A working solar inverter shows a solid green light and real-time power output on its display.
If your power bills have crept up or your monitoring app shows flat production, your inverter might have quietly stopped doing its job. Inverters fail more often than panels, and most homeowners have no idea theirs has been sitting idle for weeks.
This guide walks you through five quick checks you can do right now, no tools required. We cover LED lights, display readings, monitoring apps, and the common faults that trip up systems on the Mid North Coast.
Need help with your solar system? SolaXs installs and services residential solar across the Port Macquarie region with over 25 years of experience.
Check Your Inverter LED Lights First
Every solar inverter has LED indicator lights on the front panel, and they tell you exactly what state your system is in. You do not need to open anything or touch any wiring. Just look at the light colour.
- Solid green to normal operation, your system is generating power
- Flashing green to the inverter is starting up (normal at dawn or after a reboot)
- Orange or yellow to a warning or reduced output, often caused by heavy cloud or high grid voltage
- Red to a fault that needs investigation
- No lights at all to the inverter has no power, it may be switched off or have failed completely
If you see a solid green light during daylight hours, your inverter is probably fine. A red light or no lights at all means something is wrong and you should keep reading.
What Your Solar Inverter Display Should Show
The LED light only tells part of the story. Your inverter display screen shows actual numbers, and those numbers tell you whether your system is performing or just pretending. Check these readings between 10am and 2pm on a clear day for the most accurate picture.
- Current output (kW) to this should be above zero during daylight. A 6.6kW system typically produces 4 to 5kW at peak on a clear day.
- Daily energy (kWh) to cumulative total for today. Check at sunset for your daily figure.
- Lifetime energy (kWh or MWh) to total since installation. If this number has not changed in days, your system is not generating.
- Grid voltage to should sit around 230V. Readings consistently above 253V can cause shutdowns.
Here is a rough guide to what a healthy system should produce on the Mid North Coast.
| System Size | Peak Output (Clear Day) | Daily Average (Summer) | Daily Average (Winter) |
|---|---|---|---|
| 5kW | 3.5 to 4.5kW | 22 to 26kWh | 12 to 16kWh |
| 6.6kW | 4.5 to 5.5kW | 28 to 33kWh | 16 to 20kWh |
| 10kW | 7 to 9kW | 40 to 48kWh | 24 to 30kWh |
| 13kW | 9 to 11kW | 52 to 60kWh | 30 to 38kWh |
If your numbers are well below these ranges on a sunny day, something is off. Dirty panels, shading, or an inverter fault could be the cause.
How to Check Your Solar Inverter From Your Phone
Most inverters installed in the last five years have WiFi monitoring built in. If yours is connected, you can check if your solar inverter is working without leaving the couch. The app shows real-time output, daily and monthly production graphs, and alerts when something goes wrong.
| Inverter Brand | Monitoring App | Cost |
|---|---|---|
| Fronius | Solar.web | Free |
| Sungrow | iSolarCloud | Free |
| GoodWe | SEMS Portal | Free |
| Huawei | FusionSolar | Free |
| Enphase | Enphase App | Free |
| SolarEdge | mySolarEdge | Free |
If your inverter is not connected to WiFi yet, check out our guide on connecting your solar system. Most brands only need your home WiFi password and five minutes. The Australian Government’s solar monitoring guide also has useful tips.
For a brand-independent option, Solar Analytics monitors any system for around $10 per month and sends automated fault alerts. Worth it if you want a set-and-forget approach.
Common Solar Inverter Faults That Stop Your System
When your inverter stops working, there is usually a specific reason. Here are the faults we see most often on the Mid North Coast, and what each one actually means.
- High grid voltage to the most common cause of inverter shutdowns in suburban Australia. When too many homes export solar at once, the local grid voltage rises above 253V and your inverter shuts down to protect itself. Contact your network provider (Ausgrid or Essential Energy) to request a voltage investigation.
- Overheating to inverters in direct sun or enclosed spaces overheat in summer. They throttle output or shut down completely. Ensure your inverter has shade and at least 200mm clearance on all sides.
- Isolation or earth fault to often appears with morning dew and clears by midday. If it persists, you likely have moisture in a cable join or a degraded connector. This one needs an electrician.
- Arc fault to a burnt smell or discoloured connectors. This is a safety hazard. Turn off your DC isolator and call your installer immediately.
- Communication loss to your inverter is still generating but the monitoring app shows nothing. Usually a WiFi dropout. Check your router and the inverter WiFi settings.
