This document summarizes solar photovoltaic water pumping systems. It describes the key components of solar PV pumping systems including the solar panels, motor, pump, and controller. It discusses common pump types like submersible pumps. It also outlines applications for village water supply, livestock watering, and irrigation. It provides guidance on properly sizing a solar PV pumping system to match the water demand and supply.
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This project proposes a new low cost converter- inverter drive system for induction motor.
The converter is designed to drive a three-phase induction motor directly from PhotoVoltaic (PV)
energy source. The three phase induction motor is better because of its low cost, reliability, no
maintenance, high efficiency and good power factor. Two Inductor Boost Converter (TIBC) is used
in first stage along with the voltage doubler rectifier and snubber to develop the system. The reason
to choose TIBC is due to its high voltage gain and low input current ripple, which minimizes the
oscillations at the module operation point. To convert the boosted DC output voltage from PV
module into AC, a voltage source inverter is implemented to attain sufficient voltage to drive the
motor. As the PV cell posses the nonlinear behaviour, the Maximum Power Point Tracker (MPPT)
controller is needed to improve the utilization efficiency of the converter. The MPPT algorithm
proposed in this paper based on hill climbing algorithm, for matching the load and to boost the PV
module output voltage. PI Controller is used to control the speed of the Induction Motor. The entire
system is simulated using Matlab Simulink environment. The system is expected to be operated with
high efficiency and low cost for long lifetime.
SI20 series is an environmental-friendly and energy-efficient inverter on the international solar water pump inverter market. It can drive both synchronous and asynchronous three-phase AC induction motor pumps. With advanced MPPT and CVT technology, the solar pumping system can track the maximum power of solar panels in real time. More Detail: https://www.veichi.org/product/solar-water-pump-inverter/si20-synchronous-photovoltaic-pump-inverter.html
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Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
SIMULATION AND ANALYSIS OF TIBC FOR INDUCTION MOTOR DRIVEEditor IJMTER
This project proposes a new low cost converter- inverter drive system for induction motor.
The converter is designed to drive a three-phase induction motor directly from PhotoVoltaic (PV)
energy source. The three phase induction motor is better because of its low cost, reliability, no
maintenance, high efficiency and good power factor. Two Inductor Boost Converter (TIBC) is used
in first stage along with the voltage doubler rectifier and snubber to develop the system. The reason
to choose TIBC is due to its high voltage gain and low input current ripple, which minimizes the
oscillations at the module operation point. To convert the boosted DC output voltage from PV
module into AC, a voltage source inverter is implemented to attain sufficient voltage to drive the
motor. As the PV cell posses the nonlinear behaviour, the Maximum Power Point Tracker (MPPT)
controller is needed to improve the utilization efficiency of the converter. The MPPT algorithm
proposed in this paper based on hill climbing algorithm, for matching the load and to boost the PV
module output voltage. PI Controller is used to control the speed of the Induction Motor. The entire
system is simulated using Matlab Simulink environment. The system is expected to be operated with
high efficiency and low cost for long lifetime.
SI20 series is an environmental-friendly and energy-efficient inverter on the international solar water pump inverter market. It can drive both synchronous and asynchronous three-phase AC induction motor pumps. With advanced MPPT and CVT technology, the solar pumping system can track the maximum power of solar panels in real time. More Detail: https://www.veichi.org/product/solar-water-pump-inverter/si20-synchronous-photovoltaic-pump-inverter.html
Solar-powered irrigation system is an application of solar-powered water pumping system used in paddy fields, gardens for watering the plants, vegetables, etc.
Design and development of pico micro hydro system by using house hold water s...eSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Saudi Arabia stands as a titan in the global energy landscape, renowned for its abundant oil and gas resources. It's the largest exporter of petroleum and holds some of the world's most significant reserves. Let's delve into the top 10 oil and gas projects shaping Saudi Arabia's energy future in 2024.
