Can I charge my electric car using my solar panels?
Yes. Rooftop solar can contribute to EV charging while it is generating. The key question is whether you want to charge during sunny hours or have a compatible charger automatically follow the surplus power left after your home has used what it needs.
Daytime charging and surplus-solar charging are different
An EV charger connected to your household supply can use electricity supplied by your solar system while the system is generating. A basic daytime schedule does not, by itself, prevent the charger from drawing grid power when a cloud passes or household demand rises.
A compatible surplus-solar control system monitors energy flow and adjusts charging to suit what is available. The Australian Government recommends considering charging times and smart energy management in its home charging guidance.
Look at spare solar, not just the number on the panels
Here is a simple example: the solar system is producing 5 kW, while the rest of the home is using 2 kW. Ignoring other equipment and losses, that leaves 3 kW for the car. If charging draws 7 kW, the remaining 4 kW has to come from another source, such as the grid or a home battery, depending on your setup.
Turn on a large household load and the available surplus changes. That is why the panel system's advertised capacity does not tell you how much solar will be available for charging at a particular moment.
What do solar-only and solar-assisted modes mean?
Modes and operating thresholds depend on the product. For example, Ocular describes three modes for its IQ Home Solar:
- Fast: charging up to the configured limit, using solar, grid electricity or both.
- Solar Assist: a combination that can use grid electricity to maintain charging when solar is low.
- Solar Only: charging when sufficient surplus is available, with pauses when it falls below the required threshold.
The single-phase and three-phase versions have different solar-only requirements. Check the exact model and current documentation rather than assume every solar charger behaves the same way. See the manufacturer's product information and IQ Home Solar FAQs.
Do I need a home battery?
No battery is needed simply to use solar as it is generated during the day. Storage can make some of that energy available later, but a car charge may use a substantial part of the stored energy. If you already have a battery, its settings and the charger's controls need to be considered together.
Your routine matters: if the car is away throughout the solar-producing part of the day, a solar-only charging plan may not meet your needs. Compare available daytime charging, overnight tariffs and the energy you would otherwise export. Solar charging is not automatically a zero-cost option; using energy yourself can mean forgoing export credits. The government's solar and battery explanation covers how these energy flows affect bills.
What should I send for a solar-charging quote?
Send your car model, solar inverter model, any battery details, typical times the car is at home and a photo of the parking space. Include the outside of the closed switchboard if accessible. Electrical3 can then discuss the equipment and installation details for your Northern Beaches or North Shore property.
For charging-time examples, read how long home charging takes. For installation options, use the EV estimator below.