What Happens If Your Solar Inverter Fails? Signs to Look For and What to Do Next
Your solar panels are still on the roof. The sun is shining. But your monitoring app suddenly shows little or no generation.
Or perhaps you’ve noticed your electricity bills creeping up despite nothing changing in your home.
Maybe your inverter has started flashing a red warning light or displaying an error code you’ve never seen before.
If you’ve found yourself asking, “Has my solar system stopped working?”, you’re not alone.
The good news is that in many cases, your solar panels aren’t the problem. More often than not, if something goes wrong with a solar PV system, the inverter is the first place to look.
Because the inverter is the hardest-working component in the system, it’s also the component most likely to need attention during your solar system’s lifetime.
In this guide, we’ll explain the most common signs that your solar inverter may be failing, what those symptoms actually mean, what you can safely check yourself, and when it’s time to call in a professional.
What Does a Solar Inverter Actually Do?
Think of your solar inverter as the brain of your solar PV system.
While your solar panels generate electricity in the form of direct current (DC), your home uses alternating current (AC). The inverter converts that electricity into a form your appliances can actually use.
Modern inverters do much more than simply convert electricity too. They also:
- Monitor how much electricity your system is producing.
- Communicate with your monitoring app.
- Manage battery charging (if you have battery storage).
- Continuously monitor the safety of the system.
- Disconnect the system if unsafe grid conditions are detected.
Without a working inverter, your solar panels may still be generating electricity—but your home can’t make use of it.
The Most Common Signs Your Solar Inverter Is Failing
Solar inverters rarely fail without warning. In many cases, there are several signs that something isn’t quite right long before the inverter stops working altogether.
1. Your Solar Production Suddenly Drops
One of the earliest warning signs is a noticeable reduction in electricity generation.
Perhaps your system normally produces 20kWh on a sunny spring day, but suddenly it’s only producing 8kWh under similar weather conditions.
Before assuming the inverter has failed, it’s worth checking for other possible causes such as:
- Heavy dirt or debris on the panels
- New shading from nearby trees
- Unusually poor weather
- Snow or leaves covering panels
If none of these apply and your generation remains much lower than expected, the inverter could be struggling to convert electricity efficiently.
Potential causes include:
- Ageing electronic components
- Internal hardware faults
- Overheating
- MPPT (Maximum Power Point Tracking) issues
- Damaged connectors or wiring
A sudden drop in generation is always worth investigating sooner rather than later.
If you want to learn more about checking if your panels are working properly, click here.
2. Your Inverter Shows a Red Light or Error Code
Most modern inverters constantly monitor themselves and will alert you when something isn’t right.
Depending on the manufacturer, you may notice:
- Red warning lights
- Flashing LEDs
- Audible alarms
- Error codes on the display
Common messages include:
- Grid Fault
- Isolation Fault
- Ground Fault
- DC Over Voltage
Don’t panic if you see one of these messages—but don’t ignore it either.
The best approach is to:
- Take a photo of the display.
- Write down the error code.
- Contact your installer for advice.
Avoid repeatedly resetting the inverter in the hope the message disappears. While it may temporarily restart, the underlying issue is unlikely to have gone away.
3. Your Monitoring App Stops Updating
This is one of the most common reasons homeowners think their inverter has failed.
Fortunately, it often hasn’t.
Sometimes the monitoring app simply loses its internet connection.
Possible causes include:
- Wi-Fi problems
- Router changes
- Broadband outages
- Cloud server issues
If your inverter display still shows normal generation but your app isn’t updating, the problem is likely with communication rather than the inverter itself.
However, if both the app and the inverter display show little or no generation, it’s much more likely there’s an issue with the system itself.
4. Your Inverter Keeps Turning Off and Back On
Solar inverters should run consistently throughout the day.
If yours repeatedly shuts down and restarts, that’s a clear sign something isn’t operating correctly.
