Supporting EV charging and solar panels usually does not mean replacing your entire electrical system. The right approach is to understand your home’s existing capacity, protection and switchboard space, then improve only what is needed to support both systems safely.
The best result comes from planning the EV charger and solar system together, even if they will be installed at different times.
Why EV charging and solar need coordinated planning
An EV charger and a solar system affect your home differently.
The charger creates a sustained electrical demand, often for several hours. Solar panels generate electricity when sunlight is available, but that generation may not coincide with when the vehicle is charging. A car plugged in overnight, for example, cannot rely on daytime solar production unless energy has been stored in a battery.
This means solar should not simply be treated as cancelling out the charger’s demand. Your electrical foundation still needs to support the home when solar generation is low and several appliances are operating at once.
1. Decide what you want both systems to achieve
Before choosing equipment, clarify how you expect to use it.
For EV charging, consider:
How far the vehicle normally travels each day
How many hours it will be parked at home
Whether charging will happen during the day or overnight
Whether a second EV may be added later
Whether you genuinely need the charger’s maximum possible speed
For solar, consider whether the priority is reducing daytime electricity purchases, charging the vehicle from excess solar, preparing for a battery, or providing selected backup power in the future.
The largest charger or solar array is not automatically the best solution. The right equipment is the equipment that suits your household, your electrical system and your longer-term plans.
2. Review the existing electrical foundation
The next step is to assess the home before adding either system.
This should include the capacity of the incoming supply and mains, the condition of the switchboard, available switchboard space, circuit protection, earthing, existing loads and practical cable routes.
In many Dunedin homes, electrical additions have accumulated over several decades. The system may still operate reliably, but the switchboard might have limited room for an EV circuit, solar equipment or future battery connections.
A proper review helps establish whether the electrical foundation is Aligned or Constrained for what you are planning. It can also separate work that is necessary now from improvements that can reasonably wait.
3. Provide the right circuits and protection
A wall-mounted EV charger normally requires its own appropriately sized circuit and the correct protection for the selected charging equipment. EECA advises that wall-mounted charging units should be installed by a registered electrician using a separate sub-circuit. EECA provides further New Zealand home-charging guidance here.
If the switchboard has sufficient capacity, modern circuit protection and suitable cable access, the charger may be relatively straightforward to add. If it does not, targeted switchboard modernisation may need to happen first.
Solar also requires appropriate AC and DC protection, isolation, compliant equipment and certification. WorkSafe explains that residential photovoltaic work involving normal household electrical voltages must be completed and certified appropriately, with some parts also requiring independent inspection. WorkSafe outlines the requirements for photovoltaic systems here.
A mains or supply upgrade is not always necessary. It should only be recommended when the measured and calculated requirements show that the existing supply cannot support the intended plan.
4. Use smart control where it adds value
Smart EV charging can help the charger work within the home’s available capacity.
A charger with dynamic load management can reduce its charging rate when the house is using more electricity, then increase it when demand falls. Some systems can also prioritise surplus solar generation, allowing more of the vehicle’s charging to come directly from the home’s panels.
This coordination may reduce the need for an expensive supply upgrade, but it depends on the home, the equipment and the charging outcome required. It should be designed into the project rather than assumed afterwards.
5. Allow for connection requirements and future additions
Grid-connected solar involves more than installing panels and an inverter. Your installer will also need to coordinate network approval, suitable inverter settings, inspection, commissioning documentation and import-export metering.
For homes connected to Aurora Energy’s network, Aurora publishes a specific process for connecting small-scale solar generation. This involves the installer, an approved network inspector and the electricity retailer. Aurora Energy explains its small-scale solar connection process here.
Planning should also preserve physical switchboard space and cable pathways for future additions. That might include a home battery, a second charger, electric hot water, induction cooking or more heating.
When should you get advice?
It is worth assessing the electrical foundation before accepting equipment-specific quotes, especially when the home has an older switchboard, limited spare space or several other high-demand appliances.
A Power Integrity Review™ provides a structured view across Capacity, Protection, Distribution, Condition and Future Ready. From there, the work can be placed in the right order, whether that means proceeding immediately, completing a targeted improvement first or creating a staged pathway.
The takeaway
Upgrading for EV charging and solar is less about installing two new products and more about ensuring the home can support them as one coordinated system.
Start with clarity. Understand the existing supply, circuits, protection and switchboard capacity. Then select equipment, smart controls and future provisions that suit how the home will actually use power.
That approach creates safer circuits today and more room for whatever comes next.