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I would hazard a guess that your 26ah battery running those items will probably cark it around 3am and too bad if you want a multi night endeavor away from power.
I would look at something in the 50 -100ah range, especially as you havent added in other accessory like dew etc which will inevitably come.
Thirdly, if you keep draining the battery completely flat, even a deep cycle, you will destroy it quickly.
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