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Old 03-10-2018, 12:00 AM   #13 (permalink)
Stubby79
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You need as much reserve capacity(amp-hours) as you can get your hands on and/or to reduce the draw (amps) from said battery, as you are already suggesting with LEDs. Plus it would be good that the battery be designed to put up with deep discharges. Pick whatever you want, though an AGM or deep cycle flooded will be cheapest and easiest. And also the most heavy.

Then you probably want to consider a means of putting back the amp-hours taken from it each day. Plug it in, or find some kind of portable power supply that you can charge inside and use to recharge the battery through your cigarette lighter. It will need to have the current limited to 10a or so, and have a higher voltage than your battery. Without over-charging it. Or you need to rig up your alternator to do it's job now and then. If it isn't already.
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