If you've seen breaking bad you probably already know what I'm asking. in this episode I'm watching, they are hand cranking the generator to recharge the battery. They are moving nowheres near as fast as the motor would have spun it. My dad had a hand crank device that was, more or less, a toy. so I'm sure they were producing some electricity. is this artistic license, or is recharging the rv battery enough to start it, by hand cranking the generator, a realistic ambition? How much voltage, wattage, amperage, or whatever could they expect to produce and how long would it take to get that battery charged enough. just in general. Assuming spherical cows making whatever assumptions you need to make (consistent turning and so forth). How would this be calculated?