Understanding Inductive Bias in Machine LearningSUTEJAS
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Student information management system project report ii.pdfKamal Acharya
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Water billing management system project report.pdfKamal Acharya
Our project entitled “Water Billing Management System” aims is to generate Water bill with all the charges and penalty. Manual system that is employed is extremely laborious and quite inadequate. It only makes the process more difficult and hard.
The aim of our project is to develop a system that is meant to partially computerize the work performed in the Water Board like generating monthly Water bill, record of consuming unit of water, store record of the customer and previous unpaid record.
We used HTML/PHP as front end and MYSQL as back end for developing our project. HTML is primarily a visual design environment. We can create a android application by designing the form and that make up the user interface. Adding android application code to the form and the objects such as buttons and text boxes on them and adding any required support code in additional modular.
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Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Immunizing Image Classifiers Against Localized Adversary Attacksgerogepatton
This paper addresses the vulnerability of deep learning models, particularly convolutional neural networks
(CNN)s, to adversarial attacks and presents a proactive training technique designed to counter them. We
introduce a novel volumization algorithm, which transforms 2D images into 3D volumetric representations.
When combined with 3D convolution and deep curriculum learning optimization (CLO), itsignificantly improves
the immunity of models against localized universal attacks by up to 40%. We evaluate our proposed approach
using contemporary CNN architectures and the modified Canadian Institute for Advanced Research (CIFAR-10
and CIFAR-100) and ImageNet Large Scale Visual Recognition Challenge (ILSVRC12) datasets, showcasing
accuracy improvements over previous techniques. The results indicate that the combination of the volumetric
input and curriculum learning holds significant promise for mitigating adversarial attacks without necessitating
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NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...ssuser7dcef0
Power plants release a large amount of water vapor into the
atmosphere through the stack. The flue gas can be a potential
source for obtaining much needed cooling water for a power
plant. If a power plant could recover and reuse a portion of this
moisture, it could reduce its total cooling water intake
requirement. One of the most practical way to recover water
from flue gas is to use a condensing heat exchanger. The power
plant could also recover latent heat due to condensation as well
as sensible heat due to lowering the flue gas exit temperature.
Additionally, harmful acids released from the stack can be
reduced in a condensing heat exchanger by acid condensation. reduced in a condensing heat exchanger by acid condensation.
Condensation of vapors in flue gas is a complicated
phenomenon since heat and mass transfer of water vapor and
various acids simultaneously occur in the presence of noncondensable
gases such as nitrogen and oxygen. Design of a
condenser depends on the knowledge and understanding of the
heat and mass transfer processes. A computer program for
numerical simulations of water (H2O) and sulfuric acid (H2SO4)
condensation in a flue gas condensing heat exchanger was
developed using MATLAB. Governing equations based on
mass and energy balances for the system were derived to
predict variables such as flue gas exit temperature, cooling
water outlet temperature, mole fraction and condensation rates
of water and sulfuric acid vapors. The equations were solved
using an iterative solution technique with calculations of heat
and mass transfer coefficients and physical properties.
NUMERICAL SIMULATIONS OF HEAT AND MASS TRANSFER IN CONDENSING HEAT EXCHANGERS...
Solar Photovoltaic Waterpumping.pdf
1. Practical Action, The Schumacher Centre for Technology and Development, Bourton on Dunsmore, Rugby,
Warwickshire, CV23 9QZ, UK
T +44 (0)1926 634400 | F +44 (0)1926 634401 | E infoserv@practicalaction.org.uk | W www.practicalaction.org
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Company Reg. No. 871954, England | Reg. Charity No.247257 | VAT No. 880 9924 76 |
Patron HRH The Prince of Wales, KG, KT, GCB
SOLAR (PHOTOVOLTAIC)
WATER PUMPING
Introduction
Water pumping has a long history; so many methods have been developed to pump water.
