Difference between revisions of "Photovoltaic (PV) Pumping"

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<div></div><div>Regular cleaning of PV modules and maintenance by competent personnel as well as reliable availability of replacement parts are a basic requirement for efficient and sustainable system operation. Furthermore, awareness campaigns for users as well as an appropriate maintenance concept with private sector participation are essential for success. Experience from PV pumping project have shown that there is a general danger from theft and vandalism of PV modules. Measures such as the construction of walls or fences can reduce this risk, as can awareness raising activities among the local population.</div><div>There are two distinct fields of application for PV pumping systems: drinking water supply and irrigation.</div>
+
= Overview =
−
= Drinking Water Supply =
+
 
−
<div>For sites up to about 2,000 inhabitants and pumping heads up to about 60 meters PV pumping systems are often more cost-effective than diesel pumps, or at least competitive. For larger systems, a combination of PV and diesel pumps has proven worthwhile (hybrid systems).</div><div>A big disadvantage are still the high investment costs for a PV pumping system which can be up to 2-3 times the investment for a comparable diesel pump in a village with 1,000-2,000 inhabitants. However, the overall costs (investment + operation) for small PV pumping systems (1 kWp) are well below of comparable diesel pumps. For medium size systems (2 kWp), comparison is still in favour of PV pumps. For systems of 4 kWp and larger, a break even situation arises which requires proper cost comparison depending on the local conditions.</div><div>There is broad application for medium-sized standard systems of 2kWp and a pumping capacity of 1,000 m<sup>4</sup>/day (m<sup>4</sup>/day = flow rate (m³) x pumping head (m) per day, equals e.g. about 35 m³/day x 30 m head) on sunny days. This amount of water is sufficient to supply about 1,400 people with 25 liters/person/day. A study from 2008 revealed for Senegal that solar pumping systems are more cost-effective than diesel pumps up to a pumping capacity of 3,150 m<sup>4</sup>/day. This equals a daily total amount of water of 45m³ with a pumping head of 70 meters supplying 2,000 people.</div>
+
<u>There are two distinct fields of application for '''Photovoltaic (PV) '''pumping systems:</u>
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{| cellspacing="0" cellpadding="0" border="1"
+
 
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|+ Pumping Capacity of PV pumping systems for drinking water
+
#drinking water supply
 +
#irrigation
 +
 
 +
Experience from past projects has proven PV pumping systems to be technically mature and suitable for utilization in rural areas of developing countries. The systems in use have very low failure rates (below 1,5% of operation time) and are therefore highly reliable. The daily operation does not require specially-trained personnel, maintenance efforts and costs are low; therefore the comparatively high investment costs can be compensated. Regular cleaning of PV modules and maintenance by competent personnel as well as reliable availability of replacement parts are a basic requirement for efficient and sustainable system operation. Furthermore, awareness campaigns for users as well as an appropriate maintenance concept with private sector participation are essential for success. Experience from PV pumping project have shown that there is a general danger from theft and vandalism of PV modules. Measures such as the construction of walls or fences can reduce this risk, as can awareness raising activities among the local population.<br/>
 +
 
 +
<br/>
 +
<div>
 +
= Drinking Water Supply =
 +
For sites up to about 2,000 inhabitants and pumping heads up to about 60 meters PV pumping systems are often more cost-effective than diesel pumps, or at least competitive. For larger systems, a combination of PV and diesel pumps has proven worthwhile ([[Hybrid_Systems|hybrid systems]]). A big disadvantage are still the high investment costs for a PV pumping system which can be up to 2-3 times the investment for a comparable diesel pump in a village with 1,000-2,000 inhabitants. However, the overall costs (investment + operation) for small PV pumping systems (1 kWp) are well below of comparable diesel pumps. For medium size systems (2 kWp), comparison is still in favour of PV pumps. For systems of 4 kWp and larger, a break even situation arises which requires proper cost comparison depending on the local conditions. There is broad application for medium-sized standard systems of 2kWp and a pumping capacity of 1,000 m<sup>4</sup>/day (m<sup>4</sup>/day = flow rate (m³) x pumping head (m) per day, equals e.g. about 35 m³/day x 30 m head) on sunny days. This amount of water is sufficient to supply about 1,400 people with 25 liters/person/day. A study from 2008 revealed for Senegal that solar pumping systems are more cost-effective than diesel pumps up to a pumping capacity of 3,150 m<sup>4</sup>/day. This equals a daily total amount of water of 45m³ with a pumping head of 70 meters supplying 2,000 people.<br/></div><div><br/></div>
 +
{| cellspacing="0" cellpadding="0" border="1" style="width: 100%"
 
