Why is the Solar charge controller blinking & flashing? How to fix it.

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The solar charge controller is an essential part of solar energy that helps in charging the system battery backup. The solar charge controller sometimes displaces blinking and flashing lights when in use. The blinking and flashing of the charge controller is what we shall look at in this article. From this article, we shall know when the controller display lights indicate normal or faulty.

Solar charge controller blinking and flashing light fault

What do we mean by solar charge controller blinking or flashing?

The blinking or flashing of the LED on the charge controller is a way the charge controller communicates on the system’s working conditions.

When the battery is too low, not charging, or fully charged the controller shows those conditions by displaying the figures or blinking of some of the controller LEDs.

Blinking and flashing of the controller LED alone don’t provide detailed information concerning the system. But the blinking sight out the statue of the system. As we proceed we shall see what the different controller displays mean.

What are the different LED displays of solar charge controllers and what do they mean?

The LED flashing blinking on the solar charge controller indicates the working condition of the solar panels, batteries, and loads on the controller.

The interpretation of the displays is explained below.

Solar panels.

The solar panel is always indicated on the solar charge controller. Once the controller senses the solar panel on the system, the PV icon and LED light up and blink for a few seconds and stop.

The controller remains down till it senses the presence of a solar panel, charging the system before it can light up and flash an LED light.

while the solar panel is charging the battery through the controller. If the power from the solar panel is too high or very low, the controller displays a red/yellow LED showing that the system is not stable.

The solar battery.

The controller blinks and shows a figure on the solar charge controller to tell the state of the batteries that are connected to the system.

The battery voltage is always shown on the display screen of the controller. When the connected battery is 12V, it will show a battery voltage of around 12.5V or 13V on the screen, when is 24V, it will show 24.5V or 25V on the controller home screen.

When the solar battery icon on the controller blinks yellow continuously. It shows that the battery is charging. When it displays a green light at the battery icon, it signifies that the battery is fully charged. But in case it blinks or displays a red light, then it shows that the battery is very low, and needs to charge immediately.

Solar loads

This is the load that is run by solar power. This type of load is different from inverter loads. Is a DC load that is connected to the solar charge controller. As the power is coming through the sun, the controller is feeding to the load.

There is an issue of overload or short circuit each time the load icon flashes on the controller screen display.

At the indicator icon of the controller load, when the light shines green, it shows that the load is operating normal

when the indicator light blinks and flashes red, it shows an overload and the system will soon enter protection mode. When the load will trip OFF.

A situation where the load light is OFF. It shows that there is no input load to the controller

How to troubleshoot and fix solar charge controller flashing and blinking light faults.

The first thing to figure out when troubleshooting solar charge controller blinking and flashing lights is to identify the blinking light icon.

The solar charge controller icons range from the load, solar panels, and battery light icons. Each of these lights displays one or two colors to show how the system is working.

Check the charge controller and find out the light icon that is blinking and what colors It blinks. Then proceed to the manual to check what the display light is all about.

when the issue is associated with a low battery, you can remove the load on the system and allow it to charge for like 24 hours. After that connect the load back and the fault will clear.

If there is an overload issue. Just remove some of the connected load on the controller and the overload light issue will be cleared.

If the light is showing no panels, during the day. Test the solar panel wires using a multimeter to know if is supplying voltage. If is not, then troubleshoot the panel wiring connection and make sure they are connected well.

Safety guide when using a solar charge controller.

Below are the safety measures to keep why using a solar charge controller so you can enjoy the optimum performance. Adhering to the following instructions will make your system function well and keep it safe too.

Always study the user manual of the solar charge controller. This will help you to understand more of its features and different LED displays.

Maintain the operation temperature of the controller during operation. Don’t install them in a moist and dusty environment.

make sure the solar controller is appropriately installed with the right cable sizes as stipulated in the manual.

Avoid overloading the charge controller with output load or input loads. Check the controller displays from time to time to make sure everything is working effectively.


The blinking and flashing of light on the solar charge controller can be caused by many reasons which were stated clearly in this article. Most time it way of showing the status of connected devices like solar panels, batteries, or DC loads

The article suggests a way to troubleshoot and fix the controller light blinking and flashing which will help you to fix your devices.

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