Many NSW solar quotes mention a 5 kW export limit. Here is what that limit means, why it is set per phase, how export control works, and why a panel array larger than the limit can still make sense. If your solar quote says "export limited to 5 kW", the installer is not holding your system back. The figure reflects the rules your local electricity network sets for how much power a home may send back into the street. In much of NSW, a typical single-phase home is commonly approved to export up to 5 kW, and installers design around that. Understanding the limit helps you check whether the panel size, inverter size and export settings on a quote actually fit together.
Why networks limit exports at all
The poles and wires in your street were built to deliver power to homes, not to absorb large amounts from rooftops at midday. When many homes export at once, local voltage rises. If it rises too far, inverters must reduce output or disconnect to protect the network, which means lost generation for everyone nearby.
To manage this, each distribution network sets connection rules covering how much inverter capacity may be installed and how much may be exported. The rules vary between networks and can depend on your supply type, the local transformer and whether your area is considered constrained. Your installer applies for connection on your behalf, and the approval sets the limit for your home.
What "5 kW per phase" means in practice
Many established Sydney homes have single-phase power. Some newer or larger homes, and many businesses, have three-phase power, which is effectively three supply lines. Limits are commonly expressed per phase, so a three-phase home may be permitted to export more in total, provided exports are reasonably balanced.
| Connection | How limits are commonly framed | What to look for in the quote |
|---|---|---|
| Single-phase | Export commonly capped around 5 kW | A single-phase inverter with export control set to the approved value |
| Three-phase | Limit applies per phase, so the total can be higher | A three-phase inverter or a design balanced across phases |
| Constrained area | A lower limit, or zero export, may be approved | The approved figure stated once known, not an assumed 5 kW |
The key point is that the limit applies to power crossing your meter into the grid, not to what your panels produce. Power used in the home at the same moment never counts as export.
How export control works
Export control is usually a small meter or a current transformer (CT) installed at your switchboard and connected to the inverter. The inverter watches how much power is flowing out and throttles its output if exports would exceed the approved setting. When the kettle or air-conditioner switches on, the inverter lifts output again straight away.
When comparing quotes, check that:
- The export limit is written down, with whether it is a soft limit (the inverter reduces output) or a hard limit (the inverter disconnects).
- The export control meter or CT appears in the price and on the single-line diagram.
- The inverter supports export limiting and will be configured and tested at commissioning. Quality inverters from brands such as GoodWe, Fox ESS, Sungrow and Sigenergy offer this with a compatible meter.
- The quote says who applies to the network and when approval is expected.
The market on this site lists a Smart Energy Meter from $490 (indicative, confirmed after a site assessment), the type of device used for inverter or battery export control and sub-metering.
Why a larger panel array can still suit a 5 kW limit
Many buyers are surprised that a 6.6 kW panel array is often paired with a 5 kW inverter. This is deliberate. Panels rarely produce their full rated output, because heat, dust, pitch and orientation all reduce real output, so a moderately larger array keeps the inverter busier through mornings, afternoons and winter. Array-to-inverter ratios of around 1.1 to 1.33 are common, and there are limits on oversizing for a system to remain eligible for STCs, which a compliant designer stays within. The inverter buyer's guide covers matching inverter and array sizes.
Where the network allows it, export control can also let you install an inverter larger than the export limit. The extra capacity serves your own daytime loads and any battery, while exports stay capped. On a clear spring day some generation may be curtailed around midday, but across the year the gain often outweighs it. Ask the installer to show estimated curtailment in the yield estimate rather than leaving it out.
Getting value from power you cannot export
An export limit is a good reason to use more of your solar yourself. Feed-in tariffs in NSW are commonly only a few cents per kWh, far below the 30-45 c/kWh commonly paid for grid electricity, so a kilowatt-hour used at home is usually worth much more than one exported. Options include:
- Running the dishwasher, washing machine and pool pump in the middle of the day.
- Heating water with surplus solar using a timer, a diverter or a heat pump scheduled for daylight hours.
- Charging an EV with a charger that follows your solar surplus.
- Adding a battery, where a hybrid inverter becomes relevant; the hybrid vs string comparison explains the trade-offs.
Flexible exports, in general terms
Networks in Australia are moving towards flexible or dynamic export arrangements. Instead of a fixed cap all year, the allowed export can rise when the local network has spare capacity and fall when it is congested, with the inverter receiving updated limits over the internet. Availability, terms and the inverter features required differ between networks and are still developing, so do not rely on a specific figure mentioned in a sales pitch. It is reasonable to ask whether the proposed inverter can support dynamic export limits and whether firmware updates are provided.
Questions to ask about export limits
- What export limit has been assumed, and is it confirmed or awaiting network approval?
- Is my supply single-phase or three-phase, and would a phase upgrade change the design?
- How much generation is expected to be curtailed each year?
- Is export control included in the price and shown on the diagram?
A phase upgrade is a significant job involving network approval and a meter change. The market lists a Single-Phase to Three-Phase Upgrade from $3,490 (indicative, confirmed after a site assessment), and it is only worth it when your loads or plans justify it.
Next steps
Put the export limit, inverter size and panel capacity from each quote side by side and make sure all three make sense together. For a design based on your actual connection and roof, you can request a free assessment from Blue Energy Solar, and browse export meters, diverters and related services in the market.
Frequently asked questions
Does an export limit reduce what I save on my bills?
For most homes, only slightly. The limit caps power flowing to the grid, not power used in the house, so the energy you use directly is unaffected. What you may lose is some midday export on sunny days when generation exceeds your usage plus the limit. Because feed-in tariffs are commonly only a few cents per kWh, that curtailed export is typically worth far less than the solar you use yourself.
Can I ask my network for a higher export limit?
Your installer applies on your behalf, and the network decides based on its connection rules and local conditions. In some cases a three-phase supply or a flexible export arrangement allows more export, but approval is not automatic and requirements vary between networks. Ask your installer what was applied for, what was approved and whether any alternative arrangement is available in your area.
What happens to my export limit if I add a battery later?
Adding a battery usually needs a new or updated network application, because the total inverter capacity at the property changes. The export limit generally still applies to power leaving the property, whether it comes from the panels or the battery. A battery can soak up generation that would otherwise be curtailed. Ask the installer to confirm how existing export settings will be reconfigured.
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