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You'll be surprised just how much current that all draws. Are you planning to run the laptop from 12V battery? Are you wanting to use an inverter and the standard 240V plugpack, or a 12V adaptor - the former will consume more power as there are losses with each power conversion.
Dew heaters consume also more than you expect as well.
I'd suggest a 50amp/hr AGM battery (ideally 100amp/hr). Expensive and heavy, but the AGM batteries are sealed, so if you transport it to a distant site, they won't leak acid in your car. You can also discharge them further than a standard deep cycle battery. (A standard deep cycle battery shouldn't be discharged beyond 50% of its stated capacity to prevent early failure - so a 50amp/hr battery is really only a 25amp/hr. The AGM batteries can be discharged much further.)
DT
Cheers
DT
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