Perth homeowner guide · Reviewed August 2026
WA Solar Rules 2026: What Perth Homeowners Need to Know
The WA solar rules changed on 1 May 2026 for new and upgraded solar and battery systems in the South West Interconnected System, including Perth. Standard connections can now accommodate up to 30 kVA of aggregate inverter capacity, but generation and export limits still apply. Systems using an export arrangement above the 1.5 kW static base pathway must support the required remote functionality, and applicable inverters must be commissioned to AS/NZS 4777.2 using Australia Region B.
Australis Solar is Perth-based and WA-owned, operating since 2008. We design solar, battery, backup and EV charging systems around your Synergy bill, existing equipment, roof, switchboard, energy use and future plans.
The short version
What did the WA solar rules change on 1 May 2026?
The changes affect new or upgraded inverter energy systems connected to Western Power's SWIS network where the aggregate inverter capacity is up to 30 kVA. They create more room for larger solar and battery configurations while introducing consistent requirements for export management, communications and inverter commissioning.
Up to 30 kVA aggregate inverter capacity
The 30 kVA figure includes the combined rated capacity of relevant solar, battery and other inverter energy systems at the connection. It is not the amount a home can automatically export to the grid.
Remote management or the static export pathway
Systems using retailer export arrangements above the static 1.5 kW pathway need the required communications and remote disconnect/reconnect capability. A fixed 1.5 kW export pathway remains available where appropriate.
Correct inverter commissioning
Inverters must comply with the applicable AS/NZS 4777.2 requirements and use the Australia Region B grid settings. Other electrical, PV, battery and Western Power requirements continue to apply.
The most important distinction
WA solar rules: 30 kVA does not mean 30 kW of export
Three separate figures can apply to a Perth solar or battery design: aggregate inverter capacity, the site generation limit and the export limit.
Confusing these numbers can result in a system being specified very differently from the way it is actually allowed to operate.
| Connection | Maximum aggregate inverter capacity | Generation limit | Static base export | Published maximum export* |
|---|---|---|---|---|
| Single-phase | 30 kVA | 15 kVA | 1.5 kW | 5 kW |
| Three-phase | 30 kVA | 8 kVA per phase | 1.5 kW | 5 kW |
Western Power Table 4.1 figures for Large LV Networks, the network category typical of metropolitan Perth. Small LV networks have different generation and export limits and require technical assessment. *A higher maximum export may be permitted where specifically agreed with the electricity retailer under the applicable arrangements.
New system, upgrade or existing installation?
How do the WA solar rules affect your existing system?
If your solar or battery system was installed before 1 May 2026 and you are not modifying it, the new requirements generally do not require you to retrofit the system. The situation changes when inverter energy system equipment is upgraded, added or materially modified.
No upgrade planned
A compliant system installed before 1 May 2026 can generally continue operating under its existing arrangements. You do not need to replace working equipment simply because the new rules commenced.
Adding a battery, inverter or additional generation
An upgrade can bring the site under the current connection requirements. The retained equipment and proposed new equipment need to be assessed as a complete system before the design is finalised.
Warranty replacement
A similar or exact inverter replacement completed under warranty can qualify for an exemption from the new functionality requirement. The actual replacement and approval pathway still need to be checked before work proceeds.
Export arrangements
How the 1.5 kW export limit, internet connection and DEBS fit together
Western Power connection limits and Synergy's electricity buyback rules are related, but they are not the same thing. A system being technically permitted to include up to 30 kVA of aggregate inverter capacity does not automatically make that entire capacity eligible for DEBS or allow it to export at that level.
Export arrangement with remote functionality
For affected Synergy installations using the managed pathway, the system is designed and commissioned to meet Synergy's DER Functionality Requirements, including the required communications capability.
- Internet or the required communications pathway is established.
- Compatible equipment and whole-of-site operation are checked.
- Synergy uses CSIP-AUS for its implementation.
- Actual permitted export still depends on the approved retailer and network arrangement.
