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 1800W
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
for harvesting energy.
Q: how much abuse can a kinetic energy harvester withstand? A soccer
of basketball has a lot of kinetic and impact energy bouncing around.
I'd imagine that's too much abuse though, and whatever harvesting
mechanism would break from the forces.
Would piezo work there?
Kristen
the person managing the list at
devel-ow...@lists.laptop.org
When replying, please edit your Subject line so it is more specific
than Re: Contents of Devel digest...
Today's Topics:
1. Re: harvesting energy (Chris Leonard
On Thu, Oct 27, 2011 at 2:14 PM, Tony Anderson tony_ander...@usa.netwrote:
Has anyone estimated the work required to charge an XO? Mike Lee gave a
demo some time back at the Washington D.C. Learner's Club which seemed to
show that it would be a difficult workload for an adult athlete to charge
...
Today's Topics:
1. Re: harvesting energy (Chris Leonard)
--
Message: 1
Date: Thu, 27 Oct 2011 11:51:02 -0400
From: Chris Leonardcjlhomeaddr...@gmail.com
To: Kristen Eisenbergkristen.eisenb...@yahoo.com
Cc
Due to our battery-management system, it is impossible to charge an
XO laptop in less than about 110 minutes.
Are humans better at shorter bursts of higher power? Perhaps a
human-powered charging system would benefit from some intermediary
storage, either electrical or mechanical - supercaps,
...@gmail.com
Date: Thu, 27 Oct 2011 14:29:19 -0400
Subject: Re: harvesting energy
To: tony_ander...@usa.net
CC: devel@lists.laptop.org
On Thu, Oct 27, 2011 at 2:14 PM, Tony Anderson tony_ander...@usa.net wrote:
Has anyone estimated the work required to charge an XO? Mike Lee
to materials... stuff like this can be built garage style :)
An extension of this project is harvesting energy from vanity
institutions like gyms or any teen-adult activity like sports. Gyms
and excess exercise can actually worse for the environment than
driving cars sometimes. Sounds counter-intuitive
...@gmail.com
Date: Thu, 27 Oct 2011 14:29:19 -0400
Subject: Re: harvesting energy
To: tony_ander...@usa.net
CC: devel@lists.laptop.org
On Thu, Oct 27, 2011 at 2:14 PM, Tony Anderson tony_ander...@usa.net
wrote:
Has anyone estimated the work required to charge an XO
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 rich...@laptop.org
One Laptop per Child
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for harvesting energy.
Q: how much abuse can a kinetic energy harvester withstand? A soccer
of basketball has a lot of kinetic and impact energy bouncing around.
I'd imagine that's too much abuse though, and whatever harvesting
mechanism would break from the forces.
Would piezo work there?
I think I
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