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One of the guys I was speaking to up at Astrofest said he was powering his laptop from a 12V battery using a converter from Jaycar. It was more efficient than an inverter as it just boosted the voltage up to 15V or whatever laptops require through a DC-DC transformer.
I haven't been able to find one but it might be worth looking into if the inverter drains your batteries too quick (or if you get sick of the noise).
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