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 - Threshin Demonstration - by Michael Delaney. Introduction I bring you greetings from Prince Edward Island, Canada. We are Canada�s smallest province but big on farming. Maybe you�ve heard of us. Potatoes are our biggest crop. However, there is lots of mixed farming here also. I have a small mixed farm with 25-30 cattle. I make very good use of old machinery. I have a 135 MF Diesel, Farmall H and 1/3 share in an Allis B. I have complete lines of tillage and harvest equipment, and a saw gear etc. I have everything one would
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