The Solar Tubewell pump has a smaller than expected vitality house in its heart and comprises of an aligned sunlight based exhibit and coordinating of units – tuned with the equal direct power for this specific application. The solar tube well framework is equipped for running a wide range of electric water pumps with applications change from water system to home requests. Water system pumps, for example, the submersible, profound or profound well can be joined with trickle water system frameworks to upgrade the profits from this recovery
The sun is a powerful source of renewable Solar energy for our planet energy requirments. The sun is the most reliable Solar energy resource among the available renewable energy sources. Water is most important for all kinds of life on earth. Who Needs water most?? Its humans, corps , livestock, crops and the environment. We always needed energy to lift water from where it is available, (i.e. source) to where it is required (i.e. the place of use).
Generally, solar tubewell pumps are used to relocate water from the water sources which may be underground or from surface water bodies like ponds, lakes, canal, rivers, steams, etc. to its ultimate consumption points which may be a herd, cropped field or domestic overhead tank. These pumps however, require energy/power which can be expensive and unreliable. Solar energy can be used to pump water and these solar-powered pumping systems are particularly ideal for remote locations.
However, economics of solar-powered pumping systems can only be justified, if it is properly designed and linked with high- efficiency irrigation systems such as drip, bubbler, sprinkler or bed and furrow irrigation methods. Pakistan primarily has an agro-based economy and performance of agricultural sector along with other factors is also affected by continuous supply of energy at affordable costs. Unfortunately, Pakistan has been seriously struggling with conventional energy sources since 2005. Consequently, all sectors of economy including agriculture are performing sub optimally. Agriculture sector is also affected as almost 60% of crop water requirements in the irrigated areas and almost entire irrigation requirements within rainfed areas are dependent on pumping. However, the negative impacts of present energy crises can be minimized, if solar energy potential of Pakistan is harnessed. It has been estimated that averagely about 3000 sunny hours are available in Pakistan during each year, which can produce 5-7 kWh/m of solar energy. By exploiting available solar energy particularly, in agriculture sector not only agricultural productivity can be increased but it can also help improve the environment. International Center for Agricultural Research in the Dry Areas (ICARDA) and the United States Department of Agriculture (USDA) through its partner institutions have demonstrated solar-powered irrigation system at Fatehjang, Chakwal, Faisalabad and Karachi on pilot scales. These solar-pumping systems have been designed to potentially utilize the pumped water through different high efficiency irrigation systems (HEIS) for development of high-value agriculture. This pilot scale demonstrations have gained widespread appreciation within Pakistan. Being convinced from the pilot
demonstration, different developmental agencies, progressive farmers and NGOs have started adopting solar-powered irrigation
systems. However, due to lack of information particularly about solar system design aspects, the typical up scaling of these systems is generally becoming expensive. This report has been prepared to facilitate the professionals and the Agricultural Service Providers (ASPs) by: firstly describing the potential benefits of solar-powered irrigation systems and secondly providing detailed design procedures in a simple and stepwise manner. Simple examples have been provided to further better understand the system.
Moreover, the report also includes general troubleshooting and its remedial measures.
2. Potential Benefits of Solar-Powered Irrigation Systems
Solar-powered irrigation systems have the following major
advantages: ??Operational cost is minimal in case of direct use
Easy to operate and maintain as compared to conventionally ?fueled pumping systems
Flexibility of direct coupling or through batteries for irrigation ?purposes ?Daily 5-10 hours of uninterrupted pumping operation is possible
Suitable for remote watershed and rainfed areas
??Long working life
Can be successfully integrated with different drip, bubbler, ?micro sprinklers and rain guns
Potential for multiple uses at farm (irrigation and farm
electrification are possible through intelligent circuiting from the ?same investment of PV Panels)
It helps stabilize the climate due to no emissions of green house ?gases during irrigation process
Weather responsive pumping system (more flows during
summer when water needs are also high and vice versa for ?winter periods)
Availability of pumping systems for wide range to suit different ?farm sizes and socio-economic conditions
Small payback periods, particularly if high-value crops are
3. Components of a Typical Solar-Powered Pumping System
Before describing the step-wise procedure for solar-pumping system
design, it may be beneficial to orient the reader about the basic
components of solar-pumping system. A typical solar-powered
pumping system will essentially comprise the following components
Each sun based exhibit has various sun oriented modules associated in parallel or arrangement. Each sun oriented PV board creates current by changing over sun based radiation to electrical vitality.
