Navitron Renewable Energy and Sustainability Forum

Energy/Electricity Storage and Use/Grid Connection => Low Energy Computing => Topic started by: chasfromnorfolk on December 13, 2016, 11:22:55 AM



Title: Apple Airport Express: running costs?
Post by: chasfromnorfolk on December 13, 2016, 11:22:55 AM
Made redundant by the delivery of a new router, I disconnected an Airport for the first time in about 4 years and discovered it was running surprisingly hot.
Assuming this to be normal (the other one in the house is hot too, I now discover) it rather begs the question: how much are these little 'wall heaters' costing to run p.a.?

Anyone know? Model A1264 in case it's relevant. Whatever it is, I'm pleased to have halved consumption... they're on 24/7.

Chas


Title: Re: Apple Airport Express: running costs?
Post by: sam_cat on December 13, 2016, 03:04:18 PM
Made redundant by the delivery of a new router, I disconnected an Airport for the first time in about 4 years and discovered it was running surprisingly hot.
Assuming this to be normal (the other one in the house is hot too, I now discover) it rather begs the question: how much are these little 'wall heaters' costing to run p.a.?

Anyone know? Model A1264 in case it's relevant. Whatever it is, I'm pleased to have halved consumption... they're on 24/7.

Chas

Invest in one of those Kill-A-What plug through meters, it will tell you how much is being used on a per device basis.. Great for finding out which devices are 'naughty'


Title: Re: Apple Airport Express: running costs?
Post by: jonesy on December 13, 2016, 08:42:06 PM
The quick and dirty and usually pretty close way to get an idea of cost is to look at the power consumption stamped on the adapter, and that is the cost in each year. So if it states 5W, that's  5 pa.


Title: Re: Apple Airport Express: running costs?
Post by: chasfromnorfolk on December 14, 2016, 11:18:32 AM
Thanks, both. - a quick eBay search has meters at a tenner or so, so that looks like a useful bit of kit to be had.

No wattage on the unit or packaging, but a .2A rating(declared)  at 240v is 48 watts? So, more like 50 pa?
I'll bung the meter on the other one asap.

Chas


Title: Re: Apple Airport Express: running costs?
Post by: jonesy on December 14, 2016, 03:58:08 PM
I'd think it's closer to 5W, else you'd burn your hand.  All the energy consumed ends up as heat.
There are 2 things to consider with these plug in power meters; it's really quite tricky to produce a meter that is accurate at say 10W and also at 3000W. There's also a bunch of meters, usually the cheap ones, that don't measure power in watts.  They measure VA, often mis-labelling it as watts. The result is a reading significantly higher than reality for a lot of modern appliances.
If you have an old fashioned 15W lamp, like those used in ovens, see what that reads. If you then plug in a 15W rated router and it reads 30W then you know your meter is junk.


Title: Re: Apple Airport Express: running costs?
Post by: smegal on December 14, 2016, 04:23:36 PM
Thanks, both. - a quick eBay search has meters at a tenner or so, so that looks like a useful bit of kit to be had.

No wattage on the unit or packaging, but a .2A rating(declared)  at 240v is 48 watts? So, more like 50 pa?
I'll bung the meter on the other one asap.

Chas

I'd hope that the amperage shown will be at the DC voltage (12?)


Title: Re: Apple Airport Express: running costs?
Post by: TheFairway on December 14, 2016, 08:17:56 PM
Its about 2-3W / 6VA - not static but it was starting up. So long since i used it, it failed to get full network connection.

Not sure what version - text to small to read. But i think its the same model by sounds of it.