Solar Charge Controller No Load Output | What to Do?

The generated electricity by solar panels needs to be managed carefully to ensure its efficient storage and utilization. In this case, solar charge controllers play a crucial role. It regulates the charging process and prevents overcharging or discharging of batteries.

However, a common issue with solar charge controllers is the “no load output”. It happens if there is no voltage found on the load output of the solar charge controller.

If you are facing the same problem with the load output of your solar charge controller, this article is just for you. In this guide, we’ll explore the reasons for solar charge controller has no load output and explain how to fix this issue.

Let’s get started below!

solar charge controller no load output

Why Is Solar Charge Controller No Load Output?

You may already know that some solar charge controllers come with a load output feature that can control the load manually or automatically. It provides a small output voltage from the solar charge controller to power small loads such as small DC appliances and DC bulbs.

The voltage on the load output of the solar controller is normally lower than the voltage required by some load appliances. While some load appliances may require around 120V or 240V, load output provides around 10V to 20V.

However, if there is no load output on the charge controller, then there can be a few reasons. Here are they –

  1. If the solar battery doesn’t have enough charge.
  2. If the condition of the charge controller isn’t good.
  3. If the manual switch of the charge controller is turned off.
  4. If the battery voltage drops below the minimum amount of voltage that is pre-set on the charge controller to disconnect the load output.
  5. If the charge controller is rated 25% more than the amps of the solar panels.
  6. Problem with the fuse or breaker at the battery (+) terminal.

You need to check everything mentioned here to find out the exact reason and fix that.

How to Fix Solar Charge Controller No Load Output?

If you are having trouble with how to use the solar charge controller load output terminal, you can check the manual provided by your solar energy system manufacturer. But if the issue persists, then try the solutions below.

  1. Turn on the Solar Charge Controller: Check if the manual On/Off switch of your solar charge controller is turned off. If it is turned off, then turn the switch On. You can also check the programming on the controller load output terminal and ensure it is turned on.
  2. Ensure the Proper Battery Voltage: Check the voltage of your solar battery and make sure that it is higher than the charge controller voltage.
  3. Maintain the Amps: Make sure to have at least 25% more amps than the solar panel on the charge controller.
  4. Check the Fuse/Breaker: Check the fuse or circuit breaker at the battery (+) point and make sure it is rated properly.
  5. Try Automatic Switchable Load Output: Check the documentation of your charge controller to see if the load output is switchable manually or automatically. If it has a manual switch, then try a solar charge controller with load output terminals that can switch automatically to provide power to charge batteries.

In this way, your solar panel will always provide maximum power output for charging solar batteries.


All the possible causes why there might be no load output on the solar charge controller of your solar panel are explained above. We hope, now you know why you are getting no load output and what you need to do to fix it after reading this article. For further assistance regarding this topic, don’t hesitate to ask in our comment section below. Thanks for reading!

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