Solar Inverter Replacement: Repair, Replace or Go Hybrid?

If your solar has stopped producing, the inverter is the first suspect, and usually the right one. It's the hardest-working part of the system: it converts every kilowatt-hour your panels make, it runs hot in a Queensland summer, and it's packed with electronics that don't last forever.

The good news is that a dead inverter almost never means a dead solar system. The panels on your roof usually have plenty of life left. The question is what to put on the wall in its place, and whether this is the moment to plan for a battery.

Solar inverter replacement is usually needed once in the life of a system, because string inverters typically last 10 to 15 years while panels last 20 to 30. Some inverter faults can be repaired, such as failed cooling fans, surge protection, loose or corroded terminations and firmware problems, but a failed main power board generally can't, and if the manufacturer has left Australia, replacement is the only real option. If you're planning to add a battery in the next few years, replacing a failed inverter with a hybrid inverter is usually better value than a like-for-like swap.

How long does a solar inverter last?

The federal government's solar guide puts the average lifespan of a string inverter at 10 to 15 years and a microinverter at 20 to 25 years (energy.gov.au). Its warranty guide also notes that for most solar systems, inverters will need to be replaced before the panels (energy.gov.au).

Source: energy.gov.au lifespan and warranty guides. Actual life depends heavily on heat, ventilation, installation quality and the brand.

That matches what we see on the Sunshine Coast. Many systems installed during the 2011 to 2013 rebate wave are already on their second inverter or due one. Heat is a big factor: an inverter mounted in full afternoon sun on a west-facing wall works harder and runs hotter than one in a shaded garage, and on coastal homes, salt air adds corrosion to the mix.

Signs your inverter is failing

Before you assume the worst, it's worth knowing what a failing inverter looks like and what can be something simpler. Our troubleshooting guide for when your solar inverter is not working goes through this step by step. The short version:

• Zero output, or a blank screen. Could be a dead inverter, but also a tripped breaker, a switchboard fault or a failed DC isolator. Check those before condemning the inverter.
• Error codes. Insulation (ISO) faults usually mean moisture in a DC connector or junction box, not necessarily a faulty inverter. Grid overvoltage faults mean the network voltage is too high for the inverter to export into.
• Output well below normal for the season. Can be the inverter, shading, dirty panels or a failed string.
• Loud fan noise, clicking or the unit cycling on and off.
• A burning smell, scorch marks or water inside an isolator. Treat this as urgent. Switch the system off at the AC isolator and the main solar breaker and call a licensed electrician before touching anything else.

And one more: your power bill went up and you didn't notice the solar had stopped. It happens a lot. Monitoring that's dropped off the Wi-Fi is often how a dead inverter goes unnoticed for months.

Can solar inverters be repaired?

Some can, some can't, and an honest technician will tell you which before charging you for a repair that won't hold.

Often repairable in the field:

• blocked or failed cooling fans
• surge protection devices
• loose terminations
• corroded DC inputs
• firmware problems

Generally not repairable:

• a failed main power board
• extensive internal damage from water, heat or a lightning surge
• units whose manufacturer no longer supplies parts in Australia

There's also a middle ground. Some manufacturers will support units long after the installer has moved on, either under warranty or with an out-of-warranty exchange program. Where there's a supported path, we chase it for you before recommending a replacement.

How much does it cost to repair or replace a solar inverter?

We don't publish a single price, because there isn't one, and any figure you see online without a diagnosis attached is a guess. What we can tell you is what drives the cost.

Factors that change a repair or replacement price:

• What's actually wrong. A reconnected Wi-Fi dongle costs nothing. A replaced fan is a small job. A failed power board means a new inverter.
• Warranty status. Within the product warranty, the replacement unit should be covered. The government guide notes replacements should be free within the warranty period (energy.gov.au). Check whether labour and call-out are covered too, because some warranties only cover the part.
• Inverter size and type. A larger inverter, a three-phase unit or a hybrid costs more than a small single-phase string inverter.
• Like-for-like or upgrade. A straight swap is simpler. Moving to a hybrid adds hardware but can save you paying for the same work twice later.
• Compatibility with your panels. The new inverter has to suit your existing strings' voltage and current. Sometimes the strings need rearranging.
• Compliance work. Any replacement must meet current AS/NZS 4777.2 requirements and be approved for connection. Older installations sometimes need isolators, cabling or switchboard work brought up to current standards.
• Access and location. A difficult mounting position, a long cable run or a new location (for example, moving it out of direct sun) adds time.

Here's how we price it: every job starts with a free phone diagnosis. Tell us what the screen or app is showing and we'll tell you whether it's something you can safely reset yourself or something that needs a licensed electrician on site. A monitoring dropout is often sorted on the call. A failed inverter is a quoted job, and you get the number in writing before anything is booked.

Inverter out of warranty: what are your options?

Being out of warranty doesn't always mean paying full price for a new unit.

