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5 laptops (say 65W, which is at the low end) for 10 hours = 5*65*10 = 3250Wh.
That's going to be heavy. A typical 50Ah car battery = 50A*12V = 600Wh. Imagine lugging at least 5 of them around.
Google: 3kva ups
A 3KVA UPS is going to start at £500. Just checking a 3KVA rackmount one by APC and it's 44.5kg.
Greenbank
@CYOA
Portable electricity. Are we there yet? I'd like something I can power a few small-mid size rack mounted devices from that I could pop in the bottom of a flight case and where around. Would need to lift it so wouldn't want it too heavy. Similarly I don't want to spend 10 grand on it. Would need enough juice to power the equivalent of say 5 laptops from a wall outlet running up to 10 hours. Less visible but 10 = nice. Basically like one of those battery pack things for phones but with considerably more oomph.