Are solar inverter repairs possible?

The banner image shows a solar installer investigating an inverter to see how it can be repaired.

The potential benefits of solar energy are appealing, saving money while positively impacting the environment is a great thing! However, if your solar power system doesn’t work as it should, it can detract from both your savings and environmental benefits. Rather than replacing entire panels, you might consider inverter repairs, and exploring if they’re a possibility for your situation. Solar inverter problems are well understood, which means there are several solutions to explore.

What is the lifespan of a solar inverter?

Solar inverters are crucial to the operation of your solar panels, and can usually last anywhere between 10 and 12 years. Inverters generally need to be replaced at least once throughout the lifespan of the panel due to electro-mechanical wear. Generally speaking, inverters have a shorter lifespan than the panels themselves.

The image shows a solar inverter with text below it explaining the most inverters last between 10 - 12 years. Beside the inverter is a picture of some solar panels with text below them explaining that they can last 25 years and beyond.

There are two primary types of inverters: string inverters and micro inverters. The latter can last nearly twice as long as the former: up to 25 years. Despite their extended longevity, the technology behind micro inverters is still new, and the promise of their longer lifespan has yet to be completely fulfilled.

It’s important to note that while solar panels have a collective lifespan of 10 to 25 years, there are environmental factors that can shorten this lifespan significantly. Remember that your solar system is exposed to the elements, including bad weather.

An efficient inverter that’s working as it should is critical; it is how the system converts the DC energy from the panels into AC energy that can be used within your home.

Why do solar inverters fail?

Solar inverters can fail for a wide variety of reasons, and when they do, it’s going to impact your solar panel capacity and how much electricity you’re able to generate in the system as a whole.

We list and expand upon the reasons as to why your solar inverter could be failing:

  • Heat
  • Faulty installation
  • Humidity
  • Poor maintenance


Heat and electronic systems have been enemies for as long as electronics have been around. Extended periods of direct sunlight can cause solar inverters to wear out prematurely; install your inverters in cool, dry places with plenty of fresh air.

Most electronic systems already tend to run several degrees hotter than room temperature with higher heat densities due to today’s smaller circuit sizes; prolonged heat negatively affects the inverter’s functionality. This is especially true in areas that are not temperature-controlled with air conditioning, e.g., outside.

Faulty installation

Your solar panels must be matched with properly sized inverters; solar panel capacity should not exceed 133% of inverter capacity. A bad installation can lead to issues in the future, including grid fault and maximum power point tracking (MPPT) errors. There should also be plenty of clearance in multi-inverter installations, to avoid heat transfer between units.


High humidity can degrade solar panels, negatively affecting the inverter’s ability to output proper current and voltage. Because the percentage of water vapour in humid air is higher than usual, incoming radiation from the sun refracts off this water and decreases inverter efficiency, potentially causing inverter failure.

Such water vapour can decrease your inverters’ energy output by as much as 30%.

Poor maintenance

Maintenance and cleaning is just as much a part of the solar process as the original installation. A well-maintained solar systems preserves your investment, and poor maintenance can cause your solar inverter system to fail. Inspect the outside of your inverter regularly for physical damage; clean regularly to ensure that dirt and dust are not clogging their cooling fins and vents as well.

Consider scheduling professional maintenance once every five years, wherein the inside of your inverter is inspected by a professional for corrosion, pests, and other signs of damage.

Remember that a failing battery can also just be a sign that it’s come to the end of its lifespan. Batteries are fickle, and battery storage issues in hybrid inverters are common as well.

Keep your inverter clear of debris as much as possible. These tiny maintenance tweaks aren’t just for show; they really do protect your inverter!

Repairing a solar inverter

The image shows a solar installer next to an inverter and a warranty booklet weighing up whether or not to repair the inverter or replace it.

Repairing a solar inverter will require a CEC trained professional well versed in solar technology, or a representative of the manufacturer.

There are, however, still some troubleshooting measures you can take, including the points outlined below.

Reset inverter

If you have some working knowledge of electrical systems, you can reset the inverter yourself. As this is a detailed process, it’s important to realise that you must be as careful as possible to avoid risking danger to yourself as well as further damaging the system.

Only attempt to reset the inverter if you know the process involved. You can always refer to a professional if you’re uncomfortable doing this yourself; this piece of troubleshooting is completely optional.

Check your fault codes

If your unit is displaying fault codes, it’s important to record them and save that information for a professional to review later. Since their job is to maintain solar inverters and other solar equipment, chances are, they’ll be able to use the information to determine what repairs are needed, or if the inverter needs to be replaced completely.

Replacing a solar inverter

Repair is often the first thought homeowners have when it comes to a failing solar inverter, but in many cases you may need to replace it completely. If you find that your item is just plain faulty, it’s time to review your options.

Check your warranty

If your inverter is still under warranty, then you are usually spared from a significant bill to replace it. The manufacturer may not replace it for free, but you typically pay a lot less than the full price for a replacement outside of the warranty period.

Check the paperwork that came with your inverter to see where you are within the warranty period. As you might imagine, the warranties vary between manufacturers, so it’s important to check your specific system.

How much will replacement cost?

The cost of replacing a solar inverter varies depending on the size and brand. A 3-phase inverter will typically cost at least $2,500, while the cost of a micro inverter will vary depending on how many need replacing.

Should you upgrade your system?

If you are looking at replacing a solar inverter, you may even consider a full system upgrade. After all, if the difference in price isn’t significant, committing to an upgrade holds more benefits than just replacing the inverter. Do your calculations before committing an entire new system though, to ensure it is worthwhile.

Will an installer upgrade your system?

Not every installer will agree to upgrade your system, some may have some reservations. There are liability issues at play and the installer may be concerned that they will be held responsible for the original installer’s work.

Depending on the age of your system, it may be difficult, or not viable, to upgrade.

Will you lose your premium FIT?

In some instances, upgrading your system may mean that you lose your premium feed-in tariff (FIT). Whether you lose your premium rate or not depends on the state in which you live as well as the size of your solar panel system and the one you are upgrading to. For example, in Queensland, if you’re on the 44c feed-in tariff rate and want to upgrade your inverter to a larger one and add more panels, you’ll likely lose your premium 44c tariff.

On top of that, the rules around premium feed-in tariffs can change and vary with retailer. We publish the best feed-in tariffs to help you make the best possible decision.

Don’t be wasteful

For many solar enthusiasts, the environment is the prime objective for going solar. Faulty solar inverters end up somewhere, but simply discarding them isn’t always the best idea. It’s best to look for ways to recycle the various solar panel system parts appropriately.

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