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Some back-of-the-envelope calculations: 12 volts * 4 amps = 48 watts * 8 hours = 384 watt-hours. That's the minimum battery capacity you'll need to power this for a night. The Goal Zero Sherpa 50 you propose to use will power it for about an hour, give or take efficiency losses. To power the blanket for the night, you're looking for something more along ...



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