I'm looking into a DIY project or reasonable commercial product for creating a portable power source for running my laptop at a trade-shows. Typically they charge several hundreds of dollars for supplying AC power per show, and with my basic knowledge, it should be feasible to make a battery/voltage regulator/charger system that could save me big bucks over time.
I'd want to power the device for about 10 hours.
I know that my machine typically runs on 90w AC powersupply, putting out 19vdc.
What's the best route to take? Some ideas I've seen so far:
A deep cycle 12v marine battery + car adapter.
A 3pack of 6v gel cells + dc/dc voltage regulator.
commercial battery pack with AC outlet, (about 600Ah).
Thanks in advance for your insight and advice!