A solar-powered pump is a pump running on electricity generated by photovoltaic panels or the radiated thermal energy available from collected sunlight as opposed to grid electricity or diesel run water pumps. The operation of solar powered pumps is more economical mainly due to the lower operation and maintenance costs and has less environmental impact than pumps powered by an internal combustion engine (ICE). Solar pumps are useful where grid electricity is unavailable and alternative sources (in particular wind) do not provide sufficient energy.
A solar pump system consists of a hydraulic pump fed directly by photovoltaic solar panels, instead of being supplied by conventional electricity or diesel.
Photovoltaic pumping systems – like those powered by wind power – are very useful where it is not possible to access the general electricity network or is a prohibitive price. Their cost is generally cheaper due to their lower operation and maintenance costs, and they have a lower environmental impact than pumping systems powered by internal combustion engines, which also have lower reliability.
The pumps used can be either alternating current (AC) or direct current (DC). Normally DC motors are used for small and medium applications up to 3 kW of power, while for larger applications, AC motors are used coupled to an inverter that transforms the DC current from the photovoltaic panels for its use. This allows to dimension systems from 0.15 kW to more than 55 kW of power, which can be used to supply complex irrigation systems or water storage. In some cases a hybrid power system is installed, which can receive energy from both photovoltaic panels and a wind turbine, substantially improving the pumping.
The pumping systems are dimensioned according to the solar irradiation conditions of the place, the total dynamic height of pumping and the need for water per day. The use of batteries is not recommended, as they need maintenance and can be a point of failure. It is advisable to install a water tank that acts as a reserve for days when solar irradiation is low. For this, the installation of Australian tanks, trays or excavated tanks is common.
Currently the leading companies in solar pumping are Grundfos and Lorentz, the latter developed a novel brushless DC motor system that gives it longer life and requires fewer solar panels. There are also many Asian brands that manufacture solar pumps at a lower cost.
A photovoltaic solar powered pump system has three parts:
The solar panels make up most (up to 80%) of the systems cost. The size of the PV-system is directly dependent on the size of the pump, the amount of water that is required (m³/d) and the solar irradiance available.
The purpose of the controller is twofold. Firstly, it matches the output power that the pump receives with the input power available from the solar panels. Secondly, a controller usually provides a low voltage protection, whereby the system is switched off, if the voltage is too low or too high for the operating voltage range of the pump. This increases the lifetime of the pump thus reducing the need for maintenance. Other ancillary functions include automatically shutting down the system when water source level is low or when the storage tank is full, regulating water output pressure, blending power input between the solar panels and an alternate power source such as the grid or a petrol generator, and remotely monitoring and managing the system through an online portal offered as a cloud service by the manufacturer.
Voltage of the solar pump motors can be AC (alternating current) or DC (direct current). Direct current motors are used for small to medium applications up to about 4 kW rating, and are suitable for applications such as garden fountains, landscaping, drinking water for livestock, or small irrigation projects. Since DC systems tend to have overall higher efficiency levels than AC pumps of a similar size, the costs are reduced as smaller solar panels can be used.
Finally, if an alternating current solar pump is used, an inverter is necessary that changes the direct current from the solar panels into alternating current for the pump. The supported power range of inverters extends from 0.15 to 55 kW and can be used for larger irrigation systems. However, the panel and inverters must be sized accordingly to accommodate the inrush characteristic of an AC motor. To aid in proper sizing, leading manufacturers provide proprietary sizing software tested by third party certifying companies. The sizing software may include the projected monthly water output which varies due to seasonal change in insolation.
Solar powered water pumps can deliver drinking water as well as water for livestock or irrigation purposes. Solar water pumps may be especially useful in small scale or community based irrigation, as large scale irrigation requires large volumes of water that in turn require a large solar PV array. As the water may only be required during some parts of the year, a large PV array would provide excess energy that is not necessarily required, thus making the system inefficient.
Solar PV water pumping systems are used for irrigation and drinking water in India. The majority of the pumps are fitted with a 2000 watt – 3,700 watt motor that receives energy from a 4,800 Wp PV array. The 5hp systems can deliver about 124,000 liters of water/day from a total of 50 meters setoff head and 70 meters dynamic head. By 30 August 2016, a total of 1,20,000 solar PV water pumping systems have been installed in INDIA. in this system it produces 19M.H.W and 26 ton carbon dioxide
Oil and gas
In order to combat negative publicity related to the environmental impacts of fossil fuels, including fracking, the industry is embracing solar powered pumping systems. Many oil and gas wells require the accurate injection (metering) of various chemicals under pressure to sustain their operation and to improve extraction rates. Historically, these chemical injection pumps (CIP) have been driven by gas reciprocating motors utilizing the pressure of the well’s gas and exhausting the raw gas into the atmosphere. Solar powered electrical pumps (solar CIP) can reduce these greenhouse gas emissions. Solar arrays (photovoltaic cells) not only provide a sustainable power source for the CIPs but can also provide an electric source to run remote SCADA type diagnostics with remote control and satellite/cell communications from very remote locations to a desktop or notebook monitoring computer.
Instead of generating electricity to turn a motor, sunlight can be concentrated on the heat exchanger of a Stirling engine and used to drive a pump mechanically. This dispenses with the cost of solar panels and electric equipment. In some cases the Stirling engine may be suitable for local fabrication, eliminating the difficulty of importing equipment. One form of Stirling engine is the fluidyne engine which operates directly on the pumped fluid as a piston. Fluidyne solar pumps have been studied since 1987 At least one manufacturer has conducted tests with a Stirling solar powered pump.
Source from Wikipedia