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A guy at work used to have one at work that was 20w that plugged into his cig lighter. Seemed like a neat idea. Keeps old batteries useful for quite a bit longer. Past that thats about it. No roi or payoff on solar panels on cars besides extending 12v battery life.
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"I feel like the bad decisions come into play when you trade too much of your time for money paying for things you can't really afford."
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