For a small battery, a panel rated at 5 watts can just barely do the job a moderate sun area. If a dark gloomy area - like many places on the east and west coast - you need more.
Here in New York, I use several - and a 15 watt panel works well, all winter, with no controller.
As you probably aleady know, Volkswagen was giving them away (with new cars) and they plugged into the cigarette lighter. They sell outright for around $50 for a 2 watt model, and $100 for a 6 watt. The larger 6 watt is needed unless you live in a very bright area.
Small panels are very expensive with the price per watt and - they are also not as good quality as larger panels. I can buy 120 watt panels at $3 per watt. The small panels often cost $15 - $20 per watt.
You also need a way to charge a 6 volt battery, and you won't find many 6 volt panels.
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Today's Featured Article - A Lifetime of Farm Machinery - by Joe Michaels. I am a mechanical engineer by profession, specializing in powerplant work. I worked as a machinist and engine erector, with time spent overseas. I have always had a love for machinery, and an appreciation for farming and farm machinery. I was born and raised in Brooklyn, New York. Not a place one would associate with farms or farm machinery. I credit my parents for instilling a lot of good values, a respect for learning, a knowledge of various skills and a little knowledge of farming in me, amo
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