Few things confuse Perth solar owners more than hearing their system will be export limited. It sounds like a penalty. It sounds like the system has been deliberately held back. In practice it is neither. Understanding what an export limit does, and just as importantly what it does not do, makes the whole thing far less alarming.
This guide explains what export limiting actually is. It explains why Western Australia applies it. It covers what the 1.5 kilowatt figure means. It shows what it genuinely costs a household. It shows the straightforward way to make sure it barely matters at all.
Export Limiting Is Not the Same as Losing Power
This is the single most important point. An export limit restricts how much electricity a system is allowed to send out to the grid. It does not limit how much the household can use. It does not switch anything off inside the home. The panels keep generating. The home keeps drawing whatever it needs. Only the surplus heading out to the street is capped.
A household that uses most of its own solar as it is generated will barely notice an export limit at all. The limit only bites at the moments when a system is producing more than the home can consume. Even then it simply caps the overflow.
Why Western Australia Limits Exports
Western Australia has one of the highest rates of rooftop solar in the world. The South West Interconnected System that serves Perth is an island grid with no neighbouring states to lean on. On mild, sunny days when demand is low, an enormous amount of rooftop solar arrives at once. Too much of it, at the wrong moment, makes the grid harder to keep stable and secure.
Export limits are one of the tools used to manage that. Rather than restricting how many homes can install solar, the network manages how much can flow back at any given time. Seen that way, an export limit is what allows more households to keep connecting solar rather than fewer.
What Changed from 1 May 2026
From 1 May 2026, new and upgraded rooftop solar and battery systems connected to the South West Interconnected System must meet updated connection requirements. This includes all of Perth. Inverter capacity is capped at 15 kilowatts on a single-phase connection and 30 kilowatts on three phase. Every new inverter must take one of two paths.
| Pathway | What it means | Who it suits |
|---|---|---|
| A CSIP-AUS capable inverter | The system can be remotely curtailed if the grid ever needs it | Most homes; allows the full export capacity |
| A fixed 1.5 kW export limit | Exports are permanently capped at 1.5 kW | Systems that cannot support the communications standard |
The key thing to understand is that these are alternatives, not a combination. A modern, communications-capable inverter gives a household the full export allowance. The grid retains the ability to curtail in a genuine emergency. Only a system that cannot support that standard is capped at the fixed 1.5 kilowatt figure. Systems installed before 1 May 2026 are not affected by the new requirements.
These rules sit inside a broader set of changes to WA connection and commissioning requirements. They are worth reading alongside this guide if a system is being installed or upgraded now.
What an Export Limit Actually Costs You
Here is the part that reframes the whole question. Energy exported to the grid earns a feed-in tariff. In Western Australia that rate is modest. It is particularly modest during the middle of the day when most surplus occurs. Energy used inside the home avoids buying electricity at the full retail rate.
In other words, exported solar has always been the least valuable thing a system can do with its output. An export limit caps the least valuable part. For a household that uses its own solar well, the financial impact is small. For a household exporting heavily in the middle of the day, the answer is not to fight the limit. Instead, use more of that energy at home, where it is worth considerably more anyway.
How to Make an Export Limit Almost Irrelevant
Every strategy here has the same logic. Move consumption into the sunny part of the day. Or store the surplus instead of sending it out.
- Add a battery. Surplus that would have been exported, or capped, is stored instead. Use it through the evening peak. This is the single most effective answer to an export limit.
- Shift the big loads to the middle of the day. Pool pumps, dishwashers, washing machines and hot water can all run in the sunniest hours. Run them rather than at night.
- Charge the car on sunshine. A smart EV charger can soak up surplus solar that would otherwise be capped. Turn it directly into kilometres.
- Consider DC-coupled charging. Some equipment, including the SigEnergy DC EV charger, can take solar directly as DC power. This captures energy that an export limit would otherwise waste.
How Positive Energy Solutions Designs Around It
An export limit is not something to be surprised by after installation. It is a design input from the start. It shapes how a system should be sized. It shapes whether a battery makes sense. It shapes how the household should use its energy through the day. Positive Energy Solutions works with communications-capable inverters from Fronius, Sungrow and SigEnergy as a matter of course. Most systems take the full-capacity pathway rather than the fixed cap.
Every installation is completed by our accredited installers. It is signed off to Positive Energy Solutions’ completion standards. It is backed by a 10-year installation workmanship warranty and Positive Energy Protection, powered by Omnidian. The system is monitored from day one. Any genuine underperformance is separated from normal, expected export management.
Frequently Asked Questions
Does an export limit mean my solar stops working?
No. The panels keep generating and the home keeps using solar as normal. Only the surplus sent out to the grid is capped. The household sees very little difference.
What does the 1.5 kW export limit mean?
It is the fixed cap applied to systems that cannot support the CSIP-AUS communications standard. Exports to the grid are limited to 1.5 kilowatts. Self-consumption inside the home is unaffected. A communications-capable inverter avoids this cap.
Does this apply to my existing solar system?
No. The requirements that took effect on 1 May 2026 apply to new and upgraded systems from that date. An existing system continues under the rules it was installed under.
How do I avoid losing value to an export limit?
Use more of your own solar. A battery, load shifting into the middle of the day, and smart EV charging all convert surplus. That surplus would have been exported or capped. Instead it becomes savings worth far more than a feed-in credit.
Design the System, Not the Limit
Export limits are a permanent feature of solar in Western Australia. They are far less painful than they sound once a system is designed with them in mind. The households that barely notice are the ones using their own energy well.
Talk to the local team about a system designed for WA’s export rules: positiveenergy.com.au/contact/
About the Author
Jason Wiktorowicz
Sales Manager, Positive Energy Solutions | Perth, WA
Jason has been at the centre of Western Australia’s energy transition for over a decade. He was Orchestration Lead on Project Symphony. That is WA’s largest virtual power plant pilot. He was Stream Lead on Project Encore. He worked directly with AEMO, Western Power and Energy Policy WA. He shaped how distributed energy resources connect and operate on the SWIS. That work included developing and rolling out CSIP-AUS. It is now mandatory for all new WA grid connections. He also led Emergency Solar Management. It was the first program of its kind in WA. He led VPP for Schools. It provided direct market benefits through Supplementary Reserve Capacity. He led REBAR, the WA Residential Battery Rebate scheme.
His earlier career spanned Synergy, Infinite Energy and Curtin University’s Sustainability Policy Institute. He co-authored peer-reviewed research on net-zero urban precincts, solar integration and peer-to-peer energy trading. It was published in the journal Urban Planning in 2018.
At Positive Energy Solutions, Jason leads sales with a focus on system design accuracy and long-term performance. Positive Energy Solutions installs solar and battery systems, EV chargers and heat pumps. It holds partner accreditations with Fronius, SigEnergy, iStore and SunPower.
10-year installation workmanship warranty. Positive Energy Protection, powered by Omnidian, performance monitoring included on all systems.