People have used a variety of power sources, namely human energy, animal power, hydro
power, wind, solar and fuels such a diesel for small generators. The most common pumps
used in remote communities are:
• Hand pumps
• Direct drive diesel driven borehole pumps
• Electric submersible pumps with diesel generator
• Solar submersible pumps
The relative merits of the various pumping methods are laid out in Table 1 below.
Advantages Disadvantages
Hand pumps
Link
• local manufacture is possible
• easy to maintain
• low capital cost
• no fuel costs
• loss of human productivity
• often an inefficient use of boreholes
• low flow rates
Animal driven
pumps
• more powerful than humans
• lower wages than human
power
• dung may be used for
cooking fuel
• animals require feeding all year round
• often diverted to other activities at
crucial irrigation periods
Hydraulic pumps
(e.g. rams)
Link
• unattended operation
• no fuel costs
• easy to maintain
• low cost
• long life
• high reliability
• require specific site conditions
• low output
Wind pumps
Link
• unattended operation
• easy maintenance
• long life
• suited to local manufacture
• no fuel requirements
• water storage is required for low wind
periods
• high system design and project
planning needs
• not easy to install
Solar PV • unattended operation
• no fuel costs
• low maintenance
• easy installation
• long life (20 year)
• high capital costs
• water storage is required for cloudy
periods
• repairs often require skilled
technicians
Diesel and
gasoline pumps
• quick and easy to install
• low capital costs
• widely used
• can be portable
• fuel supplies erratic and expensive
• high maintenance costs
• short life expectancy
• noise and fume pollution
Table 1: Comparison of pumping techniques
2. Solar (PV) water pumping Practical Action
2
Applications
Solar pumps are used principally for three applications:
• village water supply
• livestock watering
• irrigation
A solar pump for village water supply is shown schematically in Figure 1. The Village will have
a constant water demand although there is need to store water for periods of low insolation
(low solar radiation). In environments where rainy seasons occur some of this demand can be
met by rainwater harvesting during the rainy season.
Ideally in Sahelian Africa the storage would be 3-5 days of water demand. In practice some
installed tanks do not have sufficient capacity and are smaller than a days demand leaving the
tank empty at the end of the day. This is due to a mismatch between the sizing, pump
capacity and the demand profile during the day.
The main applications for solar water pumping are for livestock watering in the USA and
Australia. In Africa the systems are used for village water systems and livestock watering.
While applications of solar water pumping for irrigation are on the increase especially in India
and China.
A solar irrigation system (Figure 2) needs to take account of the fact that demand for irrigation
water will vary throughout the year. Peak demand during the irrigation seasons is often more
than twice the average demand. This means that solar pumps for irrigation can be under-
utilised for most of the year although there can be a reduction in strength of the sun during
these times reducing supply side of the equation.
Attention should be paid to the system of water distribution and application to the crops. The
Figure 1: Village water supply
3. Solar (PV) water pumping Practical Action
3
system should minimise water losses, without imposing significant additional head on the
pumping system and be of low cost.
The suitability of major irrigation systems for use with solar pumps is shown in Table 2.
Distribution method Typical application
efficiency
Typical head Suitability for use
With solar pumps
Open Channels 50-60% 0.5-1m Yes
Sprinkler 70% 10-20m No
Trickle/drip 85% 1-2m Yes
Flood 40-50% 0.5m No
Table 2: Suitability of major irrigation methods for use with solar pumps
The technology
Photovoltaic pumps are made up of a number of components. There is a photovoltaic array
which converts solar energy directly into electricity as DC. The pump will have an electric
motor to drive it.. The characteristics of these components need to be matched to get the best
performance. The pump motor unit will have its own optimum speed and load depending on
the type and size of the pump.
Motor
This can be DC or AC. If an AC motor is used then an inverter is also needed. AC motors are
more widely available.
Inverters have become cheap and efficient and solar pumping systems use special
electronically controlled variable-frequency inverters which will optimise matching between
the panel and the pump. A typical AC system would also need batteries which require
maintenance and add to the cost as the system is less efficient and would need a larger array.
