A Solar Photovoltaic (SPV) Water Pumping System consists of :
These ranges of Solar Photovoltaic (SPV) Water Pumping Systems are basically for “MICRO PUMPING”applications. However, these may also be used for “Drinking Water Applications wherever such capacities are required”.
PV Array should be mounted on a suitable structure with a provision for manual tracking.
Interconnect Cables and
Solar PV Water Pumps with PV Panel capacity in the range of 200 Wp to 500 Wp may be installed on a suitable bore-well / open well / Water Reservoir / Water stream etc.
Under the “Average Daily Solar Radiation” condition of 7.15 KWh / sq.m.on the surface of PV array (i.e. coplanar with the PV Modules), the minimum water output from a Solar PV Water Pumping System at different “Total Dynamic Heads” should be as specified below:
Under the “Average Daily Solar Radiation” condition of 7.15 KWh / sq.m.on the surface of PV array (i.e. coplanar with the PV Modules), the minimum water output from a Solar PV Water Pumping System at different “Total Dynamic Heads” should be as specified below :
The actual duration of pumping of water on a particular day and the quantity of water pumped could vary depending on the solar intensity, location, season, etc.
Indicative performance specifications for the Shallow and Deep well SPV Water Pumping Systems are given in the below table:
|Model - I||Model - II||Model - III||Model - IV||Model - V||Model - VI|
|PV array||300 Wp||300 Wp||300 Wp||500 Wp||500 Wp||500 Wp|
|Motor capacity||0.25 hp||0.25 hp||0.25 hp||0.5 hp||0.5 hp||0.5 hp|
|Shut Off Dynamic Head||12 metres||30 metres||45 metres||12 metres||30 metres||45 metres|
|Water output*||10,000 litres per day from a total head of 10 metres||5,000 litres per day from a total head of 20 metres||3,000 litres per day from a total head of 30 metres||20,000 litres per day from a total head of 10 metres||10,000 litres per day from a total head of 20 metres||6,000 litres per day from a total head of 30 metres|
Water output figures are on a clear sunny day with three times tracking of SPV panel, under the “Average Daily Solar Radiation” condition of 7.15 KWh/ sq.m. on the surface of PV array (i.e. coplanar with the PV Modules).
The SPV water pumping system should be operated with a PV array capacity in the range of 200 Watts peak to 500 Watts peak, measured under Standard Test Conditions (STC). Sufficient number of modules in series and parallel could be used to obtain the required PV array power output. The power output of individual PV modules used in the PV array, under STC, should be a minimum of 75 Watts peak, with adequate provision for measurement tolerances. Use of PV modules with higher power output is preferred.
Indigenously produced PV module (s) containing mono/ multi crystalline siliconsolar cells should be used in the PV array for the SPV Water Pumping systems.
The SPV water pumping systems may use any of the following types of motor pump sets:
The “Motor Pump Set” should have a capacity in the range of 0.2 hp to 0.5 hp and should have the following features:
It is recommended that all parts of the pump and the motor of the submersible pumps should be made of stainless steel or suitable grade of plastic. The impellers and other internal parts can be of suitable grade of modified PPE resins (example Noryl) or Polycarbonate or equivalent.
The following details should be marked indelibly on the motor pump set
The suction/ delivery pipe (GI/HDPE), electric cables, floating assembly, civil work and other fittings required to install the Motor Pump set.
The PV modules should be mounted on metallic structures of adequate strength and appropriate design, which can withstand load of modules and high wind velocities up to 150 km per hour. The support structure used in the pumping system should be hot dip galvanized iron with minimum 80 micron thickness.
To enhance the performance of SPV water pumping systems, manual or passive or auto tracking system must be used. For manual tracking, arrangement for seasonal tilt angle adjustment and three times manual tracking in a day should be provided.
A good reliable switch suitable for DC use is to be provided. Sufficient length of cable should be provided for inter-connection of the PV array, Controller / Inverter and the motor pump set.
The PV Modules must be warranted for output wattage, which should not be less than 90% at the end of 10 years and 80% at the end of 25 years. The whole system including submersible/ surface pumps shall be warranted for 5 years. Required Spares for trouble free operation during the Warrantee period should be provided along with the system.
An Operation and Maintenance Manual, in English and the local language, should be provided with the solar PV pumping system. The Manual should have information about solar energy, photovoltaic, modules, DC/AC motor pump set, tracking system, mounting structures, electronics and switches. It should also have clear instructions about mounting of PV module, DO's and DONT's and on regular maintenance and Trouble Shooting of the pumping system. Name and address of the person or Centre to be contacted in case of failure or complaint should also be provided. A warranty card for the modules and the motor pump set should also be provided to the beneficiary.
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