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Back when I built the panel, I had it sitting in my living room on a cloudy day and it was generating over 12V. I don't think its being filtered. I'm thinking there is perhaps some tabbing material shorting across some of the cells. I cleaned some of the excess up, but left some too thinking it probably wouldn't hurt anything. All the jostling around in the car may have moved the tabbing and is causing current to bypass some cells.
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