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) |
| Apple A1357 | 2,8847 | 0,1202 | 1052,9155 |
| Apple A2347 | 1,2723 | 0,0530 | 464,3895 |
| Anker A2053 | 5,0734 | 0,2114 | 1851,7910 |
| 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.
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Didier Stevens 