[geeks] Ran the numbers - V240

[Lionel Peterson]

I didn't do V x A = Watts calculation on an AC load, I took a watt reading of
a commercial power meter that displays Watts consumed on active load in
real-time.

It may not be as accurate as other methods, but it should be consistent across
tests, good enough for relative comparisons.

Where I did use a V x A = Watts calculation was on the Raspberry Pi, which is
a DC load, and I used the worst case, 400% CPU utilization power load, which
should account for PS inefficiencies compared to a regular CPU utilization
load closer to 100-200% utilization.

Kill-A-Watt -
https://www.amazon.com/dp/B00009MDBU/ref=cm_sw_r_cp_api_5rAbAbMDT6ZFS

Lionel

> On Nov 10, 2017, at 1:35 AM, Jochen Kunz <jkunz at unixag-kl.fh-kl.de> wrote:
>
>> Am 09.11.17 um 18:28 schrieb Jonathan Patschke:
>> It claims a
>> maximum input draw (not including the initial inrush) of 500VA, and a
>> maximum DC output of 320W.B  Yours claims 650VA in and 400W out, making it
>> somehow worse, despite being physically larger.
> VA != W
> Energy conversion efficiency is based on active power.
> The 320 W DC output is active power.
> The 500 VA AC input is complex power. To get active power you have to
> multiply it by the power factor cos( phi).
>
> More details: https://en.wikipedia.org/wiki/AC_power
> --
>
> tschC<C,
>       Jochen
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