|-
 
|-
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| width="158" | <div>'''PVP -Power'''</div>
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| style="width: 158px;  background-color: rgb(204, 204, 204)" | <div>'''PVP -Power'''</div>
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| width="139" | <div align="center">'''Head'''</div><div align="center">'''[m]'''</div>
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| style="width: 158px;  background-color: rgb(204, 204, 204)" | <div style="text-align: center">'''Head'''</div><div style="text-align: center">'''[m]'''</div>
−
| width="158" | <div align="center">'''Flow Rate'''</div><div align="center">'''[m³]'''</div>
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| style="width: 158px;  background-color: rgb(204, 204, 204)" | <div style="text-align: center">'''Flow Rate'''</div><div style="text-align: center">'''[m³]'''</div>
−
| valign="top" width="158" | <div align="center">'''People Supplied'''</div><div align="center">'''(Consuming 25 l/c*d)'''</div>
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| style="width: 158px;  background-color: rgb(204, 204, 204)" | <div style="text-align: center">'''People Supplied'''</div><div style="text-align: center">'''(Consuming 25 l/c*d)'''</div>
 
|-
 
|-
−
| width="158" | <div>'''1 kWp''' (equals about 500 m<sup>4</sup>/day)</div>
+
| style="width: 158px" | <div>'''1 kWp''' (equals about 500 m<sup>4</sup>/day)</div>
−
| width="139" | <div align="center">10</div><div align="center">30</div><div align="center">50</div>
+
| style="width: 139px" | <div style="text-align: center">10</div><div style="text-align: center">30</div><div style="text-align: center">50</div>
−
| width="158" | <div align="center">50</div><div align="center">15</div><div align="center">10</div>
+
| style="width: 158px" | <div style="text-align: center">50</div><div style="text-align: center">15</div><div style="text-align: center">10</div>
−
| valign="top" width="158" | <div align="center">2000</div><div align="center">600</div><div align="center">400</div>
+
| style="vertical-align: top;  width: 158px" | <div style="text-align: center">2000</div><div style="text-align: center">600</div><div style="text-align: center">400</div>
 
|-
 
|-
−
| width="158" | <div>'''2 kWp''' (equals about 1000 m<sup>4</sup>/day)</div>
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| style="width: 158px" | <div>'''2 kWp''' (equals about 1000 m<sup>4</sup>/day)</div>
−
| width="139" | <div align="center">10</div><div align="center">30</div><div align="center">50</div>
+
| style="width: 139px" | <div style="text-align: center">10</div><div style="text-align: center">30</div><div style="text-align: center">50</div>
−
| width="158" | <div align="center">100</div><div align="center">35</div><div align="center">20</div>
+
| style="width: 158px" | <div style="text-align: center">100</div><div style="text-align: center">35</div><div style="text-align: center">20</div>
−
| valign="top" width="158" | <div align="center">4000</div><div align="center">1400</div><div align="center">800</div>
+
| style="vertical-align: top;  width: 158px" | <div style="text-align: center">4000</div><div style="text-align: center">1400</div><div style="text-align: center">800<br/></div>
 
|-
 
|-
−
| width="158" | <div>'''4 kWp''' (equals about 2000 m<sup>4</sup>/day)</div>
+
| style="width: 158px" | <div>'''4 kWp''' (equals about 2000 m<sup>4</sup>/day)</div>
−
| width="139" | <div align="center">10</div><div align="center">30</div><div align="center">50</div>
+
| style="width: 139px" | <div style="text-align: center">10</div><div style="text-align: center">30</div><div style="text-align: center">50</div>
−
| width="158" | <div align="center">200</div><div align="center">65</div><div align="center">40</div>
+
| style="width: 158px" | <div style="text-align: center">200</div><div style="text-align: center">65</div><div style="text-align: center">40</div>
−
| valign="top" width="158" | <div align="center">8000</div><div align="center">2600</div><div align="center">1600</div>
+
| style="vertical-align: top;  width: 158px" | <div style="text-align: center">8000</div><div style="text-align: center">2600</div><div style="text-align: center">1600</div>
 
|}
 
|}
  
 +
<br/>
  
−
 
+
{| cellspacing="0" cellpadding="0" border="1" style="width: 100%"
−
{| cellspacing="0" cellpadding="0" border="1"
 
