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its a simple formula really... on your battery packs for the laptops look at the box that is always inline, it will tell you a input and output for the computer.
the output is MAX OUTPUT that means that the laptop will never go above that if it does it would fry it (and that just wouldn't happen).
the EQ6 is max 2amp draw. I know from experience that the EQ6 and Eeepc of mine draws about 1.2 amp when taking images. so if i wanted to keep the Deep cycle battery above 40 percent, then its a easy conversion
2 nights at 10 hours a night (for setup and running times) my eeepc draws max of 2 amps, my eq6 draws a max of 2 amps so that is 4 amps max. 4 times 20 equals 80 amps. then its a conversion of 0.4*battery size + 80a-h = battery size.
that is the 40%+running costs in amps per hour = the size of the battery. try a few numbers and you will get the answer.
in all realistic terms though you wouldn't need this amount of power because there is no way you would be using 4 amps per hour not even if you tried.! more like 1.5amps per hour...
A small word of warning though if you are using PWM dew heaters be sure to run 2 separate batteries. some mounts don't like the power fluctuations!
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