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How do I know if my charge controller is bad

Although solar PV system are very easy to maintain, it is not uncommon for people to totally ignore their existence provided they are performing their function. Due to this, some of the components might go bad unnoticed. 

Among the common components that are hard to notice when they get defective is a charge controller. So how do you tell if your solar charge controller is not working?

A charge controller main function is to protect your solar battery which is very expensive from getting damaged. If you don’t regularly check the charge controller, you might be surprised when your system is not working anymore. 

In this article, we will focus on ways you can tell if your solar charge controller is not working. We will also look on ways you can fix a charge controller that is not working properly. Stay tuned.

How do I know if my charge controller is bad?

Apart from protecting your solar battery from overcharging and discharging, a charge controller has many other benefits to your solar PV system. If your charge controller stops working without your knowledge, you might end up incurring a lot of cost replacing your solar battery. 

For the above reason, it would be better if you checked the condition of the charge controller regularly. If you notice your charge controller is not working as expected, fix the issue ASAP! But how do you know if your charge controller is bad?

Use a multimeter to test all the components

If your solar PV system is not working, it is hard to know which component is faulty. To determine which of the components is not working, detach the charge controller and battery from the solar panel. 

Measure the voltage and the current of the solar panel. If they record zero or low voltage and current when there is sunlight, then the solar panel is at fault and should be fixed.

Sometimes the battery is defective or the chargers are not enough. Use the multimeter to measure the voltage of the solar battery . If the voltage is 20% less than the nominal charge, then you should add chargers.  

Use the multimeter to measure the voltage of the charge controller. The charge controller terminal voltage should bring range. Otherwise the charge controller is faulty and should be replaced. 

How to know if my solar charge controller is not charging the battery?

A charge controller not working can cause a lot of issue like not charging a solar battery. There are a few ways you can tell if your charge controller is not working. 

  • Check the voltage of the solar battery

If the solar panel is in the right condition and there is plenty of sunlight, then your solar battery should be displaying some voltage. Suppose the battery voltage is not changing even after hours of charging, then the charge controller is faulty. 

  • Check the weather conditions

When the weather conditions do not facilitate the charging of solar batteries, then the charge controller will not pass any current to the battery. This is one way of determining why your charge controller is not working.

  • Check the wiring

If there is an open circuit between the solar panels and charge controller, then the charge controller will not charge the battery. Ensure all the wirings are done right.

Other ways of telling if your charge controller is charging or not charging your solar batteries is estimating the time taken to fully charge your solar battery. You can also observe for any error message in your charge controller. 

What to do if my solar charge controller not turning on?

Your solar charge controller might not be turning on because of the following reasons;

  • There is a loose or wrong wiring between the charge controller and the solar panel
  • The solar panel is dirty or faulty
  • The charge controller itself has an issue
  • There is no enough sunlight to charge the solar battery
  • And the solar battery is faulty

Each of the listed cases will result into the charge controller not displaying if any voltage or not working entirely. We will take each situation and give viable solutions. 

  • If there is a loose or faulty wire between the solar panel and a charge controller, use this steps to fix the issue. You can also use a user manual provided by the manufacturer to fix the wiring issue. 
  • Sometimes the solar panel might gather some dust after a long while. Check the condition of your solar panel regularly and clean it at least twice every year. 
  • A charge controller like any other device is prone to going bad. Use a multimeter to check the terminal voltage of the charge controller. If the voltage is low or zero, then your charge controller is defective and call for replacement ASAP. 
  • When there is not enough sunlight energy, then your charge controller and solar battery will not display any voltage. In such a case, you can wait until the sun is back to test if the controller is viable. Alternatively, you can use other methods of charging your solar battery.
  • A defective be solar battery cannot show and voltage or charge a charge controller. In such a case, you can replace your solar battery with a battery with the same capacity.

If the manufacturer provides a warranty, you can advantage of the warranty. 

Overall, a controller not working is like a chronic disease to your solar PV system. 

How long does a charge controller last?

The longevity of the charge controller depends on the brand of the charge controller. However, standard charge controller last between 10-25 years. 

Your charge controller will also last longer if you take good care of your solar PV system.

How to reset the solar controller?

If your charge controller is not working you can either perform a hard or a soft reset. Resetting a solar charge controller means you are returning your charge controller to factory settings mode. This means all the errors will be fixed by the time your charge controller is reset. 

Soft reset

Hold all the four buttons on the face of the controller for 15 seconds. If the charge controller is not fixed try a hard reset.

Hard reset

  • Detach all the wire cables from behind the charge controller.
  •  Let it stay for about 20 minutes before attach it back to the grid. 
  • Reconnect the positive and the negative of the battery first. 
  • Then reconnect the solar panel positive and negative. The charge controller will have gone back to factory settings. 

Resetting your charge controller should be done at night to ensure efficiency and safety. Otherwise, if you are resetting during the day, cover your solar panel with a black vinyl paper. 


If you want to enjoy using your solar PV system for long, ensure you take good care of your system.

First check if the solar panel is dirty and in the right condition. If the panel is dirty, use a fiber cloth and a cleaning liquid made for such devices. Avoiding using water and soap as they might damage your solar panel. 

Another component that should be well taken care of is a solar battery. This can be done by checking if your charge controller is working as expected. If it is not working, you can fix it by resetting or replacement. 

The guide above gives a step-by-step process of fixing charge controllers.

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