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After being disappointed by a 1W panel that had a defective diode 6 yrs ago (used to avoid a reverse current flow)...I'm having good luck with a 5W panel ($35) bought thru Amazon.
Does not need a controller....does not overcharge the battery....but puts out enough current to build the battery back up after using a 12V air compressor to refill an air tank.
The seldom driven vehicle is also sitting in partial shade....panel is under the windshield.
Keeps me from needing to put a charger on the battery every 2 weeks or so.
Why buy thru Amazon? Mostly the reviews...4*s and many reviews means a product has been around a while and it works. If you can find a better price with free shipping...go for it?
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Carry on humans...we are extremely proud of you. .................. 
Forty-six percent of Americans believe in the creationist view that God created humans in their present form at one time within the last 10,000 years. GALLUP POLL 
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