1. Mono block 0.5 HP Pump ( 0.37 KW , 2800 RPM, 3.0 A) available off-the- shelf in the market. AC Voltage 180 to 240 Volts.
2. Inverter (1500 VA) with Battery (150AH)
3. Solar panels 500 Watt
A less powerful inverter , battery and solar panels could be used but to be on safe side I used a higher powered one.
Why Battery ? This contraption would use solar energy. The output of a solar panel waxes and wanes during the course of a day. Even a passing cloud brings about a sharp, even though transient, fall in electricity output. A battery would help even out these fluctuations. Additionally, since an irrigation pump is only used intermittently this battery would be used for powering TV’s, Fans, and light bulbs when the pump is not in use. This would be bonus in a state like Bihar where lack of electricity is a cronic problem.
A customized cart with niches/ shelves for keeping the pump , Inverter, and batteries would be used. The Solar plates would be kept in a cage made of iron nets. It would have four segments, all six inches deep. The cage would prevent direct handling of the solar panels and protect them if a street urchin decides to throw, out of fun, a stone at it. The cage would also be helpful in preventing damage during a hail-storm. This cage would be so kept on the cart that one of its sides could be moved UP or DOWN so as to face the sun at an appropriate angle. This cart would have four wheels and two handles, one or either side, so that it could be lifted up if necessary. The Cart would be pulled manually.
The three components viz. (1)Mono Block pump , (2) Inverter/ Battery and (3) the Solar panels would be connected with each other on the cart so that they can be used at the site without any further ado. However, if needed, the components can be taken apart and refitted at the site even by an untrained person – only the wires have to be connected / disconnected. Use of plugs and sockets would make the task only infinitely easier.
I have actually tested the performance of such a pump and it is as given below:
Depth From which water is lifted (in meters) Output (Litres per Hour)
Cost computation (INR):
Mono Block Pump – Rs 4200/-
Inverter (1500 VA) with Battery (150AH)– Rs 33,000/-
Solar panels 500 W – Rs 36,500/-
Total – Rs 73700/-
Customized cart approx Rs 3000/-
Grand Total :- Rs 76700/-
Version 2 :- Motorized Pump 2 ( Mono Block)
A small farmer with a lesser requirements of water may find it more convenient to have an extra battery so that he does not have to move the solar panels to the field and this extra battery can be charged at home. The extra battery will cost extra Rs 11000/- and the total cost would go up to Rs 87700/- . Portability in this version would be easier still.
I have tried to satisfy all the requirements :-
· Capability: how well does the pump perform compared to existing diesel pumps? How well does it address the current problems with renewable energy pumps?
· Viability: does the design have broad applicability? Is it easily usable? Does it fit into farmers’ lives and work habits, or will it require education?
Yes, the design has broad applicability. It easily usable. It will fit into farmers’ lives and work habit without any special education.
· Affordability: is the design within reach of farmers without relying on government subsidies?
Yes, it is affordable and would require no subsidies.
· Feasibility: how close is the design to being a workable product? Does it require additional technological advances or development?
Yes, it is a feasible design and requires no additional technological advances and developments.
o theft prevention -- farmer can take it inside the house at night and when away
Yes, it can be taken inside the house
o can be easily used at different wells / by water merchants
Yes, it can be easily used at different wells / by water merchants.
o easy transport for demonstration and sale in local markets
Yes, it is easy to transport for demonstration and sale in local markets
· Robust under Bihar climate and rural use conditions, locally serviceable
Yes it is Robust under Bihar climate and rural use conditions, and can be locally serviceable
· Pump and deliver enough water to irrigate 1 hectare of typical Bihar produce (wheat or vegetables) from a depth of 5m. A micro irrigation water delivery system can be part of the system, but its cost must be included in the total system cost.
Yes, this Pump can deliver enough water and can lift it up from a depth of 05.Meters or more.
· Total system cost must not exceed “one lakh” Indian rupees (100,000 rupees; ca. US$ 1500 at current exchange rate)
Total system cost is without extra battery Rs 76700/- and with extra battery Rs 87700/-
· Assuming a groundwater table at 5m depth
Yes, it can lift water it up from a depth of 05.00 meters or more. I actually used it for lifting water from 05 meters to upto 9.00 meters.
c/o Dr Mohan Mishra
Ambalike, Bengali Tola