Interesting idea. I'd like to see you have success with it!
I personally am going to delete my alternator belt, but keep it with me in case it's ever needed for a long evening trip or maybe in winter when not much sunlight. Most of my commutes are between 6 and 20 miles... so I would not have much drain on my battery. Using a flexible 100W solar panel on my roof should easily top it off most days. I already have LED running lights and will replace my headlights soon. My old school car doesn't have much current draw while running. In fact, I almost always roll start my car. I'll be running some tests without the belt soon just to see how much drain it does on the battery before I invest in the solar panel and controller. I will likely go to a marine battery with more capacity as well, although I honestly don't think I'll need to based on calculations of the draw that my car has while running not using the lights. Night-time driving may warrant the Marine battery.
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