I just had a meeting with our local rep from Hunter Irrigation. We use Hunter Controllers frequently on our projects. They have just launched a new smart controller module, Solar Sync, which adjusts programing for solar exposure, temperature, and rainfall. The multifunction sensor has a sensor for sunlight, can detect freezing temperatures, and turn the controller off in case of rain.
Unlike Hunter’s fancier ET system, the Solar Sync is cost effective and easy to program, with a simple module that adjusts the percent application of irrigation. Just program the controller for what normal watering would be during the hottest month of the year, make a few minor adjustments and the Solar Sync does the rest. Say it is 50 degrees on average during the month March, Solar Sync may only apply 10-20% of the normal maximum watering. The module recalculates the percent application each night, ensuring that plants are watered appropriately.