Possible causes include:
- Internal component failure
- Grid voltage fluctuations
- Software faults
- Overheating
- Age-related wear
Intermittent faults can be particularly frustrating because the system may appear to fix itself temporarily before failing again later.
5. You Hear Strange Noises
Most inverters are almost silent during normal operation.
Some models contain cooling fans, so a gentle fan noise is perfectly normal.
However, you shouldn’t hear:
- Loud buzzing
- Continuous clicking
- Electrical humming
- Crackling sounds
New or unusual noises often suggest that internal electrical components are under stress or beginning to fail.
If the noise is persistent, it’s worth arranging a professional inspection.
6. The Inverter Feels Extremely Hot
It’s perfectly normal for an inverter to become warm while it’s working.
It isn’t normal for it to become excessively hot.
Common causes of overheating include:
- Poor ventilation
- Direct sunlight
- Dust blocking cooling vents
- Cooling fan failure
- Internal electrical faults
If the inverter repeatedly overheats, it may automatically reduce performance or shut itself down to protect its internal electronics.
Over time, excessive heat can significantly shorten an inverter’s lifespan.
7. Your Electricity Bills Suddenly Increase
Sometimes the first sign of a failing inverter isn’t on the inverter itself.
It’s on your electricity bill.
If your system quietly stops generating electricity, your home simply imports more electricity from the grid instead.
Many homeowners don’t notice anything unusual until their next bill arrives.
If your bills suddenly increase despite similar energy usage, it’s worth checking your solar production history.
8. Your Solar System Stops Producing Electricity Altogether
The most obvious sign is when generation drops to zero.
This doesn’t always mean the inverter has permanently failed.
Possible explanations include:
- Grid outage
- Internal fault
- Blown fuse
- Isolator issue
- Failed inverter components
- Safety shutdown
Although complete shutdowns can sometimes have relatively simple causes, they always require investigation before restarting the system.
Think Your Inverter Might Be Failing?
If you’re unsure whether the issue is your inverter, your solar panels or another part of the system, JD Allen Solar can help diagnose the problem and explain the most appropriate solution.
In many cases, faults can be identified quickly, avoiding unnecessary replacements and getting your system back up and running as soon as possible.
If you’d like immediate support from a professional solar panel installer based in South London, you can contact us here.
Can You Tell If Your Inverter Has Definitely Failed?
Not always.
One of the biggest misconceptions is that every warning light means the inverter has reached the end of its life.
In reality, many faults are temporary.
Examples include:
- Internet connectivity problems
- Temporary grid voltage fluctuations
- Software updates
- Loose communication cables
- Brief safety shutdowns
On the other hand, repeated faults, internal hardware failures or ageing electronics may mean replacement is the most sensible option.
The only way to know for certain is through proper fault diagnosis.
What Should You Do If You Think Your Inverter Has Failed?
If you suspect something isn’t right, there’s a sensible order to follow.
1. Check Your Monitoring App
Has generation genuinely dropped?
Or has the app simply stopped updating?
Compare today’s production with previous sunny days if possible.
2. Look at the Inverter Display
Check for:
- Warning lights
- Error codes
- Fault messages
- Generation readings
Take photos before doing anything else.
3. Check Your Consumer Unit
Occasionally a breaker may have tripped.
Unless you’re confident working with electrical systems, don’t begin resetting switches without understanding why they’ve tripped.
4. Don’t Keep Restarting the Inverter
It can be tempting to repeatedly switch the inverter off and on.
If there’s an underlying hardware problem, this won’t fix it and may make diagnosing the fault more difficult.
5. Contact Your Installer
Your installer already understands how your system was designed and can often identify the issue quickly.
If your original installer is no longer trading, an experienced solar maintenance company should be able to diagnose and repair the system.
Can a Faulty Inverter Damage Your Solar Panels?
Generally, no.
Solar panels themselves are incredibly reliable and are designed to last 25 years or more.
