I have an Alternator field disconnect switch. This way I can see how long I can go without running the alternator. I have a 15Watt panel on the dash board. For a few weeks this summer I was able to go without turning on the alternator. But my truck sits at the airport 4 days a week, drive home, run to home depot once or twice a weekend, drive back to the airport Monday. So sitting in the sun all the time and only putting 50 miles a week on the truck I was able to just get by during the summer. A deep cycle battery would help since I could have more usuable energy from sitting in the sun for 4 days straight.
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