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Chris, might be an idea to insulate the shed and provide some airflow with small 12volt computer fans. Insulation will minimise the heat buildup and some airflow through the shed will keep the temps down. The solar panel idea is OK and you should be able to drive the fans directly without a battery, that way if the sun's shining the air is circulating and there should be no need for a thermostat. Another technique I've seen on hothouses is to raise the roof a little as the temperature rises to allow airflow by convection.
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