Fronius. Austrian-engineered inverters.

Fronius is a premium Austrian string and hybrid inverter brand, and for simple, unshaded roofs it is one of our top choices. The Austrian-made Symo and Primo string ranges are built on Fronius's SnapINverter technology, where one inverter handles the entire array, and the GEN24 Plus hybrid family keeps a clean battery path open for later. Because Mission Green installs a range of other inverter and battery brands too, a Fronius recommendation from us is a design decision, not a sales quota: if your roof has heavy shading or awkward orientations, or you want a specific all-in-one battery ecosystem, another inverter — or microinverters — can be the better design, and that's the answer you'll get at a free assessment before you pay anything.

Usually, yes — and there are two honest pathways. If your Fronius is a compatible hybrid inverter, a DC-coupled modular battery such as the BYD Battery-Box HVM can pair with it directly — the same pairing BYD supports with compatible hybrids from Fronius, GoodWe or SMA. If your Fronius is a string inverter without a battery port, an AC-coupled battery such as the Tesla Powerwall 3 can sit alongside it: your Fronius keeps running the solar side while the battery handles storage independently, with no inverter replacement required. Which pathway suits you depends on your exact model, its age and condition, your switchboard and your evening usage, so we confirm it from your actual setup at a free assessment. The federal Cheaper Home Batteries Program — which cuts around 30% off an eligible installed battery, delivered as STCs applied at the point of sale, current as at 2 July 2026 — applies to both paths. And sometimes the honest answer is that a retrofit doesn't stack up yet; we'll tell you that too.

A red light or fault code is your Fronius doing its job — it has noticed something outside safe operating limits, stopped exporting and logged a state code on its display or in the monitoring app. The same light can mean different things: causes range from grid voltage outside limits and a tripped breaker — cheap or free to resolve — through to isolation faults that need a licensed professional. Note the exact code first: some checks, like confirming your solar supply main switch is on, are safe to do yourself, but anything involving wiring, DC isolators or a fault that keeps returning is not a DIY job. Mission Green diagnoses and services Fronius systems, including systems we didn't install and systems whose original installer has since stopped trading — and if the honest answer is that it's fine and needs nothing, that's the answer you'll get.