`Blue Lyon`, discussing the energy cost and money 'savings' offered by AT+T's recommendation to

*Turn your iPhone green with a new ZERO Charger*.

Blue Lyon works out that the charger, which claims to use less power on standby, might pay for itself in 44 years, assuming it was displacing an old charger using 0.26 W, left plugged in all the time.

The makers of 'ZERO Chargers' are therefore nominated for the

**Hot Air Oscar for flagrant exploitation of gullible consumers**.

One way to think about this is simply to look at the energy cost of delivery alone, assuming that the delivery involves

**one van making a 5-mile trip**. Typing this into my firefox browser

`5 miles / (13.1 miles per US gallon) * 10 kWh per litre in kWh`

gives

**14 kWh**of transport energy to deliver the greenwart. That corresponds to the energy used by leaving the old charger in for

**6 years**.

## 1 comment:

Here's a possible one for you, David.

There's a company in America that claim they can get a PV cell to produce 300-400 times the amount of electricity of a normal unaided cell by putting it in a balloon. I seriously doubt this, but it'd be good if you took a look anyway, their website is www.coolearthsolar.com. It looks to me like they have their maths wrong. Also, I'd like to point out that the balloon could easily cover 300-400 times the area of the single cell anyway (although I'm guessing balloons are cheaper than PV cells). Either way, take a look!

Craig

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