Alternate Power Supplies

[Mitch Bradley]

scott at gnuveau.net wrote:
> Hi Jordan,
>
> On Thu, 15 Mar 2007, Jordan Crouse wrote:
>
>   
>> On 15/03/07 23:53 -0400, scott at gnuveau.net 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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