Solar Panels Not Generating Electricity?
If your solar system has stopped generating, is producing less than expected or your FIT meter is no longer recording correctly, Mr Solar can diagnose the fault and explain the best way to get the system working again.
Why Has My Solar System Stopped Generating?
We see these problems regularly. Sometimes the system is still generating but the meter or monitoring is wrong; in other cases the inverter or another part of the installation has failed.
Inverter Problems
The inverter converts the DC electricity produced by the panels into usable AC electricity. If the inverter fails or malfunctions, the solar system may partially or completely stop supplying usable power.
FIT Meter Problems
A faulty generation meter may stop accruing units even when the panels are still producing. This can affect the readings used for Feed-in Tariff payments and make performance harder to assess.
Dirt & Dust Build-Up
Heavy contamination, bird fouling, dust or debris can reduce the amount of sunlight reaching the panel surface. Cleaning may be worthwhile where contamination is materially affecting performance.
Poor Workmanship
Incorrect connections, installation errors or poorly secured components can cause a system to malfunction. Proper testing is needed to determine whether the fault is with the equipment or the installation itself.
The Inverter Is Often the First Place to Check
Inverter failure is one of the most common reasons an older solar PV system stops generating correctly.
If the inverter cannot convert the DC electricity from the panels into AC electricity for the property, you may see zero generation, reduced output, fault codes, warning lights or repeated tripping.
- No generation shown on the inverter
- Fault or error code displayed
- Warning or red light
- Repeated AC or DC trips
- Unusual clicking, heat or noise
- Monitoring portal showing no output
We can normally begin with simple checks
Before attending site, we can often narrow down the likely issue by asking you to check the inverter display, fault code, generation meter and AC protection.
Where further testing is needed, we can inspect both the DC and AC sides of the inverter and assess the condition of the wider solar installation.
Thermal Drone Surveys
Thermal drone surveys provide a fast, non-invasive way to identify solar PV faults that may not be visible from the ground.
High-resolution thermal imaging can reveal overheating panels, defective cells, failed bypass diodes, loose connections and other conditions associated with reduced performance or safety concerns.
Useful for diagnosing:
- Overheating solar panels
- Defective cells
- Failed bypass diodes
- Underperforming strings
- Loose or high-resistance connections
- Large or difficult-to-access installations
Thermal surveys can help target repairs more accurately and minimise unnecessary disruption.
Request Solar Fault Support
Tell us what your system is doing, including any inverter fault code, warning light or loss of generation. We can often begin the diagnosis from the information you provide.
If possible, include the inverter make and model, when the problem started and whether the system has stopped completely or is producing less than expected.
Common Questions About Solar Inverter Faults
How do I know if my inverter is faulty?
Common signs include no generation, reduced output, error messages or fault codes, warning lights, or repeated tripping of fuses or breakers.
What should I do if my inverter shows a fault code?
Make a note of the code and any warning lights displayed. If the fault does not clear on its own, contact a qualified solar engineer to carry out testing and diagnosis.
Can an inverter fault stop my system working completely?
Yes. The inverter converts DC electricity from the panels into usable AC power. If it fails, your system may partially or completely stop generating.
Is it safe to keep using a faulty inverter?
Not always. Some inverter faults can pose electrical or fire risks. If you believe there is a serious issue, switch the system off if safe to do so and seek professional advice.
How long do solar inverters last?
Many inverters operate for around 7–12 years, depending on usage, environment, ventilation and manufacturer quality.
Can you repair or replace inverters you didn’t install?
Yes. Mr Solar tests, repairs and replaces inverters regardless of the original installer.
Is my inverter covered by warranty?
Many inverters have manufacturer warranties, often with optional extensions. We can help identify the inverter model and advise on the next steps where a warranty may still apply.
Should I repair or replace my inverter?
This depends on the age of the inverter, the nature of the fault and parts availability. After testing, we can explain the most sensible repair or replacement option.
Professional Testing and Repair
Solar inverters contain dangerous AC and DC voltages. Customers should never open the inverter, disconnect DC connectors or attempt internal repairs themselves.
Our inspection and repair work considers:
- BS 7671 IET Wiring Regulations
- Manufacturer installation and safety guidance
- Relevant MCS requirements where applicable
- Correct testing of AC and DC components
If there is a burning smell, smoke, excessive heat, arcing or visibly damaged wiring, isolate the AC supply if it is safe to do so and seek professional assistance.
Don’t leave a non-generating solar system losing energy and income.
Mr Solar provides professional solar testing and inspection across Norfolk and Suffolk, backed by over 15 years of industry experience.
