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2. Solar-powered pump - Wikipedia

   en.wikipedia.org/wiki/Solar-powered_pump

   A PV solar-powered pump system has three main parts - one or more solar panels, a controller, and a pump.The solar panels make up most (up to 80%) of the system's cost. [citation needed] The size of the PV system is directly dependent on the size of the pump, the amount of water that is required, and the solar irradiance available.

3. Solar water heating - Wikipedia

   en.wikipedia.org/wiki/Solar_water_heating

   However, PV-powered active solar thermal systems typically use a 5–30 W PV panel and a small, low power diaphragm pump or centrifugal pump to circulate the water. This reduces the operational carbon and energy footprint.

4. Solar controller - Wikipedia

   en.wikipedia.org/wiki/Solar_controller

   The pump is usually switched on when the solar panel is hotter than the water in the store's heat exchanger and off when the panel is colder. Switching the pump on transfers the heat in the panel to the store. Switching it off when the panels cool prevents a reversal of the process and loss of heat from the store.

5. Solar-powered Stirling engine - Wikipedia

   en.wikipedia.org/wiki/Solar-powered_Stirling_engine

   NASA patented a type of solar-powered Stirling engine on August 3, 1976. It used solar energy to pump water from a river, lake, or stream. [1] The purpose of this apparatus is to “provide a low-cost, low-technology pump having particular utility in irrigation systems employed in underdeveloped arid regions of the earth…[using] the basic principles of the Stirling heat engine“.

6. Solar-assisted heat pump - Wikipedia

   en.wikipedia.org/wiki/Solar-assisted_heat_pump

   The operating conditions' optimization of this system is the main challenge, because there are two opposing trends of the performance of the two sub-systems: by way of example, decreasing the evaporation temperature of the working fluid increases the thermal efficiency of the solar panel but decreases the performance of the heat pump, and consequently the COP. [4]

7. Solar thermal collector - Wikipedia

   en.wikipedia.org/wiki/Solar_thermal_collector

   Solar water heating systems are most likely to be cost effective for facilities with water heating systems that are expensive to operate, or with operations such as laundries or kitchens that require large quantities of hot water. Unglazed liquid collectors are commonly used to heat water for swimming pools but can also be applied to large ...