Figure 2: Solar irrigation system
4. Solar (PV) water pumping Practical Action
4
The most efficient type of DC motor is a permanent magnet motor. CD motors may have
carbon brushes which replacing when they wear out, If a brushed dc motor is used then the
equipment will need to be pulled up from the well (approximately every 2 years) to replace
brushes.
Brushless designs of CD motors exist where electrical circuits are used instead of
commentators and brushes. These are becoming popular in solar pumping systems.
Brushless dc motors would require electronic commutation.
Solar Panels
The basic principles of solar photovoltaic panels are explained in the Practical Action
Technical Brief Solar Photovoltaic Energy
Some models use a GPS sensor to provide latitude, longitude and time data to enable the
controller to calculate the position of the sun and position the solar array.
The Pump
Pump options and the system configuration are described below
Submersible Pumps
Often with electronic load controllers. The pump will be submerged while the load controller is
above ground.
The advantages of this configuration are
that it is easy to install, often with lay-
flat flexible pipework and the motor
pumpset is submerged away from
potential damage.
Multistage centrifugal pumps
The centrifugal pump will start at low
torque and can be matched with the
solar array without electronic controllers.
The pumps are not as a efficient as
positive displacement pumps using
cheap electronic load controllers.
Suitable for smaller heads. Older type
set with AC motors operate at heads of
10-25m.
Positive displacement helical pumps
Helical pumps have the best efficiency
and the smallest PV panel for the same
specs of water delivery volume pressure
and head. They have low rotational speed. The pump is made up a metal helical rotor which
rotates in a rubber casing. Suitable for bigger heads.
A Mono solar pump will slow down when it is cloudy, but because it has no minimum speed
(unlike a centrifugal pump) it will keep delivering water.
Figure 3: Submerged multistage centrifugal motor
pumpset
5. Solar (PV) water pumping Practical Action
5
Submerged pump with surface mounted
motor
The main advantage is the easy access to the
motor for maintenance.
The low efficiency from power losses in the shaft
bearings and the high cost of installation has
been disadvantages. In general this
configuration is largely being replaced by the
submersible motor and pumpset.
Floating motor pump sets
The versatility of the floating unit set, makes it
ideal for irrigation pumping for canals and open
wells. The pumpset is easily portable and there is
a negligible chance of the pump running dry.
Most of these types use a single stage submersed
centrifugal pump. The most common type has a
brushless dc motor. Often the solar array support
incorporates a handle or 'wheel barrow' type
trolley to enable transportation.
Surface suction pumpsets
This type of pumpset is also suitable
for low head applications. It is not
recommended except where an operator
will always be in attendance for
maintenance and security of exposed
systems.
Although the use of primary chambers and non-return valves can prevent loss of prime, in
practice self-start and priming problems are experienced. It is impossible to have suction
heads of more than 8 metres.
Less common types of solar powered pumps include solar PV powered reciprocating piston
(nodding donkey) pumps and solar thermal pumps or thermosyphones pumps exits but are not
Figure 4: Submerged pump with surface
mounted motor
Figure 5: Floating motor pump
Figure 6: Suction pumpsets
6. Solar (PV) water pumping Practical Action
6
commercially used.
Performance
Solar pumps are available to pump from anywhere in the range of up to 200m head and with
outputs of up to 250m³/day.
Solar pumping technology continues to improve. In the early 1980s the typical solar energy to
hydraulic (pumped water) energy efficiency was around 2% with the photovoltaic array being
6-8% efficient and the motor pumpset typically 25% efficient. Today, an efficient solar pump
might have an average daily solar energy to hydraulic efficiency of more than 9% but lower
efficiencies of 2 -3% are still common.
It is important to get the most efficient pump available as the difference in cost between the
poor pump and a very efficient pump is much less that the additional cost required for a larger
PV panel. Accurate sizing of the array is important in keeping costs down.
