Yeah the mount won't draw much once its on target, it probably pulls 2 amps when slewing at high rate (based on NEQ6). The problem will be the laptop and any dew heaters you need to run. To reduce power required consider getting a small netbook type pc. I use a netbook, and it draws very little. I use it to run my guide app (Metaguide) and that's all as I use a DSLR camera and don't need a bigger pc for image capture. The bigger the computer the more power it will need and usually via an inverter in the field unless you have a generator.
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