Most solar systems get installed, switched on, and then quietly ignored for years. That is understandable. Life is busy, and when the bills look reasonable you tend to assume everything is ticking along nicely. The problem is that a solar system can underperform for months without making it obvious. Shading creeps in as a neighbour's tree grows. An inverter starts dropping out quietly. A panel gets a coating of dust or bird activity that nobody notices from the street. The savings are still there, just not as much as they should be. This guide walks you through how to check your system is genuinely performing the way it was designed to, step by step, with the common traps called out along the way.

Step One. Understand What Your System Should Be Producing

Before you can judge whether your system is performing well, you need a baseline to compare against. This is where a lot of homeowners get stuck. They know their system is generating something, they just have no idea if that something is good or not.

Your installer should have provided you with an estimated annual or daily output figure when your system was designed. If you have that document, dig it out. If you do not, a rough rule of thumb used across the industry is that a quality solar system in South Australia will produce approximately four kilowatt hours per kilowatt of installed capacity on an average day across the year. So a 10 kilowatt system should produce around 40 kilowatt hours on a typical day. Some days much more, some days less, but that average matters over time.

The trap here is comparing a winter day to a summer day and drawing the wrong conclusion. South Australia has significant seasonal variation. A system producing well in September is not going to match what it does in December. Use weekly or monthly averages, not single day snapshots.

Step Two. Check Your Inverter or Monitoring App Daily Totals

Your inverter is the central record keeper of your system. Most modern inverters either have a small display screen or connect to a monitoring app on your phone. Both show you a daily generation total, and this is your single most useful number.

Here is how to use it properly. Pick a clear, sunny day with minimal cloud. Check the generation total at the end of the day before the sun goes down. Compare that number against your expected daily output for this time of year. If you are in late September in South Australia and your 10 kilowatt system produced 28 kilowatt hours on a clear sunny day, something is likely off. It should be doing considerably better than that on a cloudless spring day.

The trap to watch for here is inverter error codes sitting quietly on the display. Many homeowners walk past the inverter every day without glancing at it. Error codes like an illuminated fault light or a warning symbol are the inverter's way of telling you something needs attention. Do not ignore them and assume they will sort themselves out. They usually do not.

If your inverter does not have a monitoring app and is more than a few years old, it is worth asking your installer about retrofit monitoring options. Flying blind on system performance is not a position you want to be in.

Step Three. Cross Check Against Your Energy Bill

Your electricity bill is a surprisingly useful second opinion. Most SA energy retailers now show solar export data on the bill, and comparing this to what your inverter reports is a good way to catch discrepancies.

Look for two figures on your bill. How much energy you imported from the grid, and how much you exported back to it. Your inverter or monitoring app should show you total generation. A rough way to sense check this is. total generation should roughly equal your self consumption plus your export. If those numbers do not add up even loosely, there may be a metering issue, a communication fault, or a problem with the inverter reporting.

The trap here is assuming the bill is always right. Meters do occasionally develop faults, and billing errors do happen. If your export figure on the bill looks suspiciously low compared to what the inverter reports, raise it with your retailer and ask your installer to verify the meter setup. It is not common, but it happens enough to be worth checking.

Step Four. Look at the Panels Themselves

This one is simple and often overlooked. Get a visual on your panels. You do not need to get on the roof. Most panels are visible from the ground or from an upstairs window, and a quick look tells you a lot.

What you are looking for includes heavy soiling or dust buildup, bird droppings concentrated on specific panels, visible cracks or discolouration in the glass, and anything sitting on or over the panels like leaves, branches, or debris. South Australia's dry summers can leave a significant dust layer that noticeably reduces output, and targeted bird droppings on even one panel in a string can drag down the performance of other panels connected to it.

The trap here is underestimating how much a partially shaded or soiled panel affects the rest of the system. Depending on how your system is wired, one poorly performing panel can reduce the output of an entire string of panels. It is not always a one for one impact. It can be worse than that.

If you can see a clear problem from the ground, contact your installer. Do not attempt to clean or access the roof yourself. Panel cleaning and roof access should always be handled by qualified professionals for safety and to avoid voiding any warranties.

Step Five. Know When to Call a Professional

There are things you can check yourself, and there are things that genuinely require a qualified solar technician. Knowing where that line is saves you time and keeps you safe.

Call your installer or a qualified solar professional when you notice any of the following. Persistent error codes on the inverter that do not clear after a power cycle. A generation total that is consistently lower than expected across several clear days in a row. Any sign of physical damage to panels, wiring, or the inverter unit. A bill that shows dramatically reduced export without a change in your household usage patterns. Or a system that simply does not seem to be turning on in the morning at the expected time.

As Australia accelerates its investment in battery storage at every level of the grid, with record renewable and storage connections reported across the National Electricity Market in FY26 (NextMSC, 2026), the case for getting your existing solar system in top shape before adding battery storage has never been stronger. A battery paired with an underperforming solar system simply stores less. Sorting out any performance issues first means your whole energy setup works harder for you.

If your system is more than five years old and has never had a professional performance check, that alone is a good reason to book one. Technology moves quickly, and a qualified eye on your system can identify whether upgrades or repairs would meaningfully improve what you are getting out of it.

A Few Common Traps Worth Repeating

Keeping an eye on your system does not need to take much of your time. A quick glance at your monitoring app every few days, a visual check of the panels once a month, and a cross reference against your bill each quarter will catch most issues well before they become expensive ones. If something does not look right, the team at Track Energy has been working through exactly these kinds of situations across South Australia since 2012. We are happy to take a look and give you a straight answer on what is going on. Simple from start to switch on, and well beyond it.

Get a free solar quote from Track Energy. Visit trackenergy.com.au or call 0416 533 628