Hi Zoey,
It appears you already realize that "efficiency" is a big part of the generation design puzzle. (or problem)
Each of the items you mention, windmill, solar panels, batteries, motors, etc. have an inherent efficiency or in-efficiency. Connecting these items together in a series will compound the in-efficiency of each item for the combined system.
I expect that keeping each of these items separate will keep the in-efficiency's of each generating system to a minimum. Consider improving the propeller blade design of a windmill to use the available wind energy more efficiently or a better material to absorb and produce power from sunlight...
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