results would be in other parts of the world, like the USA. To answer this question, I redid my tests with the USB chargers powered by an AC power supply that delivers electricity at 120V and 60Hz.
The devices I tested are:
- Apple A1357
- Apple A2347
- Anker A2053
The no-brand USB charger was not tested, as the input specs specify 220V – 240V.
I connected each one to the AC power supply (120V 60Hz) and used a powermeter (GPM 8310, resolution 0,1 µW) to measure the standby power consumption over 24 hours.
This is the result:
|Model||24 hours (Wh)||1 hour (Wh)||1 year (Wh)|
24 hours is the measured data, the “1 hour” and “1 year” columns are calculated based on the 24 hours data.
And here is the summary for 120V and 230V:
|Model||1 hour (Wh, 120V 60Hz)||1 hour (Wh, 230V 50Hz)|
It’s clear that my USB chargers consume less standby power at 120V 60Hz than at 230V 50Hz.