1. Check whether the manufacturer still supports the model. Some offer out-of-warranty exchanges or repairs through their Australian service centre.
2. Check whether the warranty is really expired. Some inverters had extended warranties registered at installation that owners don't know about. Serial numbers tell the story.
3. If your installer has closed down, your inverter warranty isn't automatically void. Panel and inverter warranties are manufacturer warranties held by the manufacturer or its Australian distributor, and they often survive the installer going under. What you lose is the workmanship warranty. We take on these "orphaned" systems, identify the equipment and lodge any claim on your behalf through our warranty support process.
4. If the manufacturer has left Australia, there are no parts and no claim. Replacement is the only honest answer.

Like-for-like, or upgrade to a hybrid inverter?

Your old inverter was sized for the system you had when it was installed. Before you drop the same model back on the wall, ask whether your plans have changed.

Replace like-for-like when:

• you have no plans for a battery
• the array isn't changing
• you're on the legacy 44c Solar Bonus Scheme tariff (more on that below)

Upgrade to a hybrid inverter when:

• you're planning a battery in the next few years
• you want to add panels and need more inverter capacity
• your array has already changed since the original install

Our retrofit rule of thumb is simple. If the existing inverter is healthy and under eight years old, a battery can be added alongside it (AC-coupled) and the inverter stays. If the inverter is failing or out of warranty, or you're expanding the array, replace it with a hybrid and go DC-coupled. Panels and battery then share one inverter, with one fewer conversion step and one warranty point of contact.

Doing it in one visit matters. If an inverter replacement is on the cards and a battery is anywhere in your plans, price the battery at the same time, because doing both together avoids paying twice for the same switchboard and metering work. Our guide to adding a battery to existing solar covers the options in more detail, and our comparison of the best solar inverters in Australia runs through the brands.

A warning for 44c Solar Bonus Scheme customers

If you're still on Queensland's 44c Solar Bonus Scheme feed-in tariff, talk to us before changing anything. The Queensland Government's rules say you must replace your inverter with one of the same or smaller size, replace components like-for-like, and you lose the tariff if you increase your inverter capacity. Batteries can only be used when the 44c system isn't operating, unless they're on a separate connection (qld.gov.au).

That tariff expires on 1 July 2028. For some households, the right move is a like-for-like replacement now and a bigger upgrade after 2028. For others, the 44c tariff is no longer worth much because their array is small and their usage has grown. We'll run both options with you.

What a replacement job involves

A proper inverter replacement is more than unbolting one box and bolting on another. On our jobs it includes:

1. Diagnosis: reading the fault log and confirming it's the inverter, not an isolator, breaker or string fault.
2. Panel and string testing: voltage, current and insulation resistance on each string, so the new inverter isn't connected to a hidden fault.
3. Isolator and connector check: rooftop DC isolators are a known failure point on older installs and often need replacing at the same time.
4. Network approval: lodging any required notification or application for the new inverter.
5. Install and commissioning: settings checked against AS/NZS 4777.2 and current network requirements.
6. Monitoring: reconnected to your Wi-Fi with fault alerts set up, so the next problem is caught in days rather than at the next quarterly bill.
7. Removal and recycling of the old unit. Inverters can be recycled as e-waste.

If your inverter has stopped or is throwing faults, our solar inverter repair service starts with that free phone diagnosis, and we work on any brand, including systems we didn't install.

Frequently asked questions

What is the lifespan of a solar inverter?

A string inverter typically lasts 10 to 15 years and a microinverter 20 to 25 years, according to the federal government's solar guide. Heat, ventilation, installation quality and brand all affect it. Most systems need one inverter replacement during the life of the panels.

How much does it cost to repair a solar inverter?

It depends on the fault. Some problems, like a monitoring dropout, cost nothing to fix. Field repairs such as a cooling fan or surge protection are smaller jobs. A failed main power board usually means a new inverter. We start with a free phone diagnosis and give you a written price before anything is booked.

Can solar inverters be repaired?

Sometimes. Cooling fans, surge protection devices, loose terminations, corroded DC inputs and firmware problems can often be fixed in the field. A failed main power board generally can't, and if the manufacturer has left Australia there are no parts, so replacement is the only option.

Should I replace my inverter with a hybrid?

If you're likely to add a battery in the next few years, usually yes. A hybrid inverter lets the battery connect directly (DC-coupled), and doing the inverter and battery work together avoids paying twice for switchboard and metering work. If you're on the 44c Solar Bonus Scheme, check the rules first, because increasing inverter size can cost you the tariff.

Do I need to replace my solar panels when I replace the inverter?

Usually not. Panels typically outlast inverters by a decade or more. We test the panels and strings during the job, and if they're healthy they stay.

Is inverter replacement covered by warranty?

Within the manufacturer's product warranty, the replacement unit should be covered, but check whether labour is included. If your installer has closed, the manufacturer warranty often still stands. Out of warranty, some manufacturers offer exchange programs.