A good sub-system (that is the motor, pump and any power conditioning) should have an
electrical to hydraulic efficiency of around 70% using positive displacement pumps. With
diaphragm pumps the efficiency will be around 45% and centrifugal pumps might have an
efficiency of 20%.
Procurement
Assessing requirements
The output of a solar pumping system is very dependent on good system design derived from
accurate site and demand data. It is therefore essential that accurate assumptions are made
regarding water demand/pattern of use and water availability including well yield and expected
drawdown.
Domestic water use per capita tends to vary greatly depending on availability. The long-term
aim is to provide people with water in sufficient quantities to meet all requirements for
drinking, washing and sanitation. WHO guidelines aim for a per capita provision of 40 to 50
litres per day for domestic use only, thus a village of 500 people has a requirement of 20
cubic metres per day. Most villages have a need for combined domestic and livestock watering
which will require much greater amounts of water.
Irrigation requirements depend upon crop water requirements, effective groundwater
contributions and efficiency of the distribution and field application system.
Irrigation requirements can be determined by consultation with local experts and agronomists
or by reference to FAO document: Crop evapotranspiration - Guidelines for computing crop
water requirements - FAO Irrigation and drainage paper 56, Richard G. Allen, Luis S. Pereira,
Dirk Raes, Martin Smith http://www2.webng.com/bahirdarab/Evapotranspiration.pdf
Also see
• Micro-Irrigation Practical Action Technical Brief
• Modern Irrigation Technologies for Smallholders in Developing Countries
• Operation and Maintenance of Small Irrigation Schemes
• Small-scale Irrigation
Assessing water availability
Several water source parameters need to be taken into account and where possible measured.
These are the depth of the water source below ground level, the height of the storage tank or
water outlet point above ground level and seasonal variations in water level. The drawdown or
drop in water level after pumping has commenced also needs to be considered for well and
borehole supplies. This will depend on the ratio between pumping rate and the rate of refill of
the water source, and should be measured and/or provided by those who drill the borehole In
addition, there is usually a seasonal variation in the water level , and a long term trend in the
7. Solar (PV) water pumping Practical Action
7
water table level dropping.
The pattern of water use should also be considered in relation to system design and storage
requirements. Water supply systems should include sufficient covered water storage to provide
for daily water requirements and short periods of cloudy weather. Generally, two to five days
water demand is stored.
Sizing solar pumps
The hydraulic energy required (kWh/day)
= volume required (m³/day) x head (m) x water density x gravity / (3.6 x 106
)
= 0.002725 x volume (m³/day) x head (m)
The solar array power required (kWp) =
Hydraulic energy required (kWh/day)
Av. daily solar irradiation (kWh/m²/day x F x E)
where F = array mismatch factor = 0.80 on average (a safety factor for real panel
performance in hot sun and after 10-20 years)
and E = daily subsystem efficiency = 0.25 - 0.40 typically
Economics
In general photovoltaic pumps are economic compared to diesel pumps up to approximately
3kWp for village water supply and to around 1kWp for irrigation.
Links and further reading
• Solar Water Pumping Guide (63 pages - 4Mb pdf file) Green Empowerment
This step-by-step guide was developed to step NGOs through the technical and
community feasibility, initial design and budgeting aspects of solar water pumping
projects. You can download the document below.
