The Green Power solar water heating system is designed as a “solar assisted” water heater. This means your electric element kicks in now and again to ‘boost’ the water temperature, such as in the cold of winter and when the weather is very poor.
The system requires electricity to run the intelligent solar controller, which is the ‘brains’ behind the operation and a circulation pump. The power these use is only about 50W combined. This less than an average light bulb! The pump only operates in short bursts so electricity usage is minimal. The solar controller protects the geyser and its users by preventing the system from overheating or freezing at night in winter. The controller also maximizes the performance and output of the system.
The solar controller manages the solar heating function by measuring water temperature in the geyser and on the solar collector and acting on the temperature differential. When the water in the solar collector is a certain number of degrees hotter than the water in the geyser, the controller activates the circulation pump to move this heated water into the geyser. Once the temperature in the geyser and the solar collector are equal, the controller stops the pump and allows the solar collector to heat up again and so the process goes on...to see a more detailed explanation, point your browser here:
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