I did some tests with my USB chargers: how much power do they consume when plugged into a power socket without charging any device (standby)?
The devices I tested are:
- Apple A1357
- Apple A2347
- Anker A2053
- No-brand: Chacon EMP604USB
I connected each one to a powermeter and let it measure the standby power consumption for 24 hours.
This is the result:
|Model||24 hours (Wh)||1 hour (Wh)||1 year (Wh)|
|No-brand: Chacon EMP604USB||5,6473||0,2353||2061,2645|
24 hours is the measured data, the “1 hour” and “1 year” columns are calculated based on the 24 hours data.
The no-brand USB charger consumes the most: around 2 kWh per year, which is still less than a switched off Philips Hue lamp.
Using the same cost as for the Philips Hue lamp, that no-brand charger costs me around €1 if I would leave it plugged in for a whole year without letting it charge anything.