Stephan,
 I suggest you look at this site for information http://www.powerstream.com/dc12-48.htm<http://www.powerstream.com/dc12-48htm>
You will need a regulated d.c. to d.c. adaptor or supply, fixed or variable, capable of supplying wattage required for your laptop/s. with a little ingenuity you can easily modify an automobile connector type to connect to your battery bank.
HTH,
Hal Seabolt
  ----- Original Message ----- 
  From: Stephan Prince<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Thursday, January 26, 2006 6:22 PM
  Subject: [PCBUILD] Laptop/Notebook power


  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 

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