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When using solar inverters, these safety issues cannot be ignored

Reasonable use of solar inverters will greatly improve the life of solar inverters and make them safer. These issues cannot be ignored when using solar inverters.

1. When using solar inverters, the voltage must be the same. Each solar inverter has a DC voltage value, such as 12 volts and 24 volts, so the battery voltage must be the same as the solar inverter DC voltage when selecting The same, for example, if your leisure battery is 12 volts, then you need to use a 12 volt inverter to use it normally.

2. The positive and negative connections of the solar inverter cannot be mistaken. The DC voltage connected to the solar inverter is usually marked with positive and negative poles, red is positive, black is negative, and the positive and negative poles are also marked on the battery, red is positive, black is negative, make sure that the positive is connected to the positive and the negative is connected. burden. The wire diameter of the connecting wire should be thick enough, and the length of the connecting wire should be reduced.

3. The output power must be greater than the power used by the on-board equipment. Pay attention to the electrical appliances with high power when starting, such as refrigerators, air conditioners and other equipment.

4. The solar inverter should be stored in a ventilated and dry place, beware of rain, and should be separated from nearby objects by more than 20cm to avoid flammable and explosive products.

5. For the sake of safety and performance, the environment where the solar inverter is installed should meet the following conditions: Dry: Do not soak in water or rain. Shade and cool: the temperature includes 0°C and 40°C. Ventilation: There is no foreign matter within 5cm on the shell, and the ventilation on the end face is well preserved.

6. In the life of connecting the battery, be careful not to have metal objects on your hands to prevent the battery from short-circuiting or burning the human body.

7. The solar inverter cannot be charged and inverted at the same time, that is, the charging plug cannot be inserted into the electrical circuit of the inverter output during the inverter.

8. In order to prevent accidents, customers are prohibited from opening the case without authorization.

How to eliminate the electromagnetic interference of solar inverter?

If there is an electromagnetic compatibility problem in the solar power generator system, these three elements must be met, namely, electromagnetic interference source, coupling path, and sensitive equipment. In the electromagnetic compatibility test, we should start with the following elements and solve one of the elements to solve the electromagnetic compatibility problem. The electromagnetic interference source of the solar inverter is the power circuit with high frequency changes, which is also difficult to solve; the sensitive equipment is external and will not be affected by the inverter control; so the key is to disconnect the coupling path. Interference transmission methods include transmission and radiation sources, and the commonly used methods are grounding, filtering and shielding. The following Xindun will explain 3 ways for you.

1. Grounding

No matter which method is used to suppress the source of EMI interference, grounding must be used to discharge static electricity in the end, so the grounding of solar inverters is very important. Grounding includes grounding, signal grounding, etc. The design of the grounding body, the layout of the ground wire, the impedance of the ground wire at different frequencies, etc. not only involve the coverage of the product or system, but also relate to the electromagnetic compatibility test and measurement technology.

2. Filtering

Both the input port and the output port of the solar inverter are designed with EIM filters, the purpose of which is to control EMI transmission interference, and only allow the ideal low-pass current utilization of DC and power frequency. In addition, it is a bidirectional filter, which can not only To prevent the inverter from emitting noise to the outside world, it can also prevent external interference from being introduced into the system. The filter includes X and Y capacitors and common mode inductors. The common mode inductance is on the same magnetic ring, which is composed of two windings with opposite directions and the same number of turns, so that the magnetic field generated when the flow passes through the windings is superimposed, showing a large inductive reactance to the interference current, so as to suppress the common mode mode interference, the common mode capacitor introduces the common mode current to the ground without passing through the power grid.

3. Shielding

Through various conductive materials, various types of shells are manufactured and connected to the ground to disconnect the electromagnetic noise transmission path formed by electrostatic coupling, inductive coupling or alternating magnetic field coupling of the space, and the shielding can reasonably restrain the use of Sources of interference propagated in space. There are two factors for shielding. One is to limit the leakage of the electromagnetic kinetic energy of the radiation source inside to control the leakage. The second is to prevent the electromagnetic kinetic energy of the external radiation source from entering the inside control area. The solar inverter is packaged in conductive metal such as aluminum or iron, so as to achieve the purpose of shielding.

In order to reduce the interference caused by the radiation source on the wire, a magnetic ring is usually added to the connection between the high-current wire and the input and output wires, such as the filter inductor, so as to avoid the signal interference from being transmitted outward. Isolation mainly uses components such as relays, isolation transformers, or photoelectric isolators to cut off the propagation of electromagnetic noise in the form of transmission. Its advantage is to separate the ground wire systems of the two parts of the circuit and disconnect the possibility of coupling using impedance.