Connecting Solar and Export Limits in South Australia

Key Takeaways

• In South Australia, SA Power Networks (SAPN) categorises solar systems by total inverter capacity into Small, Medium, and Large Embedded Generation.
• The connection process and export limits for your solar system are determined by its size category.
• For small systems, Flexible Exports allows dynamic adjustment of solar exports up to 10kW per phase, but requires an internet-connected inverter.
• If you are installing or upgrading a solar system in South Australia, an accredited installer or electrical consultant must manage the connection application process with SAPN.

Understanding Solar Export Limits in South Australia

In South Australia, if you are connecting a new solar power system or upgrading an existing one, your ability to export surplus electricity back to the grid is managed by SA Power Networks (SAPN). SAPN is the electricity distribution network service provider for South Australia. The rules and processes described here apply specifically to connections within the SA Power Networks distribution area. Other states in Australia have different distribution networks and their own unique rules; you can find your distributor's name on your electricity bill.

Solar export limits are put in place to ensure the stability and safety of the electricity network. When a large amount of solar energy is exported to the grid, especially during periods of low energy demand, it can create an imbalance between supply and demand. This imbalance can lead to network instability and potentially cause unplanned power outages. By managing export levels, SAPN aims to prevent these issues and maintain a reliable electricity supply for all customers.

How Embedded Generation Size Classes Affect Your Connection

SA Power Networks classifies solar installations, referred to as "embedded generation," into different size categories based on their total inverter capacity. These categories determine the specific application process and the export limits that apply to your system. Understanding your system's size class is the first step in navigating the connection process.

The three main size classes are:

• Small Embedded Generation: For systems with a total inverter capacity no greater than 30kVA.
• Medium Embedded Generation: For systems with a total inverter capacity between 31kVA and 500kVA.
• Large Embedded Generation: For systems with a total inverter capacity greater than 500kVA, and all rotating generator systems. Systems greater than or equal to 5MW have additional requirements under the National Electricity Rules.

Each class has a distinct application and approval pathway, designed to assess the system's potential impact on the local network.

South Australian Embedded Generation Connection Processes

The connection process for your solar system in South Australia depends on its embedded generation size class. All applications are typically managed through "The Portal," an online system used by solar retailers and installers.

Flexible Exports and Fixed Export Options

For Small Embedded Generation systems in South Australia, you generally have two main options for managing your exports:

1. Flexible Exports: This is a world-first smart solar technology that allows dynamic adjustment of solar exports up to 10kW per phase. It became a standard service offering for new and upgrading small embedded generation solar customers in eligible areas from 1 July 2023. Any exporting solar system installed from this date must be compatible with Flexible Exports. This option requires an internet-connected inverter to allow for automatic adjustments, optimising the amount of solar energy that can be exported to the grid. If your internet connection is lost, solar exports will ramp down to 1.5kW until the connection is restored. The actual export capacity can vary based on network conditions and other factors, meaning some sites may not always reach the full 10kW per phase.
2. Fixed Export Limit: If you do not opt for Flexible Exports, you can choose a fixed export limit, which is typically either 0kW or 1.5kW, depending on your specific area and network conditions.

The Australian Energy Market Operator (AEMO) may direct SA Power Networks to reduce solar exports as a last resort if the electricity network is at risk of instability. This is a measure to prevent unplanned outages when high solar exports meet low energy demand. You can learn more about this in our guide on solar curtailment and the annual Smarter Homes test in South Australia. For more detailed information on Flexible Exports, refer to our dedicated guide: Flexible Exports in South Australia.

What you can check yourself, and what you cannot

As a homeowner, your primary role in connecting solar and understanding export limits involves gathering information and working with accredited professionals.

What you can check yourself:

1. Your System's Size: Understand the total inverter capacity (in kVA) of your proposed or existing solar system. This will determine which embedded generation size class it falls into.
2. Your Electricity Bill: Locate your electricity distributor's name on your bill to confirm you are indeed with SA Power Networks if you are in South Australia.
3. Flexible Exports Eligibility: If you are installing a new system or upgrading a small embedded generation system, discuss Flexible Exports with your installer to understand its benefits and requirements, such as the need for an internet-connected inverter.
4. Network Conditions: Be aware that factors like the volume of solar installations in your area and overall network capacity can affect your actual export capacity, even with Flexible Exports.

What you cannot do yourself:

1. Complete Connection Forms: Due to the technical nature of the information required, an accredited installer or electrical consultant must complete the connection forms on your behalf through SA Power Networks' "The Portal."
2. Change Inverter Settings for Grid Protection: Grid protection settings, including export limits, are configured by your accredited installer according to SA Power Networks' requirements and AS/NZS 4777.2. Changing these settings yourself can breach your connection agreement and compromise network safety.
3. Witness Commissioning: For Medium and Large Embedded Generation systems, SA Power Networks requires a formal witnessing of the system's commissioning, which is a process conducted by qualified personnel.

Always rely on your accredited solar installer or an electrical consultant for specific technical details, application submissions, and system commissioning.

What the published sources do not tell you

While SA Power Networks provides comprehensive information on their connection processes and export management, there are specific details that are not publicly available or are subject to change:

• Specific Fees: The exact application fees for Medium and Large Embedded Generation are not detailed in the public information, only mentioned as an invoice that will be sent.
• Detailed Technical Specifications: While the connection process outlines requirements for compliance, the granular technical specifications (e.g., specific standards beyond AS/NZS 4777.2, detailed sample documentation) are not directly provided in the public material. AS/NZS 4777.2 itself is a paid standard, and its specific inverter trip thresholds are not published by SA Power Networks. Your installer or distributor can confirm what is configured on your inverter.
• Direct Legislative Links: The specific "SA Government dynamic exports requirements" document or legislation that mandates Flexible Exports compatibility for systems installed from 1 July 2023 is referenced but not directly linked or quoted.
• Future Export Capacity Figures: While it is stated that "Future export capacity will fall as more PV customers export into the SA Power Networks' network and more customers select Flexible Exports," specific projections or figures for this anticipated reduction are not provided.
• Exact Network Capacity Factors: The precise factors and thresholds that determine available export capacity at a specific site, beyond general mentions of "volume of solar installations within a particular area" and "other network capacity factors," are not publicly detailed.
• Templates and Guides: Several templates and guides for large embedded generation (e.g., commissioning plan, compliance and monitoring program, DAPR guide) are mentioned as available on the SAPN website but are not stated on the public pages we could read.