1. Why does the rooftop solar inverter keep beeping?
Solar inverter beeps usually because of the following malfunctions:
1.1 Input voltage is too low
First of all, when the input voltage of the solar panel is too low until it falls below the set threshold of the solar inverter, the solar inverter will beep for warning. And this low voltage problem is mainly due to the fact that the solar panels are shaded or incorrectly oriented, which leads to low power generation efficiency of the solar panels.
1.2 Self-test warning
Generally speaking, solar inverters are equipped with self-diagnostic function, when the inverter in operation of its internal component failure or in the pre-start of the self-test problems, it will issue a beep to warn. This self-test warning is mainly due to internal component failure, high internal temperature or communication connection error.
1.3 Excessive load
Solar inverters are generally set to a maximum load capacity, and when the connected load exceeds the rated capacity of the inverter, an overload condition may occur. At this point the solar inverter will also emit a beep as a warning.
1.4 Insufficient power
In addition to inverters powered by solar panels, some solar inverters are autonomously equipped with batteries to store excess energy for later use. These solar inverters with their own integrated batteries also emit a beep when they detect that their batteries are running low. This may be due to a battery failure or a prolonged period of low-light conditions with insufficient sunlight to charge the battery.
1.5 Cable size mismatch
Suitable cable size plays an important role in ensuring the normal operation of the solar inverter. When the cable size between the solar panel and the solar inverter is not matched, it may lead to voltage drop or overheating due to high voltage. The solar inverter will also emit beeps to warn when it detects these problems.
1.6 Switching power supply modes
In most cases, the solar inverter is able to operate both off-grid and on-grid. However, when it has to switch from one working state to another, it will emit a beep sound to remind you that you need to switch its working state, which usually happens when the grid-connected inverter meets with the general power grid maintenance or failure.
2. No output voltage of solar inverter
2.1 Reasons for no output voltage of solar inverter
2.1.1 Output wire damage
The first thing we need to consider is whether the output cable of the inverter is damaged, which will lead to the solar inverter can not provide voltage to the load, so the output voltage can not be detected. In addition to the cable, damage to the jack version of the power supply may also cause the inverter to show no output voltage.
2.1.2 Incorrect setting of inverter parameters
Secondly, we need to know that when the parameters of the solar inverter are set incorrectly, it may lead to a mismatch between it and the operating parameters, thus setting off the automatic protection system of the inverter and stopping for the load function. In this case is also unable to detect the output voltage.
2.1.3 Installation problems
Finally, there is the problem of installation of the solar inverter: whether there are wires wired incorrectly or part of the wiring is not completed. Which when wired incorrectly may also lead to fire and explosion of the system.
2.2 How to fix the problem of no output voltage of solar inverter?
Repairing solar inverter without output voltage is mainly based on the following steps:
2.2.1 Check the solar inverter and its voltage output status again
First, check whether the indicator light of the inverter is on and whether the start button is pressed. If there is no problem, it is necessary to check the voltage output status of the solar inverter again in case of checking error. It is recommended that an AC voltmeter can be used to check the output voltage on the AC side of the inverter, which can better determine the fault location.
2.2.2 Checking compatibility
If none of the above checks find any problem, you can compare the basic parameter settings on the solar inverter with the instruction manual to check whether the relevant operation commands and the reference frequency match, and if it is found to be mismatched after checking, then it can be restored to the factory settings to input the commands from a new one.
2.2.3 Remove the solar inverter and reassemble it.
If the above checks do not find any problem. You can choose to dismantle the inverter and check whether the internal wiring is disconnected or loose. If you haven’t solved the problem of no output voltage of the inverter by this point, it is recommended to contact the company to provide you with more professional after-sales service.
3. How to eliminate the noise from inverter?
When the inverter makes noise, you can eliminate the noise by the following ways:
3.1 Increase cooling equipment
When the inverter generates excessive heat due to overuse during operation, it may generate noise. To prevent noise and risk of damage from its overheating, we can add external fans and radiators to it, which will reduce the noise of the inverter to some extent.