Safety reminder: Never open your inverter or work on DC wiring yourself. Only a licensed CEC-accredited electrician should perform solar electrical work. Your job is to check the external indicators and call a professional when something looks wrong.
The Five-Minute Solar Inverter Health Check
Run through this quick checklist once a month. It takes five minutes and catches most problems before they cost you money. Do it between 10am and 2pm on a day with clear skies.
- Walk to your inverter to check the LED light is solid green
- Read the display to confirm current output is above zero and matches roughly what your system size should produce
- Check for error codes to note any fault codes and look them up in your inverter manual
- Listen to a gentle hum is normal. Buzzing, clicking, or rattling is not.
- Open your monitoring app to compare today’s production to the same day last month. A drop of more than 30% on a similar weather day is a red flag.
- Check your electricity bill to look for feed-in credits. If they have disappeared or dropped sharply, your system may have been offline.
If everything checks out, you are good. If any step raises a concern, the next section tells you when to get professional help.
When to Call a Solar Electrician
Some inverter problems fix themselves. A morning isolation fault that clears by midday is annoying but usually harmless. Other problems need a qualified sparky, and waiting too long costs you money in lost generation.
Call a CEC-accredited installer if:
- Your inverter shows a red light or error code that does not clear after a reboot
- Production has dropped more than 30% compared to the same period last year
- You can smell burning or see discoloured connectors
- The inverter makes unusual noises (loud buzzing, clicking, or rattling)
- Your system is more than 10 years old and you have never had it serviced
String inverters typically last 10 to 15 years, so if yours is getting close to that age, a check-up is a smart move. SolaXs services and replaces inverters across the Mid North Coast. We are local, CEC accredited, and have been doing this for over 25 years.
Keep Your System Earning Its Keep
A solar system that is not working is just an expensive roof decoration. The good news is that checking your inverter takes minutes, not hours.
Green light, real numbers on the display, and steady production in your app. That is all you need to see.
If something looks off, do not sit on it. Every day your inverter is down is money you are paying the grid instead of saving. Get in touch with the SolaXs team for a system health check, or check out our solar battery options if you are thinking about storing what your panels produce.
Contact SolaXs for a free solar health check on the Mid North Coast.
Common Inverter Problems Mid North Coast Homeowners Should Watch For
Living on the Mid North Coast means your solar system deals with salt air, humidity, and occasional storm surges that inland systems rarely face. These conditions can accelerate wear on inverter components and cause faults that might not appear in drier climates. Catching problems early saves you from extended downtime and costly repairs.
One of the most overlooked issues is poor ventilation around the inverter. If your unit is boxed in or sitting in direct afternoon sun, it will throttle its output to protect itself from overheating. This means you could be losing generation on the hottest days when your system should be working hardest.
- Ensure your inverter has at least 200mm clearance on all sides for airflow
- Check for corrosion on DC isolator switches, especially within a few kilometres of the coast
- Look for error codes on your inverter display each morning before it starts generating
- Monitor your system output through the manufacturer’s app to spot gradual performance drops
- Have a CEC-accredited installer inspect your system if generation drops more than 15% without explanation
Choosing the Right Inverter for Mid North Coast Conditions
The Mid North Coast gets around 5.2 peak sun hours per day, which is enough to make most solar installations highly productive. But humidity, salt air near the coast, and summer storms all affect inverter longevity.
- IP65 rating or higher: Coastal homes need an inverter rated for moisture and dust ingress. Most quality brands meet this, but check before buying.
- Built-in surge protection: Lightning activity on the Mid North Coast is higher than the national average. An inverter with integrated surge protection saves you from replacing it after a close strike.
- Warranty length: Look for at least 10 years. Premium brands offer up to 15 or 25 years, which matters when the inverter typically outlasts the panels.
- Monitoring app quality: A good monitoring app lets you spot production drops early. Check that the app works reliably on both iOS and Android before committing.
If you are unsure which inverter suits your setup, get in touch with SolaXs. We assess your roof orientation, shading, and energy usage before recommending a brand.
Some faults are simple enough to identify yourself, but anything involving wiring, DC isolators, or internal components must be handled by a licensed professional. Working with high-voltage DC electricity is genuinely dangerous. If your inverter is showing persistent faults or you’ve noticed a significant drop in output, get in touch with our team for a proper diagnosis. With 25+ years of local experience, we’ve seen every inverter issue the Mid North Coast can throw at a system.