Note that 1,000 gallons of irrigation water costs $2.66. Last month, I used 3,600 gallons at a cost of $9.58. Even if it worked, how long would it take to break even if I bought a new solar sync sensor for $85? Also, as I understand it, the solar sync system only adjusts the percentage of the watering times set by the user. It doesn't control the actual amount of water used. So, if you set the watering time to 40 minutes per zone, the solar sync may cut it down to 30 minutes, which may still be way too much water for your lawn. User error is much more important than a solar sync adjustment.
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