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 
> 
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