While I like the idea for its steampunk appeal, looking at potential/kinetic energy delta, you have two ways really: build overcapacity for solar, immovable, uses rare earth minerals, but other than dust, maintenance free and then that capacity will sit idle at night or you build capacity like these lifts at that capacity is going to sit unusued during the day, but it does require a lot more maintenance due to moving parts and potentially more resource heavy to build, but no exotic materials. I think the best way forward is to, of course use the least amount of energy possible - insulate from both heat and cold, make efficient CPUs and run everything you can in software and anything physical make it run during the day on solar. Once environmental costs are accounted for, it makes no sense to run things like cars and shops and washing machines at night.