How Do Solar Panels, Battery Storage and EV Chargers Work Together?

If you're considering solar panels, you've probably also looked at battery storage or an EV charger. While each offers its own benefits, they're designed to work best as part of the same home energy system.

From our experience, one of the biggest misconceptions is that these technologies operate independently. In reality, your solar panels sit at the centre of the system, with your battery and EV charger simply helping you make better use of the electricity they generate.

Understanding how that electricity moves around your home makes it much easier to see where battery storage and EV charging fit in.

How does electricity flow through a solar energy system?

Every time your solar panels generate electricity, your home's energy system decides where it's needed first.

The priority is usually straightforward. Electricity generated by your solar panels is used to power the appliances and devices you're already using. If your system is producing more electricity than your home needs, that surplus can then be stored in a battery, used to charge an electric vehicle or exported to the grid.

The exact order can vary depending on your equipment and system settings, but the aim is generally the same: use as much of your own solar electricity as possible before importing power from the grid.

What happens to surplus solar electricity?

Surplus solar electricity is simply the energy your panels generate that your home doesn't need immediately.

Rather than letting that electricity leave your property straight away, it can be put to better use. Battery storage allows you to save surplus energy for later in the day, while an EV charger can use it to charge your car if it's plugged in.

From our experience, homeowners often see the greatest benefit when they're able to use more of this surplus generation themselves instead of exporting it. That's one of the reasons battery storage and EV chargers have become such popular additions to home solar systems.

Can solar panels charge a battery and an EV at the same time?

Yes, provided your solar panels are generating enough electricity.

Your home continues to use solar power first, with any remaining generation shared between the battery and EV charger. If there's more demand than your panels can supply, the system automatically draws additional electricity from the battery, the grid or both, depending on how it's been configured.

The process is automatic, so there's no need to manually switch between different energy sources or decide where your solar electricity should go.

Can solar power charge your EV?

Yes, but only if your solar panels are generating enough electricity.

How much of your EV's charge comes from solar depends on several factors, including the weather, the size of your solar system, your household's electricity demand and when you plug your car in.

From our experience, many homeowners assume every daytime charge is powered entirely by solar. In reality, your EV often uses a combination of solar and grid electricity, particularly if your home is using energy at the same time or your car is charging quickly.

Charging your EV during periods of strong solar generation can help you make better use of the electricity your panels produce.

What happens when your solar panels aren't generating enough electricity?

Solar panels don't generate the same amount of electricity all day. Output changes with the weather, the season and the time of day.

When generation falls, your home continues to use any solar electricity that's available. If more power is needed, your battery can supply stored energy before additional electricity is imported from the grid, depending on how your system has been configured.

This all happens automatically, so your home's electricity supply isn't interrupted as solar generation changes.

Do you need to install everything at the same time?

No. Many homeowners build their home energy system over time.

For example, you might install solar panels first, add battery storage later and fit an EV charger when you buy an electric vehicle. As long as the equipment is compatible, these technologies can usually work together within the same system.

This approach allows homeowners to spread the investment while increasing the amount of solar electricity they can generate, store and use as their needs change.

Why these technologies work best together

Solar panels generate clean electricity during the day, while battery storage and EV chargers help you make better use of that energy instead of relying on the grid.

Whether you're looking to reduce your electricity bills, increase your energy independence or prepare your home for an electric vehicle, combining these technologies can help you get more value from your solar generation.

At iHeat, our trusted solar installers can design a home energy system that suits your property and energy usage, helping you generate, store and use more of your own electricity both now and in the future.