I have 2 servers running 24 x 7 in my office. Both are pretty old but have done the business for over 5 years non-stop which is pretty good, but I’m thinking of changing them for a single low consumption server that will do the job of both existing servers.
The problem I have is that I don’t have much of a clue about ‘leccy stuff but I want to work out roughly how much power they’re using.
I do know (from the interweb) that one of them uses about 1 amp and the other about 1.2 amps. Does that help?
According to interweb tests the potential replacement uses a max of 30w but is 16w at rest.

http://www.amazon.co.uk/gp/product/B002OL1L7E/

P=I*V so at 230 Volts and 1 amp the power would be 230W. That’s roughly one unit every four hours and what does a unit cost now, 17p? Reality may vary, get one of those things Cougar suggests.

Hard to say. If there’s a current rating, that’ll probably be peak rather than average.
As a ball-park figure, a PC not doing anything too taxing like graphics will be using about 60 – 100Ws (excluding monitor)

So that’s 0.06 -> 0.1 *(365*24) * 15p = £78 ->£130 quid a year
at 16W -> 30W 0.016 -> 0.03 *(365*24) * 15p = £21 ->£39 quid a year

But you really need an energy meter to check for certain.

Well IF one of them is using 1.2 amps that would be costing £30/month compared with £3.30 for a Mac Mini using a max of 30w (would average less as it would be idle for most of the time)!
no wonder I pay £100/month for ‘leccy 🙁

Think I need to buy one of those plug in meters.