What Happens to My Solar System When the Switchboard Is Upgraded?

Your existing solar system can often stay in place when your switchboard is upgraded. Usually, it is safely isolated for the work, connected into the new arrangement, then tested before being returned to service. A switchboard upgrade does not automatically mean you need new solar panels or a new inverter.

The important part is understanding how your solar system connects to the home before the work begins.

For a Dunedin home with solar already installed, the switchboard upgrade should account for generation, monitoring, any battery storage and the circuits those systems support. That helps protect the investment you have already made while improving the electrical foundation around it.

1. Your solar system will need a planned shutdown

Expect an interruption to your household electricity and solar operation while the switchboard work is carried out. Confirm the expected downtime beforehand, particularly if you work from home or rely on electrically powered equipment.

A standard grid-connected solar inverter stops supplying power when the grid supply is lost. This is a safety function, so solar panels alone generally will not keep your home running during the upgrade. Aurora Energy explains this inverter protection.

However, switching off the house supply does not make every part of a solar installation safe to touch. Panels can still produce electricity in daylight, and batteries introduce another potential supply.

Your electrician needs to identify and safely isolate the relevant sources. Leave shutdown, reconnection and restarting during the work to the people carrying it out.

2. The panels may stay, but their connection needs checking

Replacing the switchboard does not normally require removing sound rooftop panels.

The existing inverter may also remain, provided its condition and suitability are confirmed. What needs attention is how the solar system connects to the new board.

That assessment should cover the solar supply cable, switching, protective devices, earthing, labels and the switchboard’s suitability for electricity supplied from both the grid and solar.

Existing faults, unsuitable equipment or changes to the system may require additional work. Those possibilities should be discussed before the installation day where reasonably practical.

The useful question is:

“What can remain, and what needs changing so the existing solar system works properly with the new switchboard?”

3. Monitoring and export controls need to be included

Some solar systems use a separate energy meter or small current sensors near the switchboard to measure electricity flowing into and out of the home.

Depending on the system, those measurements can support consumption monitoring, battery operation or controls that limit electricity exported to the network. These are functional parts of the installation, not simply an optional display. Fronius describes how its metering supports monitoring and energy management.

If that equipment is moved during the upgrade, its connections and configuration need checking afterwards.

A new switchboard also does not automatically increase your permitted solar export. If the project includes changes to inverter capacity or export settings, your installer should check the applicable network requirements.

4. Battery backup needs its own plan

If you have a battery, tell the electrician whether it provides backup power and which circuits it currently supports.

Having a battery does not automatically mean the whole house can run during an outage. Backup depends on the equipment and how the installation has been arranged.

Moving circuits between protective devices or boards needs to preserve the intended backup arrangement. For example, the fridge, selected lights and internet equipment may need to remain on designated backup circuits.

Do not assume the battery can keep supplying those circuits while switchboard work is underway. Safe isolation may require it to be shut down too.

If a battery is a future possibility, discussing it now can help with space and circuit planning. Spare switchboard space alone does not guarantee battery compatibility.

5. Reconnection should include a proper handover

The work should finish with more than household power being restored.

Ask your electrician to confirm that:

• The solar system has restarted correctly, with generation checked when daylight conditions allow.

• Monitoring shows sensible generation, consumption and grid-flow readings.

• Any export controls and battery functions affected by the work have been checked.

• Circuit identification, solar labels and relevant documentation have been updated.

• Required certification and any independent inspection have been completed.

Inspection requirements depend on the work involved. The EWRB identifies certain switchboard alterations and solar work as high-risk work requiring inspection, so this needs to be planned into the job. See the EWRB’s inspection guidance.

Start with the system you already have

Before accepting a switchboard proposal, make sure it clearly includes the existing solar system. Share installation records, inverter details, monitoring access and information about any battery or recurring faults.

A well-planned upgrade can improve circuit safety while retaining suitable solar equipment and avoiding unnecessary replacement.

At Riverline, our mission is safer circuits for Otago homes. That starts with understanding what is already connected, identifying what needs attention and planning the work in the right order.