If your inverter keeps switching on and off then you might start wondering if it is because of some damage. But you need not to worry. In this article, we will elucidate all the possible reasons for this situation and how to tackle them.

Why Inverter Keeps Switching On and Off?

Why my inverter is switching on and off every second? A specific quantity of power can be handled by a solar inverter. It will turn off automatically if it goes over that threshold. This is carried out as a preventative measure to safeguard the inverter and prevent it from overheating. It’s critical to identify the cause of your inverter’s frequent shutdowns and take action to resolve the issue. It could be harming your equipment and endangering your home if you simply continue restarting it without identifying a solution. 

Let’s examine the most frequent causes of why your inverter keeps switching on and off every second.

1. Too High Voltage

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The level of voltage is above the permitted level, which is the most likely cause. Such systems have a voltage restriction regardless of the inverter size. The security trigger mechanism is triggered when the upper limit is reached. 

There are numerous causes for a surge in voltage. Most likely, an inverter phase is already set to its maximum voltage, or the voltage is actually above 240 volts. Make sure it is not surpassed. The voltage’s maximum limit is described in the operation manual. 

2. Solar Power Insufficiency

A solar system’s linked inverter relies on its solar panels for energy. The inverter will automatically switch off  when there is no sufficient sunlight for the panels to create the electricity needed to operate. Sometimes we forget to consider this reason when our inverter keeps switching on and off. 

If the inverter is linked to the solar panels, this may occur on cloudy or chilly days. When there is sufficient electricity, the inverter will operate without issue. 

Summer solar power supply shouldn’t be a problem. You can use electricity to power the inverter if you are connected to the grid. Install an energy bank instead if you live off the grid, so the inverter has a reliable power source.

Also Read: Solar Panel Inverter Humming Noise Causes and Solutions

3. Grid Power Supply Outage

During a grid power cut, the inverter must be turned off to prevent AC from being sent into the grid and threatening the professionals who are repairing the grid supply.  

By determining the grid’s voltage as well as frequency and modifying the AC produced to match, the inverter continuously detects the existence of grid electricity. To demonstrate that it may shut off in the case of a power outage, the inverter needs to be UL bona fide.

4. Inadequate Cable Size

Solar cables wiring

The inverter cable needs to have the correct size in order to function, similar to solar panels and batteries. For best results, inverters wires should be as thin and brief as possible. If your inverter is powered by a battery bank, the wires must carry the current. Resistance is produced by long, thin cable wires, and the further the current must travel, the greater amount of power is lost. 

An inverter loses less energy during the converting process while using shorter or thicker AWG cable gauges. There may not be enough power to activate the inverter because of the loss caused by long wires. Both too much and too little power (high voltage) are detrimental to the inverter. 

For a complete idea of cable sizing, take a look at our blog – Solar Cable Size Selection Guide For PV Plants.

5. Inverter Internal Failure

Internal failure might cause problems that could lead to the inverter switching on and off. When turned on, the inverter will perform a self-test sequence to detect unusual input circumstances or an overload on its output side. The problem code is displayed on liquid crystal screens that are installed in modern inverters. 

An error mode is denoted by a red LED and is accompanied by a beeping sound. Most of these problem warnings can be fixed by the user, but if the inverter breaks, it will need to be fixed or replaced.  

Also See: How to Read Solar Inverter Display

6. Inverter’s Inaccurate Parameters

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Due to wrong specifications, inverters can potentially turn off or restart frequently. The configuration options unique to each inverter can have an impact on performance. The settings have been set up during installation; unless there is an issue, it is usually advisable to leave them alone. The settings can always be changed but picking the incorrect one can lead to issues. 

Use only those settings advised by the manufacturer for safety reasons. If you wish to test another option, speak with the installer to make sure it is secure; if not, make sure the documentation permits it. 

7. Overload 

The inverter’s shutting down is most likely caused by an overload on the alternating current side of the inverter.  

Verify that the combined power demand of all the connected appliances does not go over 80% of the inverter’s maximum rated output. 

To get rid of the overload issue, check out how to reset inverter overload.

 8. Inverter Keeps Tripping

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It’s crucial to try to identify the reason why your inverter is tripping. The most frequent reasons include a power surge, a short circuit, a power overload that exceeds the inverter’s capacity, and manual electrical resets. 

After analyzing why my inverter is switching on and off in every second, let’s know all the causes of the inverter’s tripping in detail. 

