A solar system sits on your roof and quietly saves money. It is unsettling when the numbers look wrong or a red light appears on the inverter. The good news is that most solar problems fall into a short list of common causes. Many are harmless or easily explained. Knowing what to look for turns worry into a quick check. It also tells you when a problem genuinely needs a professional.
This guide walks through the usual reasons a Perth solar system appears not to be working. It covers what the inverter is trying to tell you. It shows what can be checked safely from the ground. It explains the point at which it is time to call an expert.
First, Rule Out the Weather
Before assuming a fault, remember that solar output naturally rises and falls with the sun. A cloudy day, a smoky sky, or simply the shorter days of a Perth winter will all pull production well below a bright summer peak. None of that means anything is broken. The right comparison is always like for like. Compare the same month against a previous year, or the day’s output against what the weather would allow.
The quickest way to tell a real fault from a quiet day is the system’s own monitoring app. If production is low but the day is dull, that is expected. If the app shows zero on a clear sunny day, or the inverter is showing a warning light, then it is worth looking closer.
What the Inverter Lights Are Telling You
The inverter is the brain of the system. It is the first place to look. Most inverters use a simple set of indicator lights or a small screen. As a rule of thumb, a steady green light means the system is running normally. It means you are feeding power as you should. A red or orange light during daylight hours means the inverter has flagged an event or a fault. It has usually stopped generating.
The single most useful thing to do before touching anything is to capture the fault. Take a photo of the inverter screen. Note the colour and pattern of the lights. Screenshot any message in the app. A fault code recorded at the moment it happens makes diagnosis far faster if the problem returns. It saves a technician guessing later.
The Common Perth One: Grid Overvoltage
One of the most frequent causes of a solar system cutting out in Perth is grid overvoltage. It is important to understand because it is not a fault you have caused. Australian standards require an inverter to shut down if the voltage in the local grid rises above a set safe limit. This is typically in the range of 255 to 258 volts. When that happens the inverter displays a grid overvoltage message. It simply waits, resuming automatically once the voltage settles back into a safe band.
This tends to happen in the middle of sunny days on streets with a lot of solar. Many systems are exporting at once. They push the local voltage up. The inverter shutting down is the system protecting your home. It is doing exactly what it is designed to do. An occasional overvoltage trip is normal. If it happens often and is costing real generation, it is worth reporting. There are network-side and system-side settings that can help.
Zero or Low Output: The Usual Suspects
When a system produces little or nothing on a day that should be productive, the cause is usually one of a handful of things:
- An isolator switched off. The DC (PV array) or AC isolator may have been switched off, sometimes accidentally. If the switches are off, the inverter has no power to convert.
- A connectivity drop. Sometimes the system is generating fine but the monitoring has lost its Wi-Fi connection. The app shows zero when the panels are actually working. The inverter screen will confirm which it is.
- Shading or soiling. New shade from a growing tree or a build-up of dust, leaves or salt on the glass can pull output down. This happens gradually rather than all at once.
- Low morning start-up. An inverter needs a minimum voltage from the panels to wake up. If it clicks a few times at sunrise and then shows a fault, there may be an issue on the array. A professional will need to trace it.
- A failed panel or component. This is less common. A single failed panel or a hardware fault will show as a drop that does not recover.
The System Keeps Dropping Out
A system that works, then cuts out, then returns is usually reacting to something intermittent. It is not a hard failure. Grid voltage moving in and out of the safe band is the most common reason in Perth. This is covered above. A dropped Wi-Fi connection can make monitoring appear to come and go. This happens even when generation is steady. Occasionally a firmware update or a loose connection is behind it. Note the times it happens. Note whether it lines up with the sunniest part of the day. This gives an installer a strong head start.
What You Can Safely Check Yourself
There are a few safe, ground-level checks you can make before calling anyone. None of them involve going onto the roof or opening any equipment.
- Check the monitoring app and the inverter screen. Note the light colour or any fault code.
- Confirm the solar isolator switches are in the on position. They are usually near the inverter and the meter box.
- Look for any obvious new shading over the panels. Check for a heavy build-up of dirt or leaves.
- Try one full shutdown and restart. Follow the inverter’s own procedure. This can clear a temporary glitch.
