Solar Panel Not Charging Battery | [6 Reasons & 7 Solutions]

Let’s pretend you’ve invested in a solar panel and hooked it up to a battery. When you go back, the solar panel hasn’t done a thing. Sound familiar? One typical issue is that your battery isn’t fully charged due to insufficient sunlight.

Incorrect solar panel installation, malfunctioning equipment, a defective battery, or problems with the solar charge controller are the most common causes of a solar panel’s inability to charge a battery. Changing out the broken parts is the quickest and most straightforward solution.

With this ultimate guide, you can ensure at the end of this article; you’ll have plenty of information regarding the causes and fixes of your solar panel. Without further do, let’s get started.

How to Properly Check If solar Panel Is Charging Battery?

A malfunctioning solar battery, improper wiring, defective solar panel, or incorrect solar charge controller settings are likely responsible if the solar battery fails to charge.

The first step in treating a condition is pinpointing what it is. Let’s discuss measures to detect whether the solar panel is charging a battery.

  • Step 1: Get a multimeter and plug it into your setup in sunlight. It will help in measuring panel voltage. 
  • Step 2: Check the voltage of your battery. It should have a balanced temperature.
  • Step 3: Let’s move on to the solar controller. Test the voltage at its terminals. Again it’s essential to maintain a safe terminal voltage. 
  • Step 4: Make sure you have rechecked your tools. All components must be examined twice, including the regulator, alternator, solar panel defects, battery, charge controller, and panel.
  • Step 5: Observe your surrounding conditions. Make sure the solar panel is installed correctly and is towards the sun.

Ensure your solar panel isn’t being blocked by obstacles and is getting more than enough sunshine since this will help the system run more efficiently. 

Setup Guide

Source: YouTube/Website Learners

A solar panel can charge your battery; here is a brief tutorial on getting it set up correctly.

  • Step 1: The first thing you need to do is link your solar charge controller and battery. Ensure the panel is not connected until after you finish your work.
  • Step 2: Double-check that the positive and negative poles are connected appropriately. 
  • Step 3: Measure the solar panel’s voltage when it’s exposed to sunlight. The solar panel’s voltage must be higher than the battery’s.
  • Step 4: Connect the Solar Panel to the Solar Charge Controller

If you followed Steps 1 through 4, your Solar Charge Controller should now show that the battery and panel have been connected.
Likely, you won’t have issues if your system is configured correctly and your equipment is high quality. 

Reasons Why Solar Panel Is Not Charging Battery?

If the solar panel is not charging the battery, try cleaning it well and placing it where it will get plenty of sunshine. Before reinstalling the solar panel, make sure that all of the connections are secure.

Some of the more frequent ones are explained in further depth below.

Weather Effects

Reduced solar absorption will occur if there is no sunlight for an extended period, and the output voltage may be too low to charge the battery.

Defective Solar Panel

Your solar panel can be broken, which is one of the leading causes. Therefore,  it can’t supply enough power to recharge your battery fully. Some typical solar panel problems are listed below.

  • The weird Pattern: There is a high risk of cracked panels. And that means water will eventually creep inside. Consider the sun as well. As a result, A chemical reaction can make strange patterns on your solar panel.
  • Bad Quality Panel: An outdated or low-quality panel is likely to fail anytime. Therefore, issues like a dead battery might result from low-quality solar panels.
  • Appearance Of Hot spots: Observing your panel closely, you will notice that a portion of it is covered by darkness. Since the temperature is higher there, a hotspot can form. As a result, the solar module and grid line will sustain damage, and your solar panels will be less functional.
  • Cracks Appear at Panel: The hidden damages can be caused by outside forces and, seen with the naked eye, are responsible for power output and other mechanical problems.

Defective Solar Charge Controller

An issue may arise with your solar Charge Controller. Your battery won’t be charged in that situation. This is a common issue with cheap charging controllers.

Several issues can arise with a Solar Charge Controller that can prevent it from charging the battery, such as a moon error signal, a frozen display, or a lack of power. In that case, replacement of the charge controller is sometimes required due to damage.

There is also the risk that you will screw up your solar charge controller’s settings. Be careful not to alter any mysterious options on your high-tech Solar Charge Controller.

Faulty Battery

We are moving on to battery now. A damaged solar battery cannot be recharged. However, Charging the battery pack as a whole will fail if even one of the batteries is affected. The best solution is to find the defective battery quickly and replace it.

Remember: Don’t use the Solar Panel to charge batteries that aren’t compatible with it.

  • Low-voltage battery protection: It is challenging to recharge a dead battery using only the sun. Locate the battery with the lowest voltage and use a high-current charger and battery balancer for battery protection.
  • Batteries are fully charged but draining quickly: The reason can be low battery service. Solar batteries should be changed after every 2 to 3 years. When a battery is short-circuited, it loses capacity and may be permanently damaged.

Inaccurate Setup

You will have a non-functioning system if you don’t correctly set up the Solar Panel, Charge Controller, and Battery. Incorrectly connecting solar panels to batteries is a common problem during installation.