  • The inverter could trip the circuit’s breaker if the electrical demand is too high. Minimize the load by shutting off any unused appliances or lighting to prevent this. 
  • Check your wiring next. Make sure the wires are firmly connected and adequately insulated.
  • Additionally, if your inverter is outside, it’s crucial to keep the space around it free of debris because this could be the source of an overload. 
  • Inspect the voltage levels if the connections and power load appear to be in good shape. The inverter may trip due to faulty voltage levels or a broken battery.
  • It’s crucial to speak with a trained expert for a more thorough evaluation if you have any suspicions that this might be the problem. 
  • A faulty inverter element or loose connections could be one factor. It’s possible that if you have installed or modified your solar system, the new components need a larger capacity than the inverter can offer. 
  • To identify the cause of the trip, you can consult the manual for instructions, reset the inverter, or verify that all parts are correctly placed and wired. 

Also Read: Sungrow Inverter Problems, Fault Codes, and Solutions

Other Possibilities Of Tripping are:

A. If the inverter doesn’t function after performing these simple checks, it’s likely past the point of no return and might require to be replaced. The age of the inverter could be a crucial reason that could lead to dysfunction and inverter switching on and off.  

B. Another possibility is that the level of quality of the source of your energy, such as your electricity provider, falls short of what is required for an inverter to operate smoothly. Finally, think about having an expert inspect the system if the underlying cause of the inverter’s trip is not readily apparent. 

C. Another frequent issue is that the inverter enters the power reduction mode rather than disconnecting. When the voltage is not quite sufficient to trip the inverter, this occurs. Your inverter may go into ‘volt-watt response mode’ to limit its power output in order to cope. 

Realize that your system isn’t acting in this way randomly. These safeguards were created to protect your grid and prevent any potentially hazardous circumstances that could arise from overly high voltage. 

To further understand the issues and faults, go through these 32 Troubleshooting Solar Inverter Problems and Solutions.

Why Your Solar Inverter Keeps Restarting?

Solar Inverter Problems and Solutions

You should not ignore it if your inverter keeps restating. We have examined the reasons for the inverter’s frequent switching on and off. Here are some of the main reasons why your inverter keeps restarting. 

1. Overheating 

Inverters typically shut off when their temperatures reach risky levels or when they malfunction. Once it turns off, it won’t be reactivated until it completely cools down. There is a certain impact of the ambient temperature on the efficiency of inverters.

So, check to see whether the inverter might be overheating. If so, check to see if it is ventilated adequately. Additionally, ensure that it is positioned in a cool, dry area, out of reach of any heat sources, particularly direct sunlight, or else it may shut down. 

2. Battery Drain Condition

When an appliance is turned on, a considerable voltage drop results in a large current drain from the battery, which sets off the inverter’s low battery termination condition. Tracking the minimum battery voltage can help verify whether a battery drain condition is indeed triggered.  

Check that your battery is fully charged. Make sure that the inverter’s battery setup is adequate to withstand the sudden power drain of the linked appliances, taking into account wire diameters and battery capacity.

Also See: What to Do When Inverter Battery is Fully Charged?

3. Wire Fault 

An irregular fault in the wiring or a malfunctioning appliance can cause the inverter to switch off due to an overloaded fault situation. If an inverter shuts off when a device is shifted or there is a burning smell nearby, there may be a problem with the wires. 

Replace any faulty appliances or cables with new ones. See if this stops your inverter from continually shutting down or starting up. 

4. Faulty Inverter 

It’s possible that the inverter is broken. It could be an issue with the inverter if you’ve checked and verified that it’s adequately ventilated, that the cables for the battery and capacity are correct, and that the battery is fully charged. 

Plan to have the inverter fixed or replaced with another.

Cross-Reference: Soft restarting of industrial power network using inverter-controlled energy storage system 

Do Solar Inverters Turn Off at Night?

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Now you are familiar with all the reasons why your inverter keeps shutting down or keeps restarting, but do solar inverters turn off at night or not?  

The direct current power created by solar panels is converted into alternating current by a solar inverter in a solar energy system. The solar panels cannot generate photons since there won’t be any sunlight at night, hence no power will be produced. As a result, all the inverters are cut off automatically when the sun sets and solar panels are no longer producing electricity. Additionally, check out how to switch off inverter when not in use.

In this article, we’ve covered why your inverter keeps switching on and off as well as fixes for the issues. However, if your inverter still isn’t functioning properly, we advise you to consult an electrician. To uncover more intriguing topics, please continue to explore our website.

Recommended: SolaX Inverter Review – Is It Worth It?


Olivia is committed to green energy and works to help ensure our planet's long-term habitability. She takes part in environmental conservation by recycling and avoiding single-use plastic.

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