Panels get all the attention on a solar quote, but the inverter is the part that does the thinking. It converts DC from your panels into AC your house can use, manages the grid connection, and, if you have a battery, decides when to charge and discharge it. It's also the part most likely to fail first. Panels routinely outlive the inverter that runs them.
So which inverter is best? The honest answer annoys people.
There is no single best solar inverter in Australia. The best one is the right type for your system, from a brand with solid Australian support, sized and installed properly. For a plain grid-tied system, a quality string inverter such as Fronius, SMA or Sungrow is hard to beat. If a battery is in the plan, a hybrid such as Deye, Sungrow, GoodWe or Sigenergy is usually the better buy. For off-grid, Selectronic and Victron are the names we trust. Type first, then brand.
This guide covers the inverter types, the brands we actually install, and what to check on any quote.
What type of solar inverter do you need?
Get the type right and most brand decisions become easy. Get it wrong and no brand will save you.
| Type | What it does | Best for | Watch out for |
|---|---|---|---|
| String inverter | One central inverter converts DC from strings of panels to AC | Grid-tied homes with a simple, mostly unshaded roof and no battery yet | One shaded or faulty panel affects its whole string; adding a battery later means AC-coupling or a swap |
| Hybrid inverter | Runs the panels and a battery on one inverter (DC-coupled) | New solar with a battery now or soon; replacing a failing inverter when a battery is planned | Must be paired with a compatible battery; backup depends on the model and how it's wired |
| Microinverters | A small inverter on each panel | Complex, multi-face or partly shaded roofs | More electronics on the roof; adding a battery means AC-coupling a separate system |
| Off-grid inverter / inverter-charger | Forms its own grid, manages batteries and a generator, no network connection | Properties with no grid, or where connection is uneconomic | Must be designed for your worst week of weather, not an average day |
String inverter solar panels: still the default for a reason
A string inverter is the simplest, cheapest-to-maintain option for a typical grid-tied home. Panels are wired in series into strings, the strings run to one inverter on a wall, and that's it. There's one box to service, one box to replace, and it's at ground level.
The weakness is that a string behaves like Christmas lights: shading on one panel drags down the others in that string. On a clear, north-facing roof this barely matters. On a roof with a chimney, a tree and three faces, it does.
Hybrid inverters: the right call when a battery is coming
A hybrid inverter connects both the panels and the battery. Solar DC charges the battery directly with one conversion step, which is more efficient than AC-coupling, and you have one warranty point of contact instead of two.
Our rule of thumb:
- New solar and a battery together: hybrid, DC-coupled.
- Existing inverter healthy and under 8 years old: keep it, AC-couple a battery alongside.
- Existing inverter failing, out of warranty, or you're expanding the array: replace it with a hybrid.
The catch is that hybrid and battery have to talk to each other properly. Matched brand-to-brand it's usually plug and play. Mixed brands means a compatibility list and firmware versions, which is where poorly planned installs come unstuck.
Microinverters
Microinverters put a small inverter behind each panel, so each panel works independently. On complicated or shaded roofs that's a genuine advantage, and you get panel-level monitoring. Enphase is the name most people know, and it is one of the inverter brands we work with.
The trade-off: more electronics on the roof, in the heat, and adding a battery means a separate AC-coupled system. If you have an Enphase system you're happy with, staying in that ecosystem is usually cleaner than fighting it.
Off-grid inverters
Off-grid is a different design discipline. The inverter has to form a stable grid on its own, manage a large battery bank, start a generator when needed, and handle surges from pumps and compressors with no network behind it. This is where Selectronic and Victron live.
The inverter brands we install, and what each is best for
We're not tied to one supplier, so this is the same rundown we'd give you across the kitchen table. No efficiency figures here: datasheet numbers between quality brands are close enough that they shouldn't decide your purchase. Fit, support and installation quality do.
Fronius
An Austrian brand with a long track record in Australian homes. Fronius string inverters are what we fit when someone wants a straightforward grid-tied system they'll never have to think about.
Best for: premium grid-tied systems without a battery, or with a battery to be AC-coupled later. Less ideal for: buyers who want a battery on day one at the lowest cost, where a value hybrid makes more sense.
SMA
A German brand and one of the longest-established names in solar inverters. Similar positioning to Fronius: premium, conservative engineering, good for a system you want to set and forget.
Best for: premium grid-tied homes, and owners who value a long-established brand. Less ideal for: tight budgets.
Sungrow
A Chinese manufacturer with a wide range of string and hybrid inverters and its own battery line (the SBR series, which we fit at 9.6 to 25.6 kWh). Excellent value, with a mature Australian support network.
Best for: value-conscious buyers who still want a major brand, and new systems pairing a Sungrow hybrid with a Sungrow battery. Less ideal for: buyers who'd rather pay for a European badge.
Deye
Deye hybrids are our default when a battery goes in with new solar on most Sunshine Coast homes. They come in single and three-phase versions, pair with Deye's high-voltage battery modules, and deliver strong backup. Our full Deye battery review covers the range.
Best for: solar and battery systems where value, expandability and real backup matter, including three-phase homes. Less ideal for: buyers set on a specific VPP program, since Deye's coverage on approved-device lists is thinner, and anyone whose installer doesn't know the product well. Deye rewards careful commissioning.
