As an option, you could keep the upper grid powered element from coming on during the day using a simple electrical timer available at Home Depot or Lowes. This would help keep the upper element off and let the solar panels to do their thing in the daytime, saving even more on your pow...
A: The daily solar power you put into the tank is basically taken off your power bill. So it depends on the wattage of your panels, solar conditions in your area and your hot water usage. Typical daily power requirements of a 40 gallon tank are almost 2 KWh just to keep it at temper...
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