[EMAIL PROTECTED] wrote:
Hi Jordan,
On Thu, 15 Mar 2007, Jordan Crouse wrote:
On 15/03/07 23:53 -0400, [EMAIL PROTECTED] wrote:
Hi Bert,
On Fri, 16 Mar 2007, Chris Ball wrote:
Hi Bert,
> Hi folks, what voltage does the power jack actually accept?
The current safe range is 10-19V; the input caps are rated at 25V.
You could power that from a solar cell without need for a charge
controller or external regulator. How many Amperes do the boards
require? how many Amp Hours do the batteries hold, at what voltage?
Very, very crude measurements indicate that a B1 board drew about
.625 amps full on at 12V.
Does that include display? What is the current draw when charging the
battery? I'm guessing 1.5 A or so. So approximate 18-20W of PV per board
assuming the battery is depleted when connected to the power source. Were
this installed in a school of say, 20 students, a 400W PV array could
operate the laptops during the school session, and send the children home
with fully charged batteries. One would probably want a charge controller
and battery system for such an application, as there would likely be
static local devices to power also, but for a single laptop a 15W
panel would likely do without the additional electronics, assuming my
specualtion as to draw while charging is correct.
Scott
Our battery vendor has designed a gang-charger that can be powered from
an array of PV panels, among other things.
Jordan
--
Jordan Crouse
Senior Linux Engineer
Advanced Micro Devices, Inc.
<www.amd.com/embeddedprocessors>
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