SOLAR WATER PUMPS- BRIGHT SOLAR ,AHMEDABAD.

1. NAMASKAR
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2. 1. Basic of Solar Pumps
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• Pumps only during daytime (more sunshine = more water)
• Peak pump capacity only during midday
• Variable speed and pump capacity
• No fixed working point
• Pump capacity depends on the size of the solar PV Array
• Use Manual tracking system to increase output

3. 2. Water Volume and Lift
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• The pump is defined by its volume [Q] and lift [H]
• Volume = [Q = m3/day]
• Max. flow [q = l/min]
• Lift = [H = m]
• Pressure [bar]

4. 3. Theory of Solar Irrigation
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5. Water requirements
6. Irrigation applications
7. Low pressure irrigation system
7.1 Micro Irrigation system
7.1.1 Filters and control
8. Traditional Irrigation (flooding)
9. Water volume management

5. 4. Water Requirements
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• Water losses by plants and environment
• Depends on crops and their development
• Soil type
• Latitude and altitude
• Evapotranspiration losses
• [ET = mm/day]
• Evaporation = by open surfaces
• Transpiration = by plants
• high = < 6.5 mm/day (tropical region)
• medium = 5 -6.5 mm/day
• low = < 5 mm/day (moderate region)
• e.g. 5.5 mm/day = 5.5 L/m2/day

6. 5. Irrigation Applications
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• Compensation of water losses to optimize plant
growth
• E.g. missing rain fall or uneven time distribution
• Irrigation is possible for one plant or a field
• Irrigation Technology
• Modern irrigation: use pressurized systems
• Sprinkler, Mini-sprinkler (spray), Drip systems
• Traditional irrigation: use flood and furrow system
• Irrigation timing: every day or in time sequences
(bigger volume)

7. 6. Low Pressure Irrigation Systems
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• From 0.5 to 2 bars (reduced energy
requirements)
• Low pressures means
• more water outlets
• more dense water distribution system
• mainly use plastic pipe and outlets (emitters)
• mainly fixed installation

8. 7.1 Micro Irrigation System
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• Mini-Sprinkler (rotating droplet types)
• Radius: 1-4 m / app. 1.5 bars
• Mini-Sprayer (mist and spray types)
• Radius: 1-3m / app. 1.25 bars

9. 7.1 Micro Irrigation System – Drip System
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• Drip Irrigation System
• Drops at each outlet with app. q = 1 l/h
• Integrated dipper
• Attached adoptable dripper
• Lay-flat tapes
• Different outlets and row spacing
• Outlets from 0.2m – 0.33m form a humid band
• Different wall thickness
• Thickness defines time of usability
• Pipe length depends on hydraulic limits
• Equal water distribution (+/- 10%)
• Different pipe or tube diameter available
• Can be buried or attached at trees, e.g. vineyards

10. 7.1 Micro Irrigation Systems - pictures
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11. 7.2 Filters and Control
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• Each system must have a filter (or several)
• Otherwise the small outlets are blocked
• Use bigger model to reduce hydraulic losses
• Disc filter is better than screen filters
• Clean the filters and pipes regularly
• Control the irrigation system at the head unit
• Install control and measurement devise for volume
and pressure
• Add an inlet to the head unit for liquid fertilizer

12. 7.2 Filters and Control - pictures
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13. 8. Traditional Irrigation (Flooding)
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• Solar pumps lift water
• Also from rivers and canals (floating version)
• Water distribution through free outlet
• Only lifting, no pressure required
• High volume with minimum head
• App. 1-6m only

14. 8. Traditional Irrigation (flooding) -
pictures
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15. 9. Water Volume Mangament
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• Flow control only by volumetric meters (water
meter)
• Time control not common in Solar-Irrigation-Systems
• Manual control is standard (automatic optional)
• Divide the irrigation plot in sections
• Section (field) sizes must be equal
• Irrigation plot must be rotated each time
• Irrigation time (volume) due to crop development
and Evapotranspiration [ET]
• Add 2nd drip-line for further crop development
and water requirement

