how to determine PSU wattage

[shimi]

On Wed, Jul 31, 2013 at 7:35 PM, Oleg Goldshmidt <pub at goldshmidt.org> wrote:

>
> Hi,
>
> Is there a way to determine the nominal PSU power without taking the
> computer apart (actually, preferably without powering it down)? Is there
> any vendor information that Linux could in principle read? It's a
> vanilla home desktop, not a brand name server.
>
> I know of dmidecode and lshw, but neither returned anything for
> PSU. There is nothing on the outside of the PSU that I can find (well,
> it does say "220Vac").
>
> Can acpid help? Am I out of luck?
>
>
>
Assuming you can indeed measure the consumption of ALL the components on
your computer (which I believe you cannot) - you still need to account for
energy being converted to plain heat inside the PSU itself. This can easily
get to 20% or even more on lousy PSUs.

Products such as this:
http://www.powersaver.co.il/pl_product~EM-IL-01~3~0.htm will tell you how
much the device really takes from your wall socket (not including heat
wasted on wires resistance from IEC's meter to your socket ;))...

HTH,

-- Shimi
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