# Solar Water Pump Selection Guide

In remote areas where water resources are scarce and power grids cannot fully cover, people's lives, drinking water, and agricultural production are severely affected. In recent years, due to the rapid development of the photovoltaic industry, the cost has dropped year by year, and solar products have entered people's lives. Among them, the solar pumping system combines solar products with pumping water, and innovatively applies it to domestic water, agricultural irrigation, ecological restoration, grassland animal husbandry, etc. It not only avoids a large amount of capital investment in the construction of grid infrastructure, but also solves the problem of lack of electricity and water in agricultural production.

In the solar water pump system, the water pump is the core component. Different types of pumps have different working characteristics and different efficiencies. Therefore, choosing the right water pump is one of the ways to optimize the system. The following are two important parameters for choosing a solar water pump.

## Flow Rate

The flow rate of the pump, also known as the water delivery rate, is mainly determined according to the customer's water consumption and local light conditions. The calculation formula is:

Q=Pη/ 2.73H

Where Q is the flow, P is the shaft power, η is the efficiency of the pump, 2.73 is a constant, H is the delivery head. The flow is inversely proportional to the head, that is, the lower the head, the larger the flow.

The delivery head refers to the height that the pump can lift water, and is an important working performance parameter of the pump. It should be measured according to the actual situation of the project. The following is the calculation method of the head:

H=z+hw

Where H is the lift, and z is the lift height, that is, the elevation difference between the water surface at the entrance and the water surface at the exit. And hw is the head loss, including the head loss hf along the way and the local head loss hw.

When selecting a pump, the lift of the pump needs to be enlarged by 1.3 to 1.5 times to avoid the loss of the pipeline and the problem that the pump cannot pump water when the sunlight is insufficient. If pumping water in a deep well, it is also necessary to consider that the size of the pump is smaller than the diameter of the deep well.

According to the different requirements of flow (Q) and head (H), the power level of the pump can be determined. In the solar water pump system, since the working frequency of the water pump varies with the output power of the photovoltaic array, the traditional water pump method alone cannot meet the demand. The selection can be optimized according to the H-Q curve of the pump under different operating conditions.

Our company provides you with reliable and economical solar water pumps of various power and helps you make better choices in purchases.