However, leaving inverter faults unresolved can lead to:
- Lost solar generation
- Reduced electricity bill savings
- Missed export payments
- Longer system downtimes-if-your-solar-inverter-fails
- Potential stress on other electrical components
The sooner the fault is identified, the less energy you’ll lose.
How Long Do Solar Inverters Usually Last?
Unlike solar panels, which often continue producing electricity for 25–30 years, inverters have a shorter expected lifespan.
Typical lifespans are:
- String inverters: around 10–15 years
- Microinverters: often 20–25 years
- Power optimisers: typically 20–25 years
Click here to learn more about the different types of inverters.
Replacing an inverter during the lifetime of a solar system is completely normal and something many homeowners will experience once.
The good news is that newer inverter technology is often more efficient, quieter and includes better monitoring software than systems installed a decade ago.
Should You Repair or Replace Your Inverter?
The answer depends on the cause of the problem.
Repair may make sense if:
- The inverter is still under warranty.
- The fault is isolated to a replaceable component.
- The unit is relatively new.
Replacement may be the better option if:
- The inverter is over 10 years old.
- It has developed multiple faults.
- Spare parts are no longer available.
- A newer model would improve efficiency or monitoring capabilities.
A good installer will recommend the option that makes the most financial sense rather than automatically suggesting a replacement.
JD Allen’s Perspective
One of the biggest mistakes we’ve seen homeowners make as solar panel installers in South London, is either panicking or ignoring the problem completely.
A flashing warning light doesn’t necessarily mean your inverter has reached the end of its life, but equally, continuing to leave a fault unresolved could mean weeks or even months of lost solar generation.
Our approach is always to diagnose the actual cause before recommending any repair or replacement.
Sometimes it’s a simple communication issue.
Sometimes it’s a grid-related fault.
Sometimes the inverter genuinely has reached the end of its service life.
Every system is different, which is why proper diagnosis always comes first.
Final Thoughts
Solar inverter failures are relatively uncommon, but they’re not unusual.
As the hardest-working component in your solar PV system, your inverter will eventually experience wear over time. Fortunately, most problems give warning signs before complete failure occurs.
If you’ve noticed lower generation, warning lights, unusual noises, repeated shutdowns or rising electricity bills, don’t assume the problem will resolve itself.
Acting early can minimise downtime, protect your savings and help keep your solar system performing as it should.
Need Help Diagnosing a Solar Inverter Fault?
If you think your solar inverter may be failing, JD Allen Solar can help.
Whether it’s a simple fault, a warranty issue or an inverter replacement, we’ll diagnose the problem, explain your options clearly, and help get your solar system back to generating electricity as efficiently as possible.
Click the button below to get in contact with us now.
FAQs
How do I know if my solar inverter has failed?
Common signs include a sudden drop in solar generation, warning lights, error codes, unusual noises, repeated shutdowns or your monitoring app showing little or no electricity production.
Can a faulty solar inverter be repaired?
In many cases, yes. Newer inverters with isolated faults can often be repaired, particularly if they’re still under warranty. Older units with major internal failures are often more economical to replace.
How long does a solar inverter usually last?
Most residential string inverters last between 10 and 15 years. Microinverters and power optimisers are generally designed to last 20 to 25 years, similar to the lifespan of the solar panels themselves.
Should I reset my solar inverter if it shows an error?
It’s usually better not to repeatedly reset an inverter without understanding the cause of the fault. Make a note of any error codes and contact your installer, as repeated resets can hide underlying problems.
Who should I contact if my solar inverter stops working?
Your original installer is usually the best place to start, as they’ll already be familiar with your system. If they’re no longer trading, an experienced solar maintenance company like JD Allen Solar can diagnose the fault and advise whether a repair or replacement is needed.
JD Allen Solar
Deren Tumkaya founded JD Allen Solar in 2019. Frustrated by the impersonal, sales-driven tactics of large firms, he set out to build a company with a strong ethical foundation that puts personal service and local expertise first.
