It is an electronic device that controls the circulating pump in a solar hot water system to harvest as much heat as possible from the solar panels and protect the system from overheating. The basic job of the controller is to turn the circulating pump on when there is heat available in the panels, moving the working fluid through the panels to the heat exchange at the thermal store. Heat is available whenever the temperature of the solar panel is greater than the temperature of the water in the heat exchange. Overheat protection is achieved by turning the pump off when the store reaches its maximum temperature and sometimes cooling the store by turning the pump on when the store is hotter than the panels.
The solar ac drive VFD come up the variety of feature as below.
Special functions for solar water pumping: To give optimal performance for solar water pumping, Solar AC DRIVE VFD should offer special features for solar water pumps. In-built MPPT tracking algorithm without any need of external card in cabinet. Constant voltage mode (CVT) selection. The function of dormant state at weak light and automatic wake up at strong light. Adjustable delay time for weak light and wake up function. Level control function of high water level dormant state. Under-load pre-warning and protection functions to ensure normal operation of water pumps under changing operating conditions. Facility of connecting grid as well as dc input with pre-programmed changeover between them. RS485 communication facility. Optional panel accessory of data logging through GPRS block.
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