I would like to build a simple homemade gravity battery (a weight is pulled to a high height and is then dropped to turn a motor and generate electricity.) My plan is to have a 5kg weight pulled to 2 meters, testing this example and then increasing the weight to 10kg and height to 4 meters.
I was originally thinking of using a gearbox of some sort, in order to reduce the height required to drop the weight, and increasing the RPM at which the motor-generator rotates (due to many motors I’ve found needing between 100-2000 rpm.) After reading a related post on this site about using pulleys to lift a weight, though, it has made me consider whether pulleys would be a better fit.
TL;DR - Would using pulleys, a gearbox, or a combination of the two be beneficial in decreasing the rope used when lifting/lowering a weight and increasing the RPM of the motor-generator?