A solar controller should be used to maximize the benefits of solar energy. Misconnecting the positive and negative poles falls under the “wrong setup,” which eventually leads to the solar panels not getting charged.

Damaged Equipment

Damage equipment can be why your solar panel is not charging the battery. A faulty inverter or charge controller is most likely to blame. Of course, remember that other things might be broken as well.

It is also essential to verify the condition of your regulator. Be careful to double-check everything associated with the battery charging. 

How to Fix Solar Panel Battery Charging Issues

Source: Welterelectric

Hopefully, you can now see the root cause of these annoying issues. If your batteries aren’t charging, you may need to replace them. You can get the equipment fixed, relocate to a more solar-friendly location, raise the booster, or connect several solar panels in series can be the solution for solar batteries not charging.

It’s time we figured out how to quickly and efficiently address these issues mentioned above. It is exactly what we’ll be talking about in detail below.

Make Sure Solar Panel Is Facing Toward Sun

The solar panel gets its power from the sun, as its name implies. Most solar panels fail to charge because there is not enough sunshine sprinkling on them.

So, it needs a substantial amount of sunlight to charge correctly. If there isn’t enough light, it won’t matter how well your solar panels are connected; they won’t charge.

Fix Damaged Solar Panels

There is a high chance of broken solar panels. t might be due to a lack of maintenance, harsh weather, or a manufacturing flaw.

You can do nothing alone if you have problems, such as broken solar cells, hotspots, bad-quality, or cracked solar panels. t that moment, you have to replace them.

Replacing A Dead Battery

Always treat your batteries with care, and never go for cheap ones. Additionally, don’t try to charge batteries that aren’t compatible with one other.

To let your battery sit idle for extended periods is a significant concern. After that, utilizing the solar panel to charge the battery becomes problematic. If the battery voltage is low, you should charge it with a current charger.

The last option for a damaged battery is to replace it.

Solar Charge Controller Issues

When the solar panel shows an error sign or no power, it prevents the battery from being charged. If the solar panel isn’t charging the battery, restarting it will fix the problem. Resetting can occur in two different ways. Separately, they can be somewhat hard and relatively soft. 

A soft reset is usually sufficient. Try a hard reset if that doesn’t seem to be working. Don’t forget that resetting the solar charge controller is a common choice if your solar panel isn’t charging the battery.

Reinstall Solar Panel

Maintenance of the solar panels and cables may be necessary after prolonged use. You’ll need to reset your Solar panel for that. In this way, you can rest assured that your connections are secure.

To do this, you must follow these instructions:

  • Unplug the cables and check for incorrect or loose wiring
  • Check the end of the wire for any obstruction or residue
  • Examine the damages in panels.
  • After you’ve ensured everything is in working order, you may reconnect the solar panel.

Your solar panels may be removed or repaired with as little effort as unbolting them from their mounting system and disconnecting the power connections.

Replace Or Repair Solar Panel

If you reinstall your panel and still the problem is not solved, you can repair or replace your panel.

If the Solar panel is physically damaged, it must be replaced immediately. If the solar panel is in good condition and there is hope for recovery, that is also an excellent option. You can accomplish this by calling the company’s customer care or contacting a local dealer.

Before replacing the solar panel, make sure you perform the other checks stated in the post.

Contact Customer Service

If you want to upgrade or replace your solar panel, contact customer support to find the best option. You may also request a service call or email to check your solar panel by a professional. You can contact the customer service representatives anytime with questions or concerns.

They will forward you to the relevant department if a question falls outside their context. The majority of the commonly asked questions that customer support staff gets are answered in FAQ. The person can benefit from them, which helps in solving the problem.


Constantly having to replace dead batteries is a significant pain. Luckily, it’s solvable if you know what to look for in your panel, how to diagnose the problem, what causes it, and how to fix it, just as we did earlier. Learning it will not only solve your current issue but also help you avoid similar complications in the future.

Do not inspect the solar panel, as an untrained individual may harm the panels or the wiring if all the preceding measures are followed, and the problem continues. Then it would be best if you got in touch with the service’s support staff.


How often do solar panels need to be replaced?

Most solar panels have a 25- to 30-year lifetime, which is the industry standard. The standard guarantee period offered by dependable manufacturers is 25 years. However, the solar batteries should be changed after every 2 to 3 years.

How frequently do solar panels need maintenance?

The average lifespan of a solar panel is 25 years, and they only need to be serviced two to four times a year. Panels might need cleaning after winter when dust and dirt have accumulated, so these projects are best tackled in the fall and spring when the weather is milder.

If a battery is dead, can a solar panel charge it?

If the battery is dead, the Solar Charge controller won’t be able to charge it. Therefore, you’ll need to use a separate battery charger before connecting the battery to the solar panel.

Ahmad Ghayad

Ahmad Ghayad is the Creator of, a website created to help people build and understand how solar power systems work. He is a passionate Mechanical Engineer that worked in the building and maintaining several solar power systems for houses and organizations during a severe domestic power outage in his country.

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