The Western Power/Synergy table above explained.

Many people aren't sure whether their home has single phase power or three phase.
If you can see three fuses under (or over) your meter and your 'Main Switch' is 3 poles wide
as shown in the picture below, then you have 3 phase supply. If not, it's single phase.


Single phase
The largest solar inverter you will be allowed under changes expected July 1st 2025 is 10kW.
In most cases the inverter will need to be export limited to 5kW.
A 5kW inverter (and smaller) will not require export limiting obviously.
Export limiting is achieved by installing the inverter 'smart meter' at a cost typically around $400.

There can be two or more inverters as long as the total stays at 10kW or below and export limiting is achieved.
This might be for example a 5kW solar existing inverter and panels and a second 5kW inverter, AC Coupled with a battery, with/without panels.

In addition to the 10kW solar inverter allowance, you can have up to 10kW of 'battery only' inverter(s).
There aren't too many 'battery only' inverters on the market.
Tesla Powerwall 2 was a battery only inverter but that has been superseded by Powerwall 3 which is a hybrid inverter.
Franklin is reportedly a good quality 'battery only' alternative to Powerwall 2 although we haven't installed any.
There are some 'cheaper' ones too from Alpha ESS (G3 B5) and Growatt (XA models).

At the moment Synergy restrict payment of DEBs (feed in tariff) to inverters 5kW and below only.


Three phase
You are allowed 15kW of solar inverter(s).
Any combination of three phase 'solar only' and 'solar & battery (hybrid) inverter is permitted up to 15kW.
In addition you can have a further 15kW of 'battery only' inverters.
Those additional inverters cannot have the capability to connect solar panels.
It must be 'battery only' as described above.

You can also install up to 10kW single phase hybrid inverters on three phase, as long as they have a DC Coupled battery connected.

The export limit for 3 phase installations will be 5kW (previously 1.5kW).