The electrical energy of the whole lattice is controlled, tuned and coordinated by an inbuilt controller in DC pumps or through factor recurrence driver (FD) and empowers the pump associated (might be submersible or surface) to draw water and nourish conveyance tubes.
Water extricated from lakes, waterways, wells or different sources is pumped by a sunlight based water pump to give water as required. The tanks can be put away as far as where they are later steered to the fields or the supply of the pump can be joined with dribble water system frameworks to give ideal water to the fields specifically.
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How Much Approximate solar tube well Pump can deliver Water ????
One HP Pumpset gives a discharge of about 2200 gallons per hour. Discharge rates according to the size of pumpsets:
- 1 HP : 2000 – 3000 gph
- 1.5 HP : 3000 – 4000 gph
- 2 HP : 5000 – 6000 gph
- 3 HP : 6000 – 7000 gph
- 5 HP : 1000 – 12000 gph.
Which type of motor A/C or D/C is best for solar water pumping system?
There are several different types of solar-powered pumps depending on how they have been classified. But primarily there are four types of solar water pumps–submersible pumps and surface pumps, direct current (DC) pumps and alternate current (AC) pumps.
Submersible pumps: As the name suggests, a submersible pump is located deep below the ground level and remains submerged under water. The suction head of the submersible pump is beyond a depth of 10 metres. The installation of these pumps is done by digging a borewell, which leads to an increase in its installation and maintenance cost.
Surface pumps: The surface pumps remains out of water and in the open. They are installed where the water table is within a depth of 10 metres. As they need to be on the surface, these pumps are easier to install and maintain. They are, however, not apt for deep water table.
DC pump: This pump runs on a motor which operates on direct current, therefore no battery or inverter is needed in this type of pump.
AC pump: The motor of this pump operates on alternating current, which means the direct current produced by the solar panels gets converted to AC using the inverter. The conversion from DC to AC leads to loss of power from generation and consumption.
The selection is based on the groundwater level and the water source. In the case of a borewell with a water table deeper than 10-15 metres, a submersible pump is used. If it is an open well, pond, etc, then using a surface pump is better. Also, the surface pump is installed when the water level is less than 10 metres.
Based on the classification, the following types of motor pump sets are available:
- Surface mounted motor pump set
- Submersible motor pump set
- Floating motor pump set
- Any other type of motor pump set after approval from test centres of the Ministry of New and Renewable Energy.
- Although DC pumps have an advantage over AC pumps in terms of higher efficiency and no requirement of an inverter for operation, the cost of DC pumps is higher. Also, the repair and maintenance of DC pumps are difficult in rural and remote areas due to lack of service centres in these areas.
What is the approximate cost of installing a solar tube well pump for agricultural purposes in Pakistan?
The Cost of a solar Tubewell Pump depends on the following factors:
A). The depth of the water (Called Head) B).The discharge of water desired per day. C). Delivery Size (Delivery Pipe)
These three factors will determine the No of HPs of the Pump required, to fulfil the aspirations of the farmer. Thereafter will be the Type of pump required (Submersible / Surface) and the KWp of solar panels required to give the desired energy to the Solar pump Inverter. It is my strong recommendation that AC Pumps be used, since it is nearly impossible to maintain and repair a DC pump in the field.
However, to give an approximate cost, it will be approx 1.25 Lakhs per HP, with requisite warranties and repair cover.