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I use a large capacity deep cycle battery with a proper 12v power supply for my laptop. Invertors have another serious 'defect' in this regards apart from waveform output - they are quite wasteful of power, ie inefficient when conveting 12vDC to 240v AC - power losses often 10-25% !! Then of course with your original laptop power supply/cord you're stepping that back down to 14-19V - too many conversions for my liking.
Regardless of whether you have anything plugged into it or not the invertor is STILL using power as long as it connected to a battery too, unless it has it's own switch, which many don't. All in all that's a lot of wasted power when you're trying to get every bit you can to run your laptop, etc.
Mark I notice that you're only 12km's from me - drop me a message if you'd be interested in catching up for some observing, I can show you my battery box / laptop / solar charging setup sometime too.
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