Which SolaX inverter suits my home?

It comes down to your power supply. A single phase home gets the X1-VAST, in 5, 6, 8 or 10 kW. A three phase home gets the X3-HYB-G4 PRO, from 4 to 15 kW, or the X3-ULTRA, from 15 to 30 kW, which SolaX makes for businesses as well as homes. The size then depends on your roof, your power use and the battery you want. We check your switchboard before we quote.

Do I need a battery for backup power?

Yes. SolaX rates the backup output of all three inverters with a battery connected, so plan on a battery if keeping the power on in a blackout matters to you. The inverters have two battery ports, so you can start smaller and add battery modules later.

Will a SolaX inverter keep the power on in a blackout?

With a SolaX battery, yes. It switches over by itself in under 10 milliseconds and runs the house from solar first, then the battery. It can back up the whole home or chosen circuits, up to its own size at once and twice that for 10 seconds to start motors. In the everyday Self use mode it won't switch to backup if the battery is already down at its minimum with no sun, so SolaX suggests Backup mode when an outage is likely, such as before a storm.

How many solar panels can a SolaX inverter take?

SolaX allows up to twice the inverter's size in panels: up to 20 kW of panels on a 10 kW X1-VAST, 30 kW on a 15 kW X3-HYB-G4 PRO and 60 kW on a 30 kW X3-ULTRA. How much you actually fit depends on your roof and on what Energex approves for your connection.

Can a SolaX inverter go outside?

Yes. All three are IP66 rated, which means sealed against dust and strong jets of water, and SolaX rates them to run from −35 to 60°C. Above 45°C they turn their output down to protect themselves.

What warranty do SolaX inverters have?

10 years on the X1-VAST, X3-HYB-G4 PRO and X3-ULTRA, from installation or 129 months from manufacture if that comes first, under SolaX's Australian warranty terms. SolaX's terms ask for the system to be registered with SolaX after it's commissioned.

SolaX

SolaX Hybrid Inverters

Q: Can my electric car power the house through a SolaX inverter?

With SolaX's Binary charger and a car that has vehicle-to-load (V2L), yes. The charger takes power from the car and feeds it through the inverter to run the house, including in a blackout. SolaX confirms the X1-VAST and X3-HYB-G4 PRO. For the X3-ULTRA, SolaX says support is on the way, so ask us whether it's available yet.

SolaX hybrid inverters run your solar panels, a SolaX battery and your backup power from one box: the X1-VAST for single phase homes, and the X3-HYB-G4 PRO or the larger X3-ULTRA for three phase. They are also what connects SolaX's Binary vehicle-to-home charger to your house.

Hybrid5 – 10 kW single phase, 4 – 30 kW three phase10-year warranty

Key Features

X1-VAST, single phase: 5, 6, 8 and 10 kW, with three solar inputs (MPPTs) on the 5 and 6 kW and four on the 8 and 10 kW
X3-HYB-G4 PRO, three phase: 4, 5, 6, 8, 10, 12 and 15 kW, with two or three solar inputs
X3-ULTRA, three phase: 15, 19.9, 20, 25 and 30 kW, which SolaX makes for businesses as well as homes
Up to 200% solar oversizing on all three: up to twice the inverter's size in panels, such as 20 kW of panels on a 10 kW X1-VAST
Pairs with the SolaX HS51 battery (5.1 kWh modules). SolaX says an X1-VAST takes up to eight of them (40.9 kWh)
Two battery ports, so storage can be added later
Switches to backup in under 10 milliseconds. On backup it supplies up to its own size, and twice that for 10 seconds to start big appliances. Backup needs a battery connected
The X1-VAST is designed to back up the whole home, up to 63 A, without extra devices
Works with SolaX's Binary vehicle-to-home charger: the X1-VAST and X3-HYB-G4 PRO now. For the X3-ULTRA, SolaX says support is on the way, so ask us
IP66 rated, and SolaX rates all three to run from −35 to 60°C (above 45°C they turn their output down to protect themselves)
Every size of all three that SolaX lists for Australia is on the Clean Energy Council's approved inverter list
10-year SolaX warranty on all three

Which SolaX inverter, and what it does

If your home is single phase, it's the X1-VAST. If it has three phase power, it's the X3-HYB-G4 PRO, or the X3-ULTRA for a bigger property. We check your switchboard before we quote.

Each one is a hybrid: it runs your solar panels, a SolaX HS51 battery and your backup power from the one box, and it has two battery ports, so storage can be added to later.

It is also the link for SolaX's Binary charger. The charger charges your car from your solar, and with a car that supports vehicle-to-load (V2L), it can send power from the car back through the inverter to run the house, including in a blackout. That works with the X1-VAST and X3-HYB-G4 PRO now. For the X3-ULTRA, SolaX says support is on the way, so ask us whether it's ready yet.

What it does in a blackout

When the grid fails, the inverter switches to backup by itself in under 10 milliseconds and runs the house from your solar and battery, solar first. You need a battery for this: SolaX rates the backup output with a battery connected.

SolaX's Australian wiring guides for all three inverters show whole-home backup, where the whole switchboard stays on, or partial backup, where only the circuits you choose do. The backup output is the inverter's own size, with twice that for 10 seconds. That short boost matters: SolaX notes fridges draw three to five times their running power to start, and air conditioners three to six.

In SolaX's everyday Self use mode the battery runs down to its set minimum, and from there the inverter won't switch to backup if the grid then fails. Backup mode keeps more charge in reserve, and SolaX suggests switching to it before an outage you can see coming. SolaX also says medical equipment must not be connected to the backup supply.

The three SolaX inverters side by side

The big difference is your power supply: single phase or three phase. After that it's size, which we match to your roof, your power use and your battery.

Specification	X1-VAST	X3-HYB-G4 PRO	X3-ULTRA
Power supply	Single phase	Three phase	Three phase
Sizes	5, 6, 8, 10 kW	4, 5, 6, 8, 10, 12, 15 kW	15, 19.9, 20, 25, 30 kW
Most panels	20 kW on the 10 kW model	30 kW on the 15 kW model	60 kW on the 30 kW model
Solar inputs (MPPTs)	3 or 4	2 or 3	2 or 3
Backup output	Its own size, twice that for 10 seconds	Its own size, twice that for 10 seconds	Its own size, twice that for 10 seconds
Switch to backup	Under 10 ms	Under 10 ms	Under 10 ms
Backup wiring	Whole home (up to 63 A) or chosen circuits	Whole home or chosen circuits	Whole home or chosen circuits
HS51 battery	Up to 8 modules (40.9 kWh)	2 to 13 modules per battery port	At least 3 modules
SolaX Binary car charger	Works with it	Works with it	On the way: ask us
Size and weight	590 × 400 × 180 mm, about 28 kg	560 × 503 × 210 mm, 38 kg	696 × 526 × 240 mm, 46 to 48.5 kg
Weatherproofing	IP66	IP66	IP66
Warranty	10 years	10 years	10 years

Solar inputs (MPPTs) let panels facing different directions each work at their best. Backup output is SolaX's rating with a battery connected; the 10-second boost is what gets motors such as fridges and air conditioners started.

Source: SolaX datasheets (Australia): X1-VAST V1.61, X3-HYB-G4 PRO V2.9, X3-ULTRA V2.6; SolaX user manuals (backup wiring for Australia); SolaX X1-VAST + HS51 article (20 Mar 2026); SolaX Australia, V2X explained (10 Sep 2026); SolaX warranty terms (Australia) V1.6.

Datasheet & warranty

Common Questions

Questions about the SolaX Hybrid Inverters

The full guideHow a SolaX battery system works

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