On 10/28/2011 10:10 PM, Hal Murray wrote:
I haven't carefully checked the accuracy of my Kill-a-Watt, but it's passed
all my sanity checks. At $20, it's a useful tool. (The technology for this
sort of thing must be reasonably solid. My new electric meter has an LCD
rather than a spinning whee
On 10/27/2011 11:45 PM, Richard A. Smith wrote:
In this specific case the question was about human power so its
reasonable to assume that the setup would use a direct DC input.
Otherwise you are losing 30% or more of your power in conversion losses.
The number I use for the DC input is 25 watt-
> Good point. Thanks. It's even worse than that. In the power mode, the
> Kill-a-Watt only shows whole watts, no fraction.
It's worse than that. IIRC mine only shows 6, 12, or 18 watts at that
low a value. Useless for really low power. I ended up using a test
board for a switching power su
rich...@laptop.org said:
> Speaking from experience measuring the power draw of a single XO with these
> low cost power meters is tricky. They can be very inaccurate at lower
> power measurements. The kill-a-watt for example has a typical accuracy of
> 1% with a max of 4%. Full scale is 1800
On 10/27/2011 11:45 PM, Richard A. Smith wrote:
Is the XO running or powered off?
Is it for a XO-1.5 or XO-1.5?
Oops. XO-1 or XO-1.5
--
Richard A. Smith
One Laptop per Child
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