Re: recharger power consumption

Thanks for the comments.

Input: 100-240V ~ 50/60Hz 0.1A

So in the above, the max consumption would be

240 * 0.1 = 24 Watts

Although even when recharging a battery it may actually be less than
this.

And when nothing is attached .... the only thing you can be sure of is
that it will be less than that!

I think we'll leave them plugged in. Otherwise someone is bound to plug
their phone in and walk away without checking if the charger is
actually switched on.

default wrote:
On 19 Dec 2006 09:33:39 -0800, cbdeja@xxxxxxxxxxx wrote:

We have several rechargers (for mobile phones and torches) which are
permanently plugged in and switched on, and the phones/torches are
attached whenever they need recharging.

I'd assumed that the rechargers would use a negligable amount of power
when a phone or torch was NOT attached. Howevever as there are 5 of
them and they are "on" 24/7 I'd like to find out how much power they
are using (and the cost!) when in use and more importantly when NOT in
use.

For example, one mobile phone charger is rated as

Input: 100-240V ~ 50/60Hz 0.1A
Output: 5.9V 375mA

Actually I'm not sure what figures here tell me what it's power
consumption is either when recharging or with no phone attached. Can
anyone clarify this for me?

The figures they state are usually "worst case" the bottom end of the
specification (most power consumed)

You can't predict the cost of operation accurately, based on just the
nameplate ratings or even measuring current and voltage and computing
watts. And your power company's billing criteria may further
complicate reaching a meaningful answer.

If something is using a couple of watts, when it is off, the cost to
me is ~$15 a year - for that amount, and depending on how often I use
it, I'll usually put in a switch or unplug it to turn off the power.
The switch pays for itself.

If the case gets warm when it is off - its a good candidate for a
switch - in my opinion. Warm means you have some proof it is
dissipating power - and it is subjective and inaccurate . . .

Large items like microwaves, VCRs, TVs, Audio systems are impossible
to judge with just the feel test - the case is large with respect to
the power so the temperature rise isn't noticeable. I went around
with a voltmeter and ammeter and measured everything I use, on and
off, put the numbers in a spread*** and calculated out the costs -
not accurate, but better than nothing.

A switch on the water heater so you can turn if off when not in use or
you're on vacation would probably do more to lower the bill than any
50 battery chargers. I have a neon light that indicates the water
heater is turned on, and an LED to indicate it is actually heating
water. 25% of my usage evaporated with just hot water conservation.

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