Solar Water Pumps

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A Solar Water pump is a normal pump with an electric motor. To generate the electricity needed for the engine on-site, a photo voltaic panel converts the sun's energy into a continuous electric current (12 or 24V in general) that can be stored in a solar battery park. 

Since photo voltaic panels generate a continuous electric current, a solar water pump equipped with a DC motor must be used. Small-scale pumping irrigation is one of the most interesting uses of solar energy since the maximum intensity of solar radiation is generally the period of the most important pumping water requirements. 

On the other hand, this energy is available just at the point of use.

A solar pump can also be used in a motor home or a house to put the water stored in a pressure tank and make it available for domestic use.
  • A photo voltaic pump comes in two ways depending on whether it works with or without a battery.
  • The first uses a solar battery to store the electricity produced by the panels, it allows night use or in bad sunlight conditions and eliminates the problems of adaptation between solar panels and solar water pumps.
  • The pumping rate can be on demand, when users need it, or allow regular pumping throughout the day.
  • The pump without battery, or "pump with the wire of the sun", in general, sends the water towards a tank to store it until the moment of its use.

Solar Water Pump System:


How To Determine the Correct Pump:
  • The desired flow rate (in cubic meter hour).
  • Total Manometric Height (HMT)
  • The supply voltage of the pump (12 or 24V)
  • The flow is determined according to the needs. It is advisable to draw up a sizing sheet showing the number of cubic meters needed per day in domestic water, gardening water, market gardening and beverage for livestock Solar Water Pump.

The Total Manometric Height is expressed in meters of the water column and is calculated by adding several parameters which vary according to the choice between the surface pump and submerged pump.

For a surface pump:
  • The HGA: Geometric suction height (Max 7m)
  • The HGR: Geometric head of discharge or difference in elevation (distance in meters between the point of pumping in the well and the point of use of the water)
  • Suction pressure drops in the pipe or PA (depending on the length and diameter of the pipe)
  • Pressure drops in the pipe (depending on the length and diameter of the pipe)
  • Finally the working pressure (in the bar or kilo Pascal, 1 bar = 10 m-meter water column)
For a submerged pump:
  • HGR: Geometric head of discharge, IE the total depth of the immersion of the pump plus the difference in height.
  • Pressure drops in the pipe (depending on the length and diameter of the pipe)
  • And finally the working pressure (in bar or kilo Pascal, 1 bar = 10 m-meter water column)

Namely, the HMA, or manometric suction head, which is calculated by adding the HGA and the PA, must always be lower than the suction capacity of the Solar Water Pump (specified in the technical documentation of the products).

Taking into account the height:
  • For heights of less than 7 meters, prefer the use of suction pumps.
  • For an average HMT (total head), between 10 and 50 meters, the submerged centrifugal pump is usually the most efficient. But its performance is very closely related to the HMT and its dimensionless is critical.

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