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Understanding Pump Power Tracking

Pump electronics are specifically designed to run with variable output from a solar photovoltaic panel. This pump is specifically designed to work as a circulation pump for solar thermal water heater split systems. Pump can start with little sun and uses Maximum Power Point Tracking (MPPT) to run faster when there is more sun, and therefore more heat to be taken from the solar thermal panels. Eliminates the need for an electronic control system for solar energy water heaters. Electronic controllers historically cause the most trouble in a solar water heater system. Eliminate the controller with a solar PV direct pump, and the largest source of solar water heater system failures is eliminated.   Radiant floor heating also possible.

MPP tracking means that this pump will start and run when the sun is not strong enough to run other pumps, and will run faster with more sun. The most common pump application is for water circulation in a split solar thermal water heater system. Electronic controllers historically cause the most trouble in a solar water heater system. Eliminate the controller with a solar PV direct pump, and the largest source of solar water heater system failures is eliminated. The great advantage of this pump in a solar water heater system is that the solar pump runs when the sun shines, eliminating the need for an electronic controller in the system. Making the pump perfect is the ability to run efficiently with either a little sun or full sun.

This pump is built to circulate water from a solar collector on the roof to a tank that is usually in the building below. The pump needs to have a closed loop; which means water pressure in to the pump, coming from the roof, is almost the same as water pressure out of the pump going to the roof. This is a circulation water pump, built to overcome the friction of circulating water in solar water heater system.
If water circulates from the roof back down to the tank, then the pump is only overcoming friction in the pipe, not the head to the roof. The water coming from the roof has almost the same pressure as the water going back up. The pump just has to help it along, overcoming the turbulence and pipe friction losses. There has to be water in the return line and no air gaps, otherwise this little pump would not have the power to push water all the way to the roof. Once the whole line is full of water, though, then all the pump has to do is overcome friction, not gravity. This is the secret to being able to use such a small pump to circulate water to a high roof: there is no head to overcome because the system is closed loop.