I'm a bit skeptical of a solar panel's ability to charge batteries well enough to be useful. I suppose if the cart is sitting in the sun for long periods of time maybe every little bit helps. But even the best performing solar panels out there today are only 35% efficient. And with the limited surface area to place them on one's cart combined with the flat angle, I'm just not sure about the cost benefit. I would have to do some of my own testing to buy into this.
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