Actually DC to AC may be more effective than Dc to Dc conversion.
I'm quite sure that laptops require quite good DC and conversion
is made usually changing DC to AC and then converting back to DC.

Most effective way is to have laptops what all require 12V DC. If there
is more computers then I think most effective (taking account how easy
it would be use and how much it costs) is DC to 120V AC conversion.

Toomas





----- Original Message ----- 
From: "Paul Hachmeyer" <[log in to unmask]>


> You need to be certain of the power needs of the laptops - some laptops have 
> reduced voltage AC supplied thru the power supplies and some get DC, others 
> simply plug into 120 v and convert it internally.  As inefficient as it 
> might be to plug them into an AC inverter, that should work for all the 
> laptops.
>
> Stephan Prince wrote:
>
>> We are trying to implement a Point of Sale system for retail sales at 
>> remote location. There is no A/C power to speak of, but a generator that 
>> charges a bank of deep charge, gel 12volt batteries. We want to run a 
>> couple of notebooks or laptops for sales directly of the bank of batteries 
>> rather than invert the D/C to A/C. This loses so much in the invertion 
>> process that it is inefficient. I know you can run laptops off external 
>> powersources, but how can I regulate the power off the bank of deep cells 
>> to match these laptops?
>> Thanks for all your help,
>>
>> Stephan Do you want to signoff PCBUILD or just change to
>>                     Digest mode - visit our web site:
>>                    http://freepctech.com/pcbuild.shtml
>
>              The NOSPIN Group is now offering Free PC Tech
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