−
|+ Average Investment für PV Pumping Systems for Drinking Water
 
 
|-
 
|-
−
| width="284" | <div>'''Average Investment &nbsp;[Euro]'''</div>
+
| style="width: 284px;  background-color: rgb(204, 204, 204)" | <div>'''Average Investment [Euro]'''</div>
−
| width="94" | <div align="center">'''1 kWp'''</div>
+
| style="width: 284px;  background-color: rgb(204, 204, 204)" | <div style="text-align: center">'''1 kWp'''</div>
−
| width="95" | <div align="center">'''2 kWp'''</div>
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| style="width: 284px;  background-color: rgb(204, 204, 204)" | <div style="text-align: center">'''2 kWp'''</div>
−
| width="85" | <div align="center">'''4 kWp'''</div>
+
| style="width: 284px;  background-color: rgb(204, 204, 204)" | <div style="text-align: center">'''4 kWp'''</div>
 
|-
 
|-
−
| width="284" | <div>'''Pumping System '''(PV-Generator, Inverter, Pump)</div>
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| style="width: 284px" | <div>'''Pumping System '''(PV-Generator, Inverter, Pump)</div>
−
| width="94" | <div align="center">8000</div>
+
| style="width: 94px" | <div style="text-align: center">8000<br/></div>
−
| width="95" | <div align="center">15000</div>
+
| style="width: 95px" | <div style="text-align: center">15000</div>
−
| width="85" | <div align="center">25000</div>
+
| style="width: 85px" | <div style="text-align: center">25000</div>
 
|-
 
|-
−
| width="284" | <div>'''Ready-to-operate &nbsp;PV Pumping System''' (Pumping system, logistics, set-up, reservoir, construction, water distribution)</div>
+
| style="width: 284px" | <div>'''Ready-to-operate PV Pumping System''' (Pumping system, logistics, set-up, reservoir, construction, water distribution)</div>
−
| width="94" | <div align="center">16000</div>
+
| style="width: 94px" | <div style="text-align: center">16000</div>
−
| width="95" | <div align="center">25000</div>
+
| style="width: 95px" | <div style="text-align: center">25000</div>
−
| width="85" | <div align="center">41000</div>
+
| style="width: 85px" | <div style="text-align: center">41000</div>
 
|}
 
|}
  
−
[[Image:Pv_pumping_costs.png|Comparison of specific pumping costs for different PV pumping systems and diesel pumps]]
+
<br/>
  
−
= Irrigation =
+
[[File:Pv pumping costs.png|thumb|center|180px]]
−
<div>Economics of PV pumping systems for irrigation is dependent on numerous factors. In general, PV pumps for irrigation can only be operated cost-efficiently under the following conditions:</div>
+
 
−
*In order to reduce the energy requirements of PVP irrigation systems water-conserving and energy-saving micro-irrigation techniques have to be applied.  
+
= Irrigation<br/> =
−
*The plot size for PVP irrigation should be below 4 hectares.  
+
<div>Economics of PV pumping systems for irrigation is dependent on numerous factors.<br/></div><div><u>In general, PV pumps for irrigation can only be operated cost-efficiently under the following conditions:</u><br/></div><div><br/></div>
−
*High rates of system utilisation are necessary to achieve economic viability of PVP irrigation systems.  
+
*In order to reduce the energy requirements of PVP irrigation systems water-conserving and energy-saving micro-irrigation techniques have to be applied.
−
*Therefore PVP systems are limited to irrigate permanent crops and continuous crop rotation in arid climates.  
+
*The plot size for PVP irrigation should be below 4 hectares.
−
*High value-added cash crops like fruits, vegetables and spices should be given preference to recoup the high initial investment.  
+
*High rates of system utilisation are necessary to achieve economic viability of PVP irrigation systems.
−
*Low-interest loans should be available for the same reason.  
+
*Therefore PVP systems are limited to irrigate permanent crops and continuous crop rotation in arid climates.
 +
*High value-added cash crops like fruits, vegetables and spices should be given preference to recoup the high initial investment.
 +
*Low-interest loans should be available for the same reason.
 
*PVP irrigation systems require a careful planning of the crop schedule and are more demanding of user skills.
 