• Solar Energy for Rural Communities: The Case of Namibia
Yaron, Gil; Forbes, Tani and Jansson, Sven, Practical Action Publishing
• Solar Water Pumping: A Handbook Jeff Kenna and Bill Gillett, Practical Action
Publishing
• Water Lifting Devices: A Handbook Third Edition
Peter Fraenkel and Jeremy Thake, Practical Action Publishing
• Practical Guide to Solar Photovoltaic Systems for Technicians: Sizing, installation and
maintenance Louineau, Jean-Paul, Practical Action Publishing
• Electricity Services in Remote Rural Communities: The Small Enterprise Model
Sanchez Teodoro, Practical Action Publishing
• A Cost and Reliability Comparison Between Solar and Diesel Powered Pumps
Solar Electric Light Fund (SELF), 2008
• Theft prevention measures for PV systems Emcon Consulting Group, Namibia
Useful addresses
Green Empowerment
140 SW Yamhill
Portland, Oregon 97204
USA
Tel: (503) 284-5774
Fax: (503) 460-0450
E-mail: info@greenempowerment.org
Web www.greenempowerment.org
Lifewater International
2840 Main Street, Morro Bay, CA 93442
Mailing address: PO Box 3131, San Luis
Obispo, CA 93403, USA
Tel: +1 805 772 0600, +1 888 543 3426
Fax: +1 805 772 0606
E-mail: info@lifewater.org
Web: http://www.lifewater.org/
8. Solar (PV) water pumping Practical Action
8
Suppliers
The most suitable suppler will depend on the part of the world in which the pump is
to installed. Information on equipment suppliers can be found on the following
websites.
• http://energy.sourceguides.com/
• http://www.ecobusinesslinks.com/solar_energy_solar_power_panels.htm
Below is a sample list of suppliers and does not imply endorsement by Practical Action.
The Old School
Eglwysfach
Machynlleth
SY20 8SX
United Kingdom
Tel & Fax: +44 (0)1654 781 241
E-mail: ian.tansley@brightlightsolar.com
Web: http://www.brightlightsolar.com
Professional renewable energy products and solutions suppliers. International experience on
solar water pumping.
Mono Pumps (Australia) Pty.
Limited,
338-348 Lower Dandenong Road,
Mordialloc 3195,
Victoria,
Australia
Web:
http://www.monopumps.com.au/en
-au/solar-products
A.Y. MacDonald Manufacturing
Company
4800 Chavenelle Road, Dubuque,
IA 5200, USA.
Tel: +1 319 583 7311
Fax: +1 319 588 0720
Web: www.aymcdonald.com
Grundfos International A/S
Poul Due Jensens Vej
7,Bjerroingbo, DK-8850 Denmark
Tel: +45 86 68 1400
Fax: +45 86 68 0468
Web: www.grundfos.com
African Energy
237 S. Miller Lane, P.O. Box 664, Saint David, Arizona
USA, 85630
Tel: 1-520-720-9475
Fax: 1-520-720-9527
Web: http://www.africanenergy.com
E-mail: info@africaenergy.com
African Energy is a specialized distributor of solar electric
and power back-up equipment focusing exclusively on the
African market, including solar water pumping systems.
Tata BP Solar India Ltd
78, Electronics City
Hosur Road
Bangalore 560 100
India
Tel: 6660 1300, 4070 2000, 4070 3000
Fax: 080-2852 0116
E-mail: tatabp@tatabp.com
Web: http://www.tatabpsolar.com/prod_gallery9.html
Tenesol
Z.A.C. de la Tour, 12-14 allée du Levant
69890 La Tour de Salvagny, France
Tel.: +33 (0)4 78 48 88 50
Fax: +33 (0)4 78 19 44 83
E-mail: standard@tenesol.com
Web: http://www.tenesol.com/en/
9. Solar (PV) water pumping Practical Action
9
This document was last updated in 2010 based on information provided by Michel
Maupoux, of Green Empowerment, who has installed solar water pumps in
Nicaragua and the Philippines.
Practical Action
The Schumacher Centre for Technology and Development
Bourton-on-Dunsmore
Rugby, Warwickshire, CV23 9QZ
United Kingdom
Tel: +44 (0)1926 634400
Fax: +44 (0)1926 634401
E-mail: inforserv@practicalaction.org.uk
Website: www.practicalaction.org/
Practical Action is a development charity with a difference. We know the simplest ideas can have the
most profound, life-changing effect on poor people across the world. For over 40 years, we have been
working closely with some of the world’s poorest people - using simple technology to fight poverty and
transform their lives for the better. We currently work in 15 countries in Africa, South Asia and Latin
America.