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I've gone the approch of modifying all my gear to handle higher voltages and running it off a 153Wh external laptop battery at 16V. I would hazard a guess that a fair amount of gear could be run off this voltage once verified.
For me its peace of mind knowing that 7-32v is fair game. And having decent reverse polarity protection.
For runtime take your gears consumption current. Times it by the supply voltage and you have rough watt hours. For me I know my battery lasts me multiple nights of astro. But cooled cameras and cranked up dew heaters would shorten that.
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