Re: [BULK] Re: harvesting energy

2011-10-28 Thread Hal Murray
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

Re: [BULK] Re: harvesting energy

2011-10-28 Thread DJ Delorie
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

Re: [BULK] Re: harvesting energy

2011-10-27 Thread Richard A. Smith
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 ___ Devel mailing list Devel@lists.laptop.org