How to solve the problem that the red light of inverter is on and the green light is not on?

‍When the inverter is in use, the red light turns on and the green light turns off, which is a typical performance of the trigger protection mechanism of 

the equipment. In most cases, the hardware is not damaged, and the problem can be quickly located and the operation can be resumed through step-

by-step investigation. Below we will explain the corresponding reasons and solutions one by one according to the probability of occurrence from high 

to low.

The most common is the trigger protection of abnormal input voltage, which generally shows that the red light is always on, the green light is not on, 

and the equipment has no AC output. This is because the DC input voltage is beyond the normal working range of the inverter. Too high or too low 

will trigger overvoltage and undervoltage protection. For example, the battery is deeply out of power, the battery voltage model does not match the 

equipment, and the front-end rectifier input voltage exceeds the standard. The solution is also very simple. Measure the actual voltage at the DC input 

end of the inverter with a multimeter and check the rated input range of the equipment. Under-voltage, recharge or replace the matching battery in time, 

over-voltage, adjust the front-end input power supply, and restart the equipment after eliminating abnormal voltage, and most of them will return to normal.

The second high frequency reason is output overload or short circuit. If the red light turns on and the green light turns off when there is a load, and it can 

return to normal after the load is removed, it can basically be judged that it is a load problem. The total load power exceeds the rated power of the inverter, 

or the output line and load are short-circuited, which will trigger over-current and short-circuit protection; Especially for inductive loads such as refrigerators 

and compressors, the instantaneous impact power can reach 3 to 5 times of the rated value, and it is easy to trigger overload protection instantly. Unplug 

all output loads and restart the inverter. If the green light returns to normal, the equipment itself is fine, and then connect the equipment with load 

positioning problems one by one. For daily use, it is suggested that the total load should be controlled within 80% of the rated power, and multiple inductive 

loads should not be started at the same time.

The third situation is overheating protection shutdown, which usually shows that the red light turns on and the green light turns off after running for a period 

of time, and it can work normally after shutdown and cooling. In this case, most of the cooling holes are blocked by sundries, the ambient temperature is too 

high, and the fan is blocked by dust, resulting in the internal temperature exceeding the protection threshold, and the equipment automatically stops to protect 

itself. In this case, immediately turn off the power, check whether the air inlet and air outlet of the equipment are unobstructed, and clean up the surface dust 

and filter debris; Move the equipment to a ventilated and cool place, and restart it after the internal temperature drops sufficiently; If it is used in high 

temperature environment for a long time, it is recommended to run it at a reduced rate.

Another situation that is easy to ignore is that the polarity of DC input is reversed. Generally, the red light is on directly after the power supply is connected, 

and the equipment has no output at all. This is because the positive and negative poles of the DC terminal are connected reversely, which triggers the reverse 

connection protection of the inverter. At this time, the power should be cut off immediately, and the positive and negative poles should be rechecked according 

to the terminal identification of the equipment, and then the machine can be turned on after the correct wiring. Repeated reverse connection will easily cause 

equipment damage.

If all the above situations are checked one by one, the red light is always on and the green light is not on after restarting the equipment, and there is no output, 

there is a high probability of internal hardware failure, such as internal fuse blowing, power device damage and abnormal control circuit. In this case, it is not 

recommended to disassemble the machine and repair it by yourself. You should contact the brand for professional testing and maintenance after sale.

Generally speaking, the red light and the green light of the inverter are not on, and most of them are the protection mechanisms that are active, the essence of 

which is the protection of equipment and back-end loads. The occurrence of this kind of situation can be greatly reduced by standardizing wiring, reasonable 

loading and keeping the heat dissipation unobstructed in daily use. Baoweite full series pure sine wave inverter comes standard with six protection mechanisms 

of over-voltage, under-voltage, over-current, short-circuit, overheating and reverse connection, which can automatically trigger protection under abnormal working 

conditions to ensure equipment safety to the greatest extent; The fault state is clear and identifiable, and the investigation is simple, and the use of industrial and civil scenarios is more worry-free.

If you need type selection and transformation, you can consult Baoweite for the scheme. Thank you for browsing. You can collect official website of 

Shenzhen Baoweite Power Supply Co., Ltd.