*PVP irrigation systems require a careful planning of the crop schedule and are more demanding of user skills.
  
 +
<br/>
 +
 +
== Case Study:India ==
 +
 +
► For information about use of pumping system for irrigation in [[India_Energy_Situation|India]], see [[Photovoltaic_(PV)_Pumping_Systems_for_Irrigation|Photovoltaic (PV) Pumping Systems for Irrigation]]
 +
 +
<br/>
 +
 +
== Case Study:Jordan ==
 +
 +
► For information about large scale solar pumping in agriculture in [[Jordan_Energy_Situation|Jordan]], see [[Prospects_of_Large_Scale_Solar_Water_Pumping_Applications_for_Agriculture_with_a_Case_Study_from_Jordan|Prospects of Large Scale Solar Water Pumping Applications for Agriculture with a Case Study from Jordan]]
 +
 +
<br/>
 +
 +
= Project Experiences<br/> =
 +
 +
'''Gesellschaft für Internationale Zusammenarbeit ([http://www.giz.de/en/ GIZ])''' has experience of PVP irrigation in projects in [[Chile_Energy_Situation|Chile]] (smallholder farmers), [[Ethiopia_Energy_Situation|Ethiopia]] (tree nursery Forestry Dep.) and [[Bangladesh_Energy_Situation|Bangladesh]] (irrigation of paddy fields).
 +
 +
Experience in Bangladesh has shown that PV panels can have significant spatial requirements depending on the energy needed. This leads to disadvantages for farmers. [http://www.kfw.de/kfw/en/index.jsp KfW](German Development Bank) has supported the installation and dissemination of PVP pumps for irrigation in several countries in sub-Saharan Africa (Eritrea, Guinea, Mali, Namibia, Burkina Faso). At experimental level there are already technical solutions available for the application of PVP in stand-alone systems to irrigate an area of 30-40 hectares by using '''variable frequency drives (VFD)''' for any AC-motor.
 +
 +
<br/>
 +
 +
= Further Information<br/> =
 +
 +
*[[Portal:Solar|Solar portal on energypedia]]<br/>
 +
*[[Toolbox on SPIS|Toolbox on Solar Powered Irrigation Systems]]
 +
*[[Design_of_Photovoltaic_(PV)_Pumping|Design of Photovoltaic (PV) Pumping]]
 +
*[[:File:Policy Recommendations to Improve the Sustainability of Rural Water Supply Systems.pdf|Policy Recommendations to Improve the Sustainability of Rural Water Supply Systems]]
 +
*GIZ INTERNAL: [https://dms.gtz.de/livelink-ger/livelink.exe?func=ll&objId=57642651&objAction=browse DMS folder]containing additional documents on PV pumping (documents also available upon request from [mailto:hera@gtz.de GTZ-HERA])
 +
*[http://net.grundfos.com/doc/webnet/renewables/solar.html Product overview] and [http://net.grundfos.com/doc/webnet/renewables/cases.html cases] of market leader Grundfos
 +
*[[Decentralized_Drinking_Water_Supply|Drinking water supply]]
 +
*[http://agriwaterpedia.info/wiki/Solar_Powered_Water_Pumps Solar Powered Water Pumps]: overview of the strengths, weaknesses, opportunities and threats of photovoltaic pumps (PVP)
 +
*[[:File:Solarpumpen_zur_Bewässerung-Erfahrungen,_Status_und_Perspektiven_-.pdf|Solarpumpen zur Bewässerung-Erfahrungen, Status und Perspektiven -.pdf]]<br/>
 +
 +
<br/>
 +
 +
 +
= References<br/> =
  
 +
<references />
  
−
[[Category:Solar]][[Category:Energy_Use]]
+
[[Category:Water_Supply]]
 +
[[Category:Lessons_Learned]]
 +
[[Category:Photovoltaic_(PV)]]
 +
[[Category:Solar]]
 +
[[Category:India]]
 +
[[Category:Jordan]]
 +
[[Category:Solar_Pumping]]
 +
[[Category:Pumping]]

Latest revision as of 13:05, 29 May 2018

Overview

There are two distinct fields of application for Photovoltaic (PV) pumping systems:

  1. drinking water supply
  2. irrigation

Experience from past projects has proven PV pumping systems to be technically mature and suitable for utilization in rural areas of developing countries. The systems in use have very low failure rates (below 1,5% of operation time) and are therefore highly reliable. The daily operation does not require specially-trained personnel, maintenance efforts and costs are low; therefore the comparatively high investment costs can be compensated. Regular cleaning of PV modules and maintenance by competent personnel as well as reliable availability of replacement parts are a basic requirement for efficient and sustainable system operation. Furthermore, awareness campaigns for users as well as an appropriate maintenance concept with private sector participation are essential for success. Experience from PV pumping project have shown that there is a general danger from theft and vandalism of PV modules. Measures such as the construction of walls or fences can reduce this risk, as can awareness raising activities among the local population.


