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Agreed the laptop will kill your battery fastest - are you using an inverter to power the 240V power adaptor that comes with your laptop, or have you shelled out for a 12V power adaptor for the plugpack. The latter will probably improve your efficiency somewhat.
If I'm off 240V I have a 100amp/hr for the laptop and 30amp/hr for the mount, etc - fortunately this doesn't happen often.
DT
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