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I would go with the second option. BIG switch between the output and the battery itself. If you have lawn solar panels. . .rip those out and slap them on your dash and hook them to the battery.
If you are running fans, the radio, your clock, or any other device that uses electricity your battery won't last. It also will not last for night driving and I predict its only got about 50-60 cycles of being driven for 20-30 minutes just powering the engine ECU and ignition.
You'll need solar panels or extra deep cell batteries or you're going to get stranded next week with a dead battery that can't maintain voltage enough to make the engine run, let alone turn over.
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