PROBLEM• Agricultural Irrigation in India is hampered by the Erratic Electricity supply in the rural India.• Farmers get 7-8 hours of electricity a day• They pump when electricity is available rather than when the crops need it.• This leads to water waste and adverse impact on crops• Diesel pumps have high operating costs due to increasing oil prices
SOLUTION• A Solar Water Pump extracts water from water well and collects or sprays over the field.• It uses Sun power for its operation via Solar panels. Hence it operates free of cost as against conventional Electric/Diesel Pumps.• A DC electric pump is connected to the Solar panel, hence no Inverter is required.• A Battery may be connected in order to operate the pump during Night/No-Sun Conditions
SYSTEM LAYOUT• As per the Power requirement by Water Pump, a suitable Solar Panel is selected.• The water pump is either submerged in a water well encased win well casting or kept around the water body.• A Pump controller monitors and switches the pump ON/OFF according to the water requirement.
Competitive Analysis Different Initial Capital Operating Maintenance Variety of Ease of use Dependence types of Cost/Year fuels use on grid pump Installation hasElectric Pump Low Medium Medium No to be done Yes carefully. Continuous Monitoring of DieselDiesel Pump Low High High No Consumption is No required for uninterrupted operation Installation has Partial Solar PV High Low Medium No to be done Pump (None: If battery carefully is used)
ADVANTAGES• Clean and efficient• Electricity is not required• No fuel cost• Low labour and maintenance cost• Highly reliable• Durable• Eco friendly• Long operating life ( Usually 20 to 40 years)• Easy to remove, transport and store• Non polluting• No need of complicated wiring• Simple to install
DISADVANTAGES• Solar water pumps that do not receive enough sun and run through all of their backup power will stop if you have not hard wired them into your electric grid.• Some solar pump systems lack the power of traditional systems.• If you are doing a swap out of your existing electric system for a solar water pump, you will want to be sure that the output and flow levels are the same to ensure that you dont have a loss of effectiveness.
MARKET POTENTIAL Source: KPMG Survey - 2010 Pattern of Central Financial Assistance for Solar water pumps: CFA for General Category States Rs. 30/Wp, subject to a maximum of Rs. 50,000/- per system CFA for Special Category States Rs. 30/Wp, subject to a maximum of Rs. 50,000/- per system
CASE STUDIES1. UP farmers were suffering from drought and frequent power cuts left the bore well inaccessible.2. Nonconventional Energy Development Agency (NEDA) provided them with solar based water pumps which were power cut proof.3. One of the unique feature of these environment-friendly pumps is that they are more powerful than the diesel ones and can pump out water from as deep as 200 feet and up to 12 hours at a stretch.4. NEDA has successfully installed two such pumps in rocky terrain of Sonebhadra district.
CASE STUDIES1. Tata BP solar stepped in at the request of Punjab Energy Development Agency.2. They provided the farmers with 2HP DC surface pumps powered by the sun.3. The Punjab Energy Development Agency, offered the pumping system to farmers at an end user contribution of just Rs.35000/-.4. The solar water pumps were a runaway success from day one.
VARIOUS SOLAR PUMPS Submersible Solar Pumps lift up to 650 feet and fit in a 4" or larger well casing and are used when the water supply is more than 20 feet from the surface. They can operate directly off solar panels, batteries, or in some cases, an AC power source. Surface Solar Pumps are good for applications with shallow wells, ponds, streams or storage tanks. They are best if the water supply is 20 feet or less from the surface. Linear Current Boosters For Pumps (LCBs) allow the pump motor to run longer during the day by translating additional voltage to necessary current during periods of low sun. Circulating Pumps are used primarily in solar water heating applications.
PUMP SELECTION1. Sun Conditions2. Water Requirements3. Total Vertical Head4. Depth of Well (for submersible type)5. Pipe Length6. Water temperature7. Water quality/storage8. Location (Longitude/Latitude)9. Solar Cable Length10. Power Supply (Solar Direct/Battery)