Sigenergy
An all-in-one stack: hybrid inverter, battery modules and EV charging in a single cabinet, with modules stacking from roughly 8 to 48 kWh. The premium end of what we fit.
Best for: the tidiest possible install, larger batteries, and anyone planning EV charging. Less ideal for: budget-first buyers or small batteries.
GoodWe
GoodWe makes both string and hybrid inverters and is a solid choice in the middle of the market.
Best for: buyers wanting a capable hybrid or string inverter without premium-brand pricing. Less ideal for: anyone who wants a single-ecosystem inverter, battery and EV charger package.
Selectronic
Australian-made off-grid and hybrid inverters, and the backbone of a lot of serious off-grid systems in Queensland. Built for properties where the inverter is the grid.
Best for: off-grid homes and rural properties, and grid-connected homes that want genuinely robust backup. Less ideal for: simple grid-tied systems, where it's more inverter than you need. Our Selectronic SP PRO review goes into detail.
Victron
A Dutch brand known for battery-based and off-grid power systems. Highly configurable and modular, which is its strength and its demand: it needs a designer who knows it well.
Best for: custom off-grid and backup builds, and systems with unusual requirements. Less ideal for: standard grid-tied homes that just want solar on the roof.
Fronius vs Sungrow: which is better?
This is the comparison we're asked about most, because they're the two names that turn up on competing quotes.
| Fronius | Sungrow | |
|---|---|---|
| Origin | Austria | China |
| Positioning | Premium | Value |
| Strength | Long track record in grid-tied string inverters | Wide range of string and hybrid inverters, plus its own battery |
| Battery path | Often AC-coupled later on a grid-tied install | Sungrow hybrid with Sungrow battery is a clean all-in-one path |
| Australian support | Established | Mature support network |
| Who should buy it | Grid-tied, no battery planned, wants the premium badge | Battery now or soon, or value matters |
Neither is a bad choice. If there's no battery in your plans and you want to pay for a premium European inverter, Fronius. If a battery is coming or budget matters, Sungrow, and you'll put the saving towards the battery.
Why there's no "top 10 solar inverters in Australia" list here
Plenty of sites publish a top 10. Most of them rank by affiliate commission or by datasheet numbers that sit within a whisker of each other. A ranking that puts brand number four above brand number five tells you nothing about your roof.
What actually separates a good inverter purchase from a bad one:
- Right type. A string inverter on a roof that needed micros, or a non-hybrid on a house that's getting a battery next year, is the expensive mistake.
- Australian support. Several manufacturers have left the Australian market entirely, which means no parts and no warranty claims. A brand with a local distributor and a track record here matters more than a datasheet figure.
- Approved for connection. The model has to be on the approved list and meet AS/NZS 4777.2 for grid connection.
- Correct sizing. Arrays are commonly sized larger than the inverter, which is normal, but the ratio and the phase have to suit your connection. What the network allows at your address is confirmed at application.
- Installed and commissioned properly. Grid protection settings, firmware, battery comms and backup circuits are all invisible on handover day and all matter.
What to check on any inverter quote
- Exact model number, so you can check it's the current version and on the approved list
- Warranty term and who honours it. Is it the manufacturer through an Australian distributor? Is labour covered or just the part?
- Battery compatibility, if a battery is anywhere in your plans
- Single or three-phase, and whether it matches your connection
- Monitoring, and whether it works on your Wi-Fi without a second app
- VPP compatibility, if you want to join a particular program
When your current inverter dies
Inverters usually fail before panels, and many systems installed in the 2011 to 2013 rebate wave are on their second inverter or due one. When yours goes, like-for-like isn't always the right replacement. If a battery is anywhere in your plans, swapping to a hybrid at the same time avoids paying for an inverter twice. Our guide to solar inverter replacement covers the options.
For new systems, inverter selection is part of every residential solar installation we design. We'll tell you which type suits your roof and plans, and why, before we talk brands.
Frequently asked questions
What is the best solar inverter in Australia?
There isn't one best inverter for every home. For a grid-tied system with no battery, a premium string inverter such as Fronius or SMA, or a value option like Sungrow, is a strong choice. With a battery, a hybrid such as Deye, Sungrow, GoodWe or Sigenergy usually makes more sense. Off-grid, we use Selectronic and Victron.
What is the difference between a string inverter and a hybrid inverter?
A string inverter converts solar DC to AC for your home and the grid. A hybrid does that and also manages a battery on the same unit, so solar can charge the battery directly. If a battery is in your plans, a hybrid is usually the better buy.
Is Fronius better than Sungrow?
Fronius is the premium choice with a long record in grid-tied string inverters. Sungrow offers better value and a broad range of hybrids with its own batteries. For a grid-tied system with no battery planned, Fronius is hard to fault; if a battery is coming or budget matters, Sungrow is often the smarter buy.
Do I need a hybrid inverter to add a battery?
No. If your existing inverter is healthy and under about 8 years old, a battery can be AC-coupled alongside it. A hybrid makes sense when you're installing new solar and a battery together, or when your existing inverter is failing anyway.
How long does a home solar inverter last?
Inverters are usually the first major component to fail, well before the panels. That's why the warranty terms, the brand's Australian support and an annual inspection matter, especially on coastal homes and systems over ten years old.