Drinking Water Supply

For sites up to about 2,000 inhabitants and pumping heads up to about 60 meters PV pumping systems are often more cost-effective than diesel pumps, or at least competitive. For larger systems, a combination of PV and diesel pumps has proven worthwhile (hybrid systems). A big disadvantage are still the high investment costs for a PV pumping system which can be up to 2-3 times the investment for a comparable diesel pump in a village with 1,000-2,000 inhabitants. However, the overall costs (investment + operation) for small PV pumping systems (1 kWp) are well below of comparable diesel pumps. For medium size systems (2 kWp), comparison is still in favour of PV pumps. For systems of 4 kWp and larger, a break even situation arises which requires proper cost comparison depending on the local conditions. There is broad application for medium-sized standard systems of 2kWp and a pumping capacity of 1,000 m4/day (m4/day = flow rate (m³) x pumping head (m) per day, equals e.g. about 35 m³/day x 30 m head) on sunny days. This amount of water is sufficient to supply about 1,400 people with 25 liters/person/day. A study from 2008 revealed for Senegal that solar pumping systems are more cost-effective than diesel pumps up to a pumping capacity of 3,150 m4/day. This equals a daily total amount of water of 45m³ with a pumping head of 70 meters supplying 2,000 people.

PVP -Power
Head
[m]
Flow Rate
[m³]
People Supplied
(Consuming 25 l/c*d)
1 kWp (equals about 500 m4/day)
10
30
50
50
15
10
2000
600
400
2 kWp (equals about 1000 m4/day)
10
30
50
100
35
20
4000
1400
800
4 kWp (equals about 2000 m4/day)
10
30
50
200
65
40
8000
2600
1600


Average Investment [Euro]
1 kWp
2 kWp
4 kWp
Pumping System (PV-Generator, Inverter, Pump)
8000
15000
25000
Ready-to-operate PV Pumping System (Pumping system, logistics, set-up, reservoir, construction, water distribution)
16000
25000
41000


Pv pumping costs.png

Irrigation

Economics of PV pumping systems for irrigation is dependent on numerous factors.
In general, PV pumps for irrigation can only be operated cost-efficiently under the following conditions:

  • In order to reduce the energy requirements of PVP irrigation systems water-conserving and energy-saving micro-irrigation techniques have to be applied.
  • The plot size for PVP irrigation should be below 4 hectares.
  • High rates of system utilisation are necessary to achieve economic viability of PVP irrigation systems.
  • Therefore PVP systems are limited to irrigate permanent crops and continuous crop rotation in arid climates.
  • High value-added cash crops like fruits, vegetables and spices should be given preference to recoup the high initial investment.
  • Low-interest loans should be available for the same reason.
  • PVP irrigation systems require a careful planning of the crop schedule and are more demanding of user skills.


Case Study:India

► For information about use of pumping system for irrigation in India, see Photovoltaic (PV) Pumping Systems for Irrigation


Case Study:Jordan

► For information about large scale solar pumping in agriculture in Jordan, see Prospects of Large Scale Solar Water Pumping Applications for Agriculture with a Case Study from Jordan


Project Experiences

Gesellschaft für Internationale Zusammenarbeit (GIZ) has experience of PVP irrigation in projects in Chile (smallholder farmers), Ethiopia (tree nursery Forestry Dep.) and Bangladesh (irrigation of paddy fields).

Experience in Bangladesh has shown that PV panels can have significant spatial requirements depending on the energy needed. This leads to disadvantages for farmers. KfW(German Development Bank) has supported the installation and dissemination of PVP pumps for irrigation in several countries in sub-Saharan Africa (Eritrea, Guinea, Mali, Namibia, Burkina Faso). At experimental level there are already technical solutions available for the application of PVP in stand-alone systems to irrigate an area of 30-40 hectares by using variable frequency drives (VFD) for any AC-motor.


Further Information



References

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