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Eircb;
If you are considering a 18w 12v panel, and a 15ah battery, I would think that your power system would be very undesized for powering the cooler. I am not sure how much research you have done with respect to selar and battery systems, but 18w for perhaps 5 hours (I would guess less in the Neatherlands) would provide very little actual power to your battery, not enough to run the coller in any case, for that long.
I would also think that you would be draining the battery 100%, which is not good for battery life.
Does this make sense?
Chris
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