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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don�t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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