A solar inverter converts the direct current (DC) electricity your solar panels generate into alternating current (AC), which is what your home and the electricity grid run on. Without one, your home solar power system produces energy you cannot use. The type of inverter you choose affects everything from daily output to whether you can add a battery later.
What is a solar inverter?
Solar panels produce DC electricity, where current flows in one direction. Your household appliances all run on AC electricity, where the current reverses direction 50 times per second (50 Hz in Australia). A solar inverter sits between your panels and your switchboard, converting that DC output into grid-compatible 230V AC power that your home can actually use.
The term “inverter” comes from the fact that it inverts the direction of current flow, switching it back and forth to create an alternating waveform. Beyond the conversion itself, modern inverters also monitor your system’s performance, tracking voltage and current from the panels and reporting how much energy you are generating through apps or built-in displays.
What does a solar inverter do?
The core job is converting DC from your solar panels into AC for your home, but modern inverters do a lot more than that.
Most inverters include Maximum Power Point Tracking (MPPT). This is an algorithm that continuously adjusts the electrical load to squeeze the most energy from your panels as light and temperature change throughout the day. A well-designed MPPT system can push conversion efficiency above 97%, meaning very little of the energy your panels capture is lost in the conversion process.
The inverter also handles safety. Grid-connected systems include anti-islanding protection, which automatically shuts the inverter down during a power outage so that electricity is not fed back into the grid while line workers may be repairing it. If you are considering residential solar installation, the inverter is one of the first decisions you will make because it determines how the rest of your system operates.
Types of solar inverters
Several types of solar inverters are used in Australian homes. The right one depends on your roof, your budget, and whether you want battery storage now or later.
String inverters
A string inverter connects a row (or “string”) of solar panels to a single central unit, usually wall-mounted near your switchboard. This is the most common and affordable option for homes with a straightforward, unshaded roof. The downside is that if one panel in the string underperforms because of shade, dirt, or a fault, it reduces the output of the entire string. If your roof faces north and gets full sun, a string inverter will do the job well.
Optimised string inverters
Power optimisers attach to each individual panel and feed into a central string inverter. Each optimiser independently adjusts the voltage and current from its panel, so one shaded or dirty panel does not drag down the rest. Brands like SolarEdge use this architecture. It costs more than a basic string inverter but less than microinverters, and it gives you panel-level monitoring so you can identify problems with individual panels early.
Microinverters
A microinverter sits behind each panel and converts DC to AC right at the source. Because every panel operates independently, shading or a fault on one has no effect on the others. Microinverters like the Enphase IQ series suit roofs with multiple orientations or partial shading. They typically carry longer warranties (up to 25 years) than string inverters. The tradeoff is a higher upfront cost per panel.
Hybrid inverters
A hybrid inverter combines a solar inverter and a battery inverter in one unit. It manages solar generation, battery charging and discharge, grid export, and household consumption all at once. If you want to add a battery now or in the future, a hybrid inverter means you will not need a separate battery inverter later. Popular hybrid models in Australia include the Fronius Gen24 Plus, Sungrow SH series, and GoodWe ES/EM range. If you want to expand your system later, a hybrid also saves you from needing additional hardware for solar system upgrades.
Grid-tied inverters
A grid-tied inverter connects your solar system to the mains electricity grid. It allows you to use solar power during the day, draw from the grid when your panels are not producing enough, and export surplus energy back to your retailer for a feed-in tariff credit. The vast majority of residential solar systems in Australia are grid-tied. Modern grid-tied inverters provide real-time monitoring and can adjust output to match grid requirements throughout the day.
Off-grid inverters
Off-grid inverters are for properties with no mains grid connection, like rural or remote homes. They work alongside a battery bank to supply AC power independently. Get the sizing wrong and you will run out of power, because there is no grid to fall back on during high demand or long stretches of cloud. Running a house entirely on solar power requires careful planning around battery capacity, panel output, and how much energy you use across the seasons.
How to choose the right solar inverter
Picking the right inverter comes down to a few practical questions about your property and energy goals:
- Roof and shading: A simple, unshaded roof suits a string inverter. If you have shade from trees or neighbouring buildings, split orientations, or a complex roof shape, optimisers or microinverters will get more from your solar panel setup.
- Battery plans: Planning to add battery storage for your home? A hybrid inverter saves the cost and hassle of retrofitting a separate battery inverter down the track.
- System size: Match your inverter capacity to your panel array. In Australia, you can oversize panels by up to 33% relative to inverter capacity (for example, 6.6 kW of panels on a 5 kW inverter). Choosing the right system size depends on your household consumption.
- CEC approval: Only install inverters listed on the Clean Energy Council’s approved product list. This is a requirement for claiming the federal Small-scale Technology Certificate (STC) rebate.
- Brand and warranty: Stick with brands that have Australian service and warranty support. Fronius, Sungrow, GoodWe, Enphase, and SolarEdge are all widely installed by Australian solar professionals and have local warranty networks.
How much does a solar inverter cost in Australia?
Inverter costs vary depending on the type (string, hybrid, or microinverter), the brand, the capacity you need, and your location. A basic string inverter for a standard residential system is the most affordable option, while hybrid inverters and microinverter setups cost more due to the additional hardware and functionality they provide. Your installer can provide a quote based on your specific system requirements. For a full breakdown, see our guide on how much a solar inverter costs.
Solar inverter lifespan and warranty
A string or hybrid inverter typically lasts 10 to 15 years, meaning you may need one replacement during the 25-year lifespan of your panels. Microinverters tend to last longer and often carry warranties that match the panels at 25 years.
Heat is what kills inverters fastest. Installing the unit in a shaded, ventilated spot rather than in direct afternoon sun can add years to its life. Regular solar system maintenance can catch early warning signs before a full failure occurs. If your inverter is showing error lights or beeping, it is worth looking into sooner rather than later.
Frequently asked questions
What is the difference between a solar inverter and a regular inverter?
Can I add a battery to my existing solar inverter?
How do I know if my solar inverter is working properly?
Do solar inverters work during a blackout?
Where should a solar inverter be installed?
How long does a solar inverter last?
For more information, see the Clean Energy Council solar inverter buyers guide and the Australian Government Small-scale Renewable Energy Scheme.