Solar PV Inverter Repair and Renewal

Expert Solar PV Inverter Fault Diagnosis & Repair Services

Your solar inverter is the heart of your solar PV system. It converts the electricity generated by your solar panels into usable power for your home or business. When an inverter develops a fault, your solar system may stop generating electricity entirely or operate at significantly reduced efficiency.

At RB Grant Electrical Contractors, we provide professional solar inverter fault diagnosis, troubleshooting and repair services throughout Scotland. Whether your inverter is displaying an error code, has stopped working completely, or your system's performance has dropped unexpectedly, our experienced solar engineers can help.

What Does a Solar Inverter Do?

Solar panels generate Direct Current (DC) electricity. The inverter converts this into Alternating Current (AC) electricity that can be used throughout your property or exported to the grid. Without a functioning inverter, your solar panels cannot deliver usable power to your home or business.

Because the inverter manages the electrical conversion process, it is often one of the most important components within a solar PV system. Industry articles reviewed indicate that inverter and electrical component issues account for a significant proportion of solar system failures.

Common Solar Inverter Faults

Solar System Not Producing Power

One of the most common symptoms of an inverter fault is a complete loss of power production.

Potential causes include:

Inverter shutdowns
Internal component failure
Grid connection faults
DC isolation faults
Tripped protection devices

Error Codes & Warning Messages

Many modern inverters display fault codes when a problem occurs.

Common fault indicators include:

Grid faults
Over-voltage faults
Isolation faults
Communication errors
DC input issues

Reduced Solar Performance

If your generation figures suddenly drop while weather conditions remain similar, the inverter may not be operating correctly.

Possible causes include:

Internal electronic component degradation
Software or firmware issues
Cooling system problems
Electrical faults

Unusual Noises

Buzzing, clicking, humming or fan issues can indicate that internal inverter components require inspection.

Our Solar Inverter Repair Services

Inverter Fault Diagnosis

We use professional testing equipment to identify the cause of inverter failures and system performance issues.

Our service includes:

System health assessment
Error code analysis
Generation performance checks
Electrical testing
DC and AC circuit inspections

Solar Inverter Repairs

Where practical and economically viable, we can arrange repair or replacement solutions for faulty inverter systems.

We assist with many leading manufacturers including:

SolarEdge
Fronius
Growatt
Fox ESS
SolaX
Sigenergy
Sunsynk
Tesla Powerwall Gateway systems
Other major inverter brands

Inverter Replacement Services

If an inverter cannot be repaired cost-effectively, we can recommend and install a suitable replacement system.

Our engineers will ensure:

Correct inverter sizing
Safe installation
Grid compliance
Testing and commissioning
System optimisation

Monitoring & Performance Investigations

If your solar system isn't generating as expected, we can investigate:

Historical system performance
Monitoring platform data
Inverter communication faults
Battery integration issues
Export limitation problems

Signs You Need an Inverter Inspection

✅ Solar generation has stopped

✅ Inverter display is blank

✅ Fault lights or error codes

✅ Unexplained increase in electricity bills

✅ Monitoring system warnings

✅ Significant drop in energy production

✅ Intermittent system shutdowns

✅ Strange noises from inverter equipment

These symptoms are commonly associated with inverter faults and system performance issues.

Why Choose RB Grant?

MCS & NICEIC Approved

Trusted professionals delivering safe and compliant renewable energy solutions.

Solar PV Specialists

Extensive experience with domestic and commercial solar energy systems throughout Scotland.

Rapid Fault Finding

We identify faults quickly to minimise lost energy generation.

Independent Advice

Honest recommendations on whether repair or replacement represents the best value.

Fully Insured

Professional service backed by comprehensive insurance and industry accreditations.

Domestic & Commercial Solar Inverter Repairs

We support:

Residential solar PV systems
Commercial solar arrays
Battery storage systems
Hybrid inverter systems
Off-grid solar systems
Agricultural solar installations

Frequently Asked Questions

Can a solar inverter be repaired?

Many inverter faults involve replaceable components or electrical issues which may be repairable, depending on the age, condition and manufacturer support available.

How do I know if my inverter is faulty?

Common signs include fault codes, reduced performance, blank displays, unexpected shutdowns and unusual noises.

How long do solar inverters last?

Lifespan varies depending on manufacturer, operating conditions and installation quality. Individual manufacturers provide warranty periods that should be checked against your system documentation.

Can you replace older inverters?

Yes. We can assess older systems and recommend modern replacement options compatible with your existing solar array.

Book a Solar Inverter Inspection

If your solar PV system is not performing as expected, don't lose valuable energy generation.

RB Grant Electrical Contractors provide professional solar inverter repairs and fault diagnosis services across Scotland.

Call 01592 654553 today to arrange an inverter inspection and repair quotation.

Just some of the steps you can take to resolve your inverter issue. If this fails then call us today for a free estimate and advise. We offer a range of battery storage repairs & PV repairs

Inverter Help is Here

Check you inverter App or onboard screen

First place to look for an inverter fault in the app found with most modern inverters. For older inverters you need to look at the onboard screen. You can easily download you inverter manual from the internet to assist.

Inverter fault codes

Your inverter will let you know what the fault is by displaying a fault code. You can find these codes in your inverter manual.

Is your inverter power on?

You need to go the fuseboard and make sure the circuit breaker is on. You should also check its not a RCD main switch that has tripped. You should also have an additional inverter rotary isolator and make sure you have lights on the PV generation meter.

Try and reset the inverter

This is best performed during daylight hours. You need to isolate the power by either switching off the circuit breaker or the rotary isolator. Once power is off wait 15 minutes and put the inverter back on.

Inverter still not working?

Time to phone an expert then. Take a note of the manufacturer, model and serial number. If the inverter is still under warranty then phone the manufacturer. If its out with the warranty you need an experienced solar pv installer to help.