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:

1. Apple A1357
2. Apple A2347
3. 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:

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:

It’s clear that my USB chargers consume less standby power at 120V 60Hz than at 230V 50Hz.