Solar Export Limits: How They Affect Your System
Panel capacity, inverter output and approved export limits are different. How to check your property’s connection settings.
Solar
An export limit is the maximum rate of electricity a property is permitted to send to the grid under its connection arrangements. It is different from panel capacity and inverter output.
What solar export limits actually are
An export limit is a maximum rate — usually in kW — you are allowed to send to the grid at your connection point. Your retailer does not invent it. Your local network (DNSP) sets connection conditions when the system is approved. Common forms include:
- Static export limit — a fixed cap (for example, a set kW) at all times
- Zero export — generation for the house only; nothing goes out
- Dynamic / flexible export — allowed export can change with local conditions, where available
Export limits vs inverter size vs panel size
Read these ratings separately:
- Panel capacity (kW DC) — how much the roof can produce in good sun
- Inverter capacity (kW AC) — how much the inverter can convert
- Export limit (kW) — how much you are allowed to send to the grid
Emergency backstop and remote curtailment
Normal export control and emergency backstop arrangements have different purposes. Ask the installer which functions apply to your connection and how they operate. Useful checks include:
- Ask how normal export control operates at your connection point
- Confirm whether and how an emergency backstop applies
- Use monitoring and installer advice to distinguish expected control from a fault
How to design around export limits
Designing around the limit takes a few deliberate choices:
- Assess solar size using daytime consumption, later demand and export value.
- Consider supported schedules for hot water, pool pumps or EV charging to use available generation.
- Assess a battery using charging energy, expected later use, losses, cost and any backup requirements.
- Ask whether a flexible export arrangement is available and suitable at the connection.
- Confirm the network application and approved settings before finalising the installation.
What to check on your system this week
Start with these two records:
- Note your approved export limit — connection paperwork or installer handover.
- List daytime loads you could shift or automate.
Check the connection offer
Networks can offer fixed or flexible export arrangements, with conditions that vary by location and installation. Ausgrid’s solar guidance is one example; it should not be applied as a universal national rule.
Obtain the approved offer and ask the installer to confirm the commissioned settings. Normal export control and emergency backstop arrangements are also different functions.
What to do if output looks wrong
Record the time, weather, appliance use and any alerts. Compare the pattern with the approved limits, then ask the installer to investigate. Do not change protected network settings yourself.
Contact Lightning Energy to discuss the options for your property and electricity use.
