Why is my solar export limited?

Your network provider limits how much solar power your home can send to the grid, to keep local voltage stable. In South East Queensland that is Energex. Dynamic connections can raise the limit when the network has room, and it falls back to a default if communication is lost. Usually it is a rule, not a fault.

Why does a limit exist?

The local network was built to carry power to homes, not to take large amounts back from thousands of rooftop systems at once. On a sunny afternoon many systems export together, which can push voltage above safe levels. Export limits keep the network stable and protect equipment, including yours.

What are dynamic connections?

Energex has a program called dynamic connections that can allow higher export limits when the network can handle it. Energex explains how it works for homeowners on its website. The limit can vary with network conditions and is set per phase, so what applies to your home depends on your connection and your system.

We have not listed specific figures here, because they can change. Your installer, your retailer and the Energex page can confirm the numbers for your property.

What if my system loses communication?

With a dynamic connection, the system relies on a communication link to receive its limit. If that link drops, the system generally reverts to a lower default limit. That can look like a sudden drop in export, even though nothing is physically broken. Your installer can check how your system handles this.

How can I tell a limit from a fault?

A limit usually shows as output levelling off at a ceiling on a sunny day, with no error message and a monitoring app that still reports normal operation. A fault more often brings an error code, a warning light, or output that drops to zero.

You can look at your installer's app or portal to see what your system is reporting. If something looks wrong, a licensed installer can diagnose it. Replacing equipment without a diagnosis is not a good idea, because it usually will not change a network limit.

Should I do anything about a limit?

Often the answer is nothing. Some households use more of their solar power at home, and some choose a battery to store the surplus, but those decisions depend on your circumstances and your retailer. Your installer can explain the options for your property without anyone having to replace working equipment. If you are unsure whether your system is on a dynamic connection, your connection approval and your installer are the places to look. They can also tell you whether the system relies on an internet or network link to receive its limit, which is useful to know if your internet drops out.