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You would probably want a panel rating of 2x the current drain of your scope setup. My scope running dew heaters flat out and argo navis uses about 2A.
A 30W module at $344 gives 30/12= 2.5A. A 40W module is $415.
Probably cheaper just to bring along enough battery power to last your trip if its just for a star party lasting a few days.
I have a box containing 2x17Ah gel cells which gives me an estimated 17hours usage for under $100.
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