16. IV. Application and Design
criteria
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10. BRIGHT Solar Pumps System and Irrigation
11. Design criteria
12. Examples for BRIGHT Solar Irrigations Systems

17. 10. BRIGHT Solar Pumps System and
Irrigation
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• BRIGHT SOLAR pumps can easily be connected with
many irrigation systems
• Match BRIGHT SOLAR pump with your irrigation system
(hydraulic requirements)
• Low pressure systems are cost efficient (Drip)
• Use water tank (min 3m) or direct connection

18. 11. Design Criteria Step 1
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• Check your water source and look for limitations
• Define lift and pressure [H] (TDH)
• Select the crops (plants) and water needs [ET]
• Define water volume [Q]
• Select BRIGHT Solar Pumps
• Determine size of the solar array
• Select BRIGHT Solar Modules
• Select BRIGHT SolarTracker

19. 11. Design Criteria Step 2
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• Determine low pressure irrigation system (Drip)
• Calculate hydraulic parameter (friction losses)
• Use bigger filters and pipe diameters
• Calculate max. drip line length (adopt field size )
• Define drip line row spacing (distance) and out let
spacing
• Select water meter and head unit for control and
management
• Except variation in [Q & H] during the day (no water in
the night)
• Use [Q = m3/day] and peak (max.) flow [q = l/min]
• In summer more Solar Power = more water for irrigation

20. 12. Application Sizing and Examples (1)
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• Example 1 (Greenhouse Irrigation):
• 1PM4SS-HR07 (900Wp -1 H.P. - Tracked)
• 17m³/day at 60m lift
• Medium ET: 5mm/day (~5l/m²/day)
-> Drip irrigation area 2720m² (using 80% eff.)
Greenhouse: 9m*55m = 540m² -> app. 5 greenhouses

21. 12. Application Sizing and Examples (2)
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• Example 2 (Field Irrigation):
• 2PM4-SS5-12 (1800Wp – 2 H.P. - Not tracked)
• Q = 46m³/day at H = 30m lift
• High ET: 6.5mm/day (~6,5l/m²/day)
-> Drip irrigation area 5300 m² (using 75% eff.)
Field area: app. 0.5 Ha

22. 12. Application Sizing and Examples (3)
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• Example 3 (Flood Irrigation):
• 5PM6-SS30-2 (4800Wp – 5 H.P. - tracked)
• Q = 300m³/day at H = 15m
• High ET: 5mm/day (~5l/m²/day)
-> Drip irrigation area 27000 m² (using 45% eff.)
Field area: app. 2.5Ha

23. 12. Application Sizing and Examples (4)
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• Example 4 (Flood Irrigation):
• 10PM6-SS42-4 (9600Wp – 10H.P. - tracked)
• Q = 500m³/day at H = 10m
• High ET: 5mm/day (~5l/m²/day)
-> Drip irrigation area 48000 m² (using 45% eff.)
Field area: app. 4.5 Ha

24. V. Final Conclusion
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1. Select low pressure irrigation system (micro irrigation system)
• Preferable drip irrigation system with app. 0.5 bar working pressure
2. If possible use tank with app. 5 m tower
• Optional direct system (set pressure for irrigation at app. 1 bar)
3. Match water use for irrigation with the BRIGHT solar pump capacity
• Check for the appropriate pump model
• Irrigation area depends on pump parameters [Q / H]
• [Q / H] defines the size of the solar generator
4. Control the irrigation system on volume basis (water meter)
• Subdivide the fields into equal plots
• Calculate drip line length with a +/- 10% variation in water volume
• Use bigger filters and distribution pipes to reduce friction losses
5. Use BRIGHT SOLAR power pack for peak (max) water needs in summer
• Night time irrigation

25. Installed Pump Sites in Gujarat State
Gujarat State : 5HP – 183 Systems
3HP – 64 Systems
2HP - 41 Systems
1HP - 29 Systems
7.5HP - 06 Systems
10HP - 02 Systems
Other States : More than 2000
Systems
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