Solar submersible pump: What are they like and which one do I need?

    Solar submersible pump: What are they like and which one do I need?

    With submersible solar well pumping in full swing, we have decided to write a small guide to help the user find which drive device they need based on their needs. This guide will help anyone know how solar submersible pumping works, what parameters to take into account and how to size our installation.

    Solar Submersible PumpWhat is a Solar Submersible Water Pump?

    Currently, water extraction continues to be the main use of solar energy, since a solar pumping system can work anywhere without needing to be close to the electrical grid.

    It is a water pump that works mainly with direct current and whose power comes from photovoltaic modules.

    The voltages at which they work are 12 volts and 24 volts, the ampere ranges vary depending on the power of the equipment.

    Submersible Solar Water Pumps

    They are those that are placed below the surface to extract water from wells or wells, bring this water to the surface and drag it a certain distance to deposit it in water tanks, pools, cisterns, etc. This is if the solar pump output is not carrying a load.

    Solar Submersible Pump System

    Flow Estimation

    At this point we need to know the flow, what amount of water do we estimate is necessary? In this case, it is the client who must know their demand taking into account their use: domestic consumption per person, for animals, irrigation, etc.

    If you do not know how much water you need, again we can establish an approximate calculation using the following figures: 30 liters/day per person, 40 liters/day per cow, 10 liters/day per sheep... However, it is important that you do this later. a thorough calculation of these parameters, given that water consumption can vary significantly, for example depending on the climate of the facility in question.

    Let's imagine that in summer, the most unfavorable time (if we want to size the pump to meet our needs in that case), our demand is 7m3 per day (remember that 1l is = 1*10^(-3) m3); that is, 7000 liters.

    When we know the flow and head we require, we must consult the pump curves to know if it adapts to our needs or not:

    How can we know the daily production of the pump?

    The DC pumps vary their working regime depending on the power supplied by the photovoltaic panels (whose production in turn varies depending on solar radiation). The curve offered by the manufacturer reflects its nominal operation, that is, to obtain the daily production, it would be enough to multiply this production by the peak solar hours (HSP) of our region.

    Peak solar hours help estimate production by establishing a hypothetical constant solar irradiation of 1000 W/m2; That is, it is a parameter that normalizes variable daily production into a series of homogeneous production hours to simplify calculations.

    Peak solar hours of the day.

    You can easily check the peak solar hours based on your location by searching the Internet for an approximation of it. Again, in order to establish a simplified calculation, we recommend using the following example:

    Summer: from Madrid to the north of the peninsula, 6 hours daily. To the south, 7. Winter: from Madrid to the north, 3. To the south, 4.

    If we return to our case, and imagine a facility south of Madrid, the flow rate that the pump we are analyzing is capable of driving daily in the summer, based on this approximation, will be: 1,1 m3/hour x 7 hours = 7,7. 3 mXNUMX daily.

    If we had established our initial need at 7 m3, we can verify that this pump adapts perfectly to our needs.

    If this is not the case, it is as simple as carrying out one or two more interactions, testing with other pump models to make sure which solar pump best suits our needs.

    Contact Us to receive information to acquire your perfect kit.

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