Fixed 1.5 kW export
A customer who does not want, or cannot reliably maintain, the required communications can use the static base export pathway where applicable.
- Grid export is limited to no more than the applicable 1.5 kW static base limit.
- The home can still consume its own solar energy behind the meter.
- A battery can still store available surplus energy subject to system design.
- Do not assume the static pathway remains eligible for a particular Synergy buyback product.
What this means in practice
The WA solar rules make good system design more important, not less
The ability to install more inverter capacity gives Perth homeowners more flexibility, particularly when solar, battery storage and future EV charging are considered together. But inverter size alone does not determine whether the system is suitable.
Solar and battery capacity
Australis Solar considers your actual consumption, available daytime solar surplus, evening demand and inverter architecture before deciding how much PV and battery capacity makes sense. Compare solar battery options →
Export and self-consumption
A large PV array can still make sense where energy can be consumed onsite, stored or used for major daytime loads. A design should not rely solely on exporting large amounts of surplus solar.
Blackout backup
Emergency Solar Management is not blackout protection. Backup requires compatible inverter and battery hardware, compliant isolation and switching, sufficient output and a deliberate decision about which household circuits will be supported.
Future EV charging
An EV can materially increase daytime or overnight electricity demand. Solar capacity, battery charging, switchboard demand and the proposed EV charger should be considered together. Explore EV charger installation →
Designed around your property
How Australis Solar assesses a solar or battery upgrade
Australis Solar does not select a system from the inverter limit alone. We assess the property, existing electrical equipment and how you actually expect to use the energy.
- Your recent Synergy bill and available interval usage data
- Current solar panel and inverter capacity
- Roof orientations, usable area and shading
- Single-phase or three-phase connection
- Switchboard, consumer mains and protection
- Existing export and metering arrangements
- Battery location and installation clearances
- Backup circuits and expected outage loads
- Future EV charging or electrification plans
- Current Western Power and Synergy requirements
Send us the existing system details
Provide your Synergy bill, inverter details, switchboard photos, property information and what you want the upgraded system to achieve.
We check the connection and existing equipment
We review phase, inverter capacity, retained equipment, export arrangement, switchboard requirements and whether the proposed upgrade triggers current connection requirements.
We design around actual usage
Solar, battery capacity, inverter output, backup scope and future EV requirements are considered together rather than treated as separate products.
Approval, installation and commissioning
The approved system is installed by our in-house team and commissioned to the applicable electrical, network, retailer and manufacturer requirements.
Local design, installation and support
Why choose Australis Solar for a Perth solar or battery upgrade?
Australis Solar is a Perth-based, WA-owned solar company operating since 2008. We design, install and maintain custom solar, battery storage, blackout backup and EV charging systems using accredited in-house installers and licensed electricians.
Our recommendations are designed around your Synergy bill, actual usage, roof, shading, existing inverter, switchboard, battery requirements, backup expectations and future energy plans.
Local experience with Western Power, Synergy and Perth residential electrical requirements.
System capacity and architecture are based on the property and household rather than a standard package.
Accredited in-house installers and licensed electricians work from the approved system design.
Battery storage, blackout requirements, EV charging and future upgrades can be considered before equipment is selected.
Perth homeowner questions
WA solar rules frequently asked questions
What are the WA solar rules from 1 May 2026?
Can I install more than a 5 kW inverter in Perth now?
Does 30 kVA mean I can export 30 kW to the grid?
Do the new rules affect my existing solar system?
If I add a battery after 1 May 2026, does my existing solar need to comply?
What happens if my inverter or gateway loses its internet connection?
Is Emergency Solar Management the same as blackout backup?
Do the new rules change DEBS eligibility?
Perth solar and battery advice
Planning solar, a battery or an inverter upgrade?
Send Australis Solar your latest Synergy bill and details of your existing system. We will assess the connection type, current inverter and panels, switchboard, energy usage, battery or backup requirements, export arrangement and future EV plans before recommending a system.
Perth-based and WA-owned since 2008 · Accredited in-house installers · Licensed electricians