Hmmm... ACCU is air-cooled condensing unit, right? So the condenser pressure will rise and can trip on high head in hot, stagnant conditions. When the wind blows, the condenser head pressure drops... The fan runs to maintain desired conditions in warm weather. If the wind is blowing, the fan can run less. Unless I've missed something conceptually, the higher the wind, the better. If assumptions are correct, just use a regular propellor fan unit. Otherwise repost if I'm off the mark.
Best wishes, -CB