If a single restart does not fix it, that is the signal to stop and call a professional. Do not repeat the process. Two things should never be attempted. Do not climb onto the roof to inspect panels. Do not open the inverter or any electrical enclosure. Both are jobs for a licensed installer.
| What you see | Likely cause | What to do |
|---|---|---|
| Red light on the inverter in daylight | An event or fault code | Photograph the screen and code; do not keep resetting |
| App shows zero output at midday | Isolator off, a connectivity drop, or a fault | Check the isolators are on; if they are, book a check |
| A grid overvoltage message | Grid voltage above the safe limit | A normal safety shutdown; if frequent, report it |
| Output lower every day over weeks | Soiling or a developing fault | Compare like-for-like; arrange a clean or a check |
| System drops out then comes back | Grid voltage or Wi-Fi | Note the times; report the pattern to your installer |
| Burning smell, heat or water in the isolator | A safety hazard | Switch off if safe, keep clear, and call an installer now |
When to Call an Expert
Some situations call for a professional straight away. Do not do any further checking. A fault that returns after a single restart warrants a proper diagnosis. A system that fails to start on a clear sunny morning warrants a proper diagnosis. Output that keeps falling warrants a proper diagnosis. Above all, anything that suggests a safety risk needs urgent action. A burning smell, visible heat or scorching, buzzing, or water inside an isolator means the system should be switched off. Keep it well alone. Call a licensed installer immediately. Older isolator switches can let water in over time. This is a known hazard worth taking seriously.
How Positive Energy Protection Catches Faults First
Most of the trouble with solar faults is simply noticing them. A quiet inverter gives little away until the next power bill. Every Positive Energy Solutions system includes Positive Energy Protection, powered by Omnidian. It monitors the system against its expected output around the clock. When a fault or a shortfall appears, it is flagged early. The household is often unaware. Positive Energy Solutions is the single point of contact to diagnose it. We resolve many issues remotely. We manage any warranty claim.
For a Positive Energy Solutions customer, the checks in this guide are already being done automatically. Every installation is completed by our accredited installers and signed off to Positive Energy’s completion standards. It is backed by a 10-year installation workmanship warranty. A local Perth team supports you. A genuine fault is caught and handled. It does not quietly cost generation for months.
Frequently Asked Questions
Why is my solar producing nothing today?
First check the weather and the season. Low output on a dull or short winter day is normal. If the day is clear and sunny and the app still shows zero, check that the isolator switches are on. Look at the inverter screen for a fault light or code. Then book a check if needed.
What does a red light on my solar inverter mean?
A red or orange light in daylight usually means the inverter has flagged an event or fault. It has stopped generating. A steady green light means it is running normally. Photograph the screen and note the code before doing anything else.
Should I reset my inverter myself?
A single full shutdown and restart is fine. Follow the inverter’s own procedure. This can clear a temporary glitch. If the fault returns, stop there and call a professional. Do not reset repeatedly. Never open the inverter or go onto the roof.
What is a grid overvoltage error?
It is the inverter shutting down to protect your home. This happens when the local grid voltage rises above the Australian safe limit. It often happens on sunny days on streets with a lot of solar. It is not a fault you caused. The system resumes on its own. If it happens often, it is worth reporting.
Who do I call for a solar fault in Perth?
Your installer. For Positive Energy Solutions customers, the system is already monitored. Positive Energy Solutions is the single point of contact. We diagnose the issue. We manage any warranty claim on your behalf.
Get a Straight Answer on Your System
Most solar problems are minor, explainable, and quick to resolve. The cause must be clear. The difference between a scare and a simple fix is knowing what to look for. It is having a local team watching the system when something does go wrong. Positive Energy Solutions designs, installs and monitors solar and battery systems for real Perth homes.
Talk to the local team if your system is not behaving as it should: positiveenergy.com.au/contact/
About the Author
Jason Wiktorowicz
Sales Manager, Positive Energy Solutions | Perth, WA
Jason has been at the centre of Western Australia’s energy transition for over a decade. He was Orchestration Lead on Project Symphony. It is WA’s largest virtual power plant pilot. He was Stream Lead on Project Encore. He worked directly with AEMO, Western Power and Energy Policy WA. He shaped how distributed energy resources connect and operate on the SWIS. That work included developing and rolling out CSIP-AUS. It is now mandatory for all new WA grid connections. He also led Emergency Solar Management. It is the first program of its kind in WA. He led VPP for Schools. It provided direct market benefits through Supplementary Reserve Capacity. He led REBAR, the WA Residential Battery Rebate scheme.
His earlier career spanned Synergy, Infinite Energy and Curtin University’s Sustainability Policy Institute. He co-authored peer-reviewed research on net-zero urban precincts, solar integration and peer-to-peer energy trading. It was published in the journal Urban Planning in 2018.
At Positive Energy Solutions, Jason leads sales with a focus on system design accuracy and long-term performance. Positive Energy Solutions installs solar and battery systems, EV chargers and heat pumps. We hold partner accreditations with Fronius, SigEnergy, iStore and SunPower.
10-year installation workmanship warranty. Positive Energy Protection, powered by Omnidian, performance monitoring included on all systems.
