Your solar inverter is the brain of your entire solar system.
It converts the DC power from your panels into usable AC power for your home, and without it, your solar system simply won’t work.

But here’s the problem:
Most inverter failures don’t happen overnight.
They show early warning signs that many homeowners overlook, until it becomes a full system shutdown.

This guide will help you identify inverter problems early, avoid expensive repairs, and protect your solar investment.

1. Flashing or Red Warning Lights

Solar inverters use light indicators to tell you what’s happening.

Warning lights to take seriously:

• Solid red: Critical fault

• Flashing red: Major issue or shutdown

• Orange/amber: Warning or reduced performance

• Flashing constantly: Internal diagnostics failing

If your inverter isn’t showing a solid green light, something isn’t right.

2. Sudden Drop in Solar Power Output

If your solar system normally generates a certain amount and suddenly drops:

• From 5 kW to 1–2 kW, or

• From normal daily output to almost nothing

It’s often an inverter fault.

Common causes include:

• Cooling fan failure

• Faulty MPPT tracker

• Internal component wear

• Overheating

• Software malfunction

Even a small performance dip is worth checking early.

3. Strange Noises Coming From the Inverter

Solar inverters should be quiet.

If you hear:

• Clicking

• Buzzing

• Humming

• Ticking

• High-pitched whines

It means internal components are struggling.

This is usually an early sign of:

• Capacitor failure

• Overheating

• Loose internal connections

• Fan or cooling system malfunction

Ignoring unusual sounds often leads to full failure.

4. Overheating or Hot to Touch

Your inverter needs airflow to stay cool.

If the unit is:

• Hotter than normal

• Overheating and shutting down

• Located in direct sun

• Near a BBQ, heater, or hot surface
  
  

It will eventually fail.

Modern inverters shut down themselves when heat levels become unsafe. Frequent overheating is a major red flag.

5. Intermittent Shutdowns or Random Reboots

If your inverter turns off and on throughout the day, it indicates:

• Voltage fluctuations

• Connection issues

• Bad wiring

• A failing DC isolator

• An internal fault

Even if it restarts and works again, this should never be ignored.

6. Error Codes on the Display Screen

Most homeowners ignore error codes — but they are direct clues.

Common inverter errors:

• Isolation fault

• Grid overvoltage

• DC overcurrent

• Ground fault

• Relay failure

• PV overvoltage

Some are simple fixes…
but others indicate serious safety risks.

A licensed solar electrician should always check any error code.

7. Wi-Fi Monitoring Showing Irregular Data

More solar systems now have Wi-Fi monitoring apps.

Warning signs include:

• Zero production during sunny hours

• Output dropping randomly

• “System fault” notifications

• Inverter not communicating at all
  
  

If the data looks suspicious, your inverter may be the cause.

8. Burning Smell or Discolouration Around the Unit

This is an urgent safety risk.

Burning smells usually mean:

• Component overheating

• Melted wiring

• Internal fire risk

• Failed surge protection inside the inverter

If you ever smell burning:
Turn the system off immediately and call a professional.

Why Inverter Problems Should Never Be Ignored

A faulty inverter can cause:

• Total solar system shutdown

• Expensive component failure

• Loss of solar savings

• Fire hazards

• Voided warranties

• Safety risks for your home

Most inverter issues start small, and fixing them early prevents major damage.

Final Word: Protect Your Solar Investment Before It Fails

A healthy inverter keeps your entire solar system running smoothly and safely. If you notice any of the warning signs above, get it checked immediately.

Need a solar inverter inspection or repair? Call us today for fast, reliable, and professional service. Keep your solar system performing at its best.