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Put a 6 to 8" pvc pipe to your battery box, a straight run through the roof, paint the pipe flat black above the roof to create a draft. Place a vent on the side of the building that does not get sun at ground level and cover the vent with screen wire. This should allow a exchange of cooler air for hot air. You can cover the pvc with a chimney cap and seal the ground level vent or vent when it is cold with Styrofoam.