3.2 Connecting fewer loads
In general, the total power consumption of the loads connected to the inverter should not exceed the power it produces. When the load exceeds this value, it may cause the inverter to work excessively and an overload occurs. This not only generates a lot of noise but may also cause damage to the inverter.
3.3 Replacing the correct cable size
Inverters of different powers should be equipped with different sizes of cables. The performance of the solar panel and the distance between the two also needs to be considered while choosing the cable size for the inverter. The right cable can help eliminate inverter noise.
3.4 Keep the input voltage stable
Constant increase in voltage can also cause the inverter to produce noise. This largely depends on the performance of the solar panels as well as the local sunlight. However, when you can’t guarantee that the input voltage of the inverter remains stable, you can assist in installing a voltage stabilizer.
3.5 Check the battery status
When the battery of the inverter is depleted or the battery has been used for too long, this will also cause the inverter to make noise. You can check the battery condition of the inverter before considering whether you need to charge the battery or replace it with a new one.
3.6 Check the installation condition of components
In addition to the noise caused by performance problems, the loosening of the internal parts of the inverter can also cause noise. As the usage time increases, the internal parts may become loose and cause noise. For inverters that have been in use for a shorter period of time, consider whether the noise is caused by incorrect installation of the cooling fan.
4. Failure problems of solar inverter and their solutions
4.1 No power output
The main reasons for no power output of solar inverters are: disconnection from solar panels or the grid, faults in the inverter itself, wiring errors or loose wires.
In order to solve the situation of no power output from the inverter, firstly, we can check the data displayed by the solar inverter itself to determine whether there is a fault. Secondly, we can check whether the wiring status of the inverter with the total power grid and solar panels is normal.
4.2 Low power output
It means that the solar inverter is in working condition but its output power is too small to meet the needs of household loads. The main reason for this phenomenon is that the power generation efficiency of the solar panels decreases, which may be due to the blockage of nearby objects or excessive dust on the surface of the glass panels. However, it is also possible that the aging of the solar inverter leads to a decrease in its conversion efficiency.
4.3 Displaying Error Codes
When a solar inverter displays an error code, it is usually due to a fault in its internal system. The cause of the malfunction may be: the internal software system is being updated, the internal components and circuits are malfunctioning, and there is an abnormal surge of voltage.
In order to solve this fault, we can choose to disassemble the inverter and check its internal, or use a voltmeter to check the real-time voltage value.
4.4 High operating temperature
When an inverter is running too hot, we can prevent the cooling mechanism from being impeded by installing cooling equipment, placing it in a more ventilated, cooler environment, or removing dust from the cooling fan.
4.5 Ground fault
When a ground fault occurs in an inverter, parts of the solar system may become energized, and contact with energized parts may result in electrocution, injury, or death to workers. This type of fault usually occurs due to improper wiring or when the inverter is exposed to moisture and corrosion.
In order to resolve ground faults, we first need to check all the wiring in the system for damage or looseness, followed by checking the components in the solar system for water ingress or corrosion.
It is important to note that when checking for ground faults, you need to make sure you have adequate protection and disconnect the inverter from the voltage source. If you encounter a situation that cannot be solved, please directly seek help from professional maintenance personnel.
4.6 Restart failure
Generally speaking, restart failure failure of solar inverters occurs when they need to change from grid-connected mode to off-grid mode. When the total grid needs to be shut down due to faults or maintenance, the solar inverter needs to be shut down and restarted to off-grid mode, and if there is a restart failure at this time, it may prevent the solar system from operating normally.
In order to solve this problem, we need to check the firmware of the inverter whether it is out of time and unable to deal with the newly occurring unexpected situation. Secondly, we can check the functional relays inside the inverter and the related components used for the control circuits for failures. And further the faulty parts can be updated or replaced.
4.7 Isolation faults
The electrical isolation fault of the inverter refers to its inability to effectively isolate the DC power from the solar panels from the AC power it generates. This is a very serious electrical fault that can affect the performance and power generation efficiency of the solar system in a minor way, and may lead to an electrical fire or electric shock in a serious way.
In order to solve this problem, we need to check the wiring and make sure that the electrical isolation protections are functioning properly when installing a solar inverter.
