Solar pump groups are the central points of systems equipped with solar collectors. The pump group is responsible for the flow of the working medium, influencing the correct operation and efficiency of the entire solar installation. It consists of a circulation pump and various measuring and safety elements. Do you want to learn more about the solar pump group? We invite you to read the guide prepared by the Onninen team.
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What should the flow be in the solar pump group?
The solar pump group is responsible for heat transport in solar installations. It connects solar collectors with water heaters. The heat received from the solar collector must be cooled, which ensures the flow of glycol. The working temperature of glycol is higher than that of water, which is why the pump elements must be made of materials with increased durability.
The flow rate of glycol depends on the parameters of the selected pump set, and these should correspond to the size of the solar installation. Manufacturers usually indicate the flow rate for which a given pump group is intended. It is generally assumed that the flow should be 0.5-1.6 l/min. for one collector. For a larger number of collectors, appropriate conversion factors are used. The solution can also be selected depending on the surface area of the solar collectors.
Sounds complicated? Don't worry, by entrusting the design and connection of a solar installation to a professional installation company, you won't have to think about selecting the flow in the pump group, the minimum capacity of the expansion tank or the diameters of the pipes. The investment will be implemented comprehensively.
When is it worth choosing a two-way solar pump group?
Solar pump groups can be divided into two main types:
- single-path solar groups – their design is compact and easy to install, they are mounted near the water heater on the return pipe;
- two-way solar groups – also called double, are highly efficient, but more demanding in assembly (mainly due to the installation on the supply and return pipes) and extensive, equipped with, among others, supply and return thermometers, a flow meter and an air separator.
Efficient, two-way (double) solar pump group offers very wide compatibility. It can work with most solar systems in large houses, e.g. two- and three-story. It will work well in domestic water heating systems and swimming pools.
What pressure should be in a solar installation?
The optimum pressure is from 1 to 4 bar. The pressure status can be read on the manometer placed in the body of the solar pump group. At this point it is worth mentioning that in addition to the basic function of forcing the flow of glycol, the solar pump group affects the safety of the entire solar installation. It has a safety valve and a connector for connecting the expansion tank (vessel).
This is a protection against excessive pressure increase. When the pressure increases to the maximum permissible limit, the safety valve will open, which will prevent damage to the installation. When selecting a solar pump group, in the technical parameters of the product, pay attention to the item "safety group", e.g. a safety group with a safety valve with an opening pressure of X bar.
Pump groups for solar panels at the Onninen wholesaler
In the Onninen electrical wholesaler you will find reliable pump groups for solar installations, equipped with an energy-saving circulation pump, a safety valve, a thermometer to control the water temperature, valves for filling and draining water, a non-return valve to prevent the backflow of fluids and a pressure gauge to monitor the operating pressure. Our solutions are intended for investors looking for pro-ecological solutions, comfortable in use and maximum efficiency. We offer solar pump groups from leading European manufacturers, such as Oventrop .
Check out the pump and solar groups at the Onninen wholesaler