We all know that the future is looking bright for solar. One in three households in Australia now has rooftop solar.
However, while we all recognise that solar energy is the future of renewable energy, do we truly understand what it is and how it's converted into power for our homes?
Understanding solar makes it even more apparent why Australia, with its average of 8 hours of sunshine daily, is the perfect place to invest in a solar system.
We’ll break down the basics of solar energy and how solar + battery systems operate.
What is solar energy?
Solar electricity generation is the process of turning sunlight into usable electrical power, and it’s at the heart of how solar systems work.
Solar energy can be harnessed using solar panels to generate electricity, heat, or water. It is renewable because the sun doesn’t run out of heat or light.
It’s also an abundant energy source - the sun delivers more energy to the Earth in an hour than the world can use in a year.
Solar energy can be harnessed in two primary forms: solar thermal and solar photovoltaic (PV). While both utilise the sun's energy, each requires a different mechanism and is used for various purposes.
Solar Photovoltaic (PV) - Homes and businesses
Solar photovoltaic (solar PV) is a process in which sunlight is directly converted into electricity using a solar PV cell.
The most common type of solar PV cell is a solar panel, which is typically installed on the rooftops of homes.
Most residential solar systems today use a solar PV system—short for solar photovoltaic system—to generate electricity for household use.
Solar Thermal - Extensive power facilities
Solar thermal is most often used in extensive power facilities, where concentrating solar-thermal power (CSP) systems use a system of mirrors to reflect sunlight onto receivers, which collect the solar energy and convert it to thermal energy, to produce electricity or be stored for later use.
What makes up a solar power system?
The main components of a solar power system include solar panels, an inverter, and mounting equipment, with optional elements like batteries and monitoring tools.
Solar panels
Solar panels do the heavy lifting in your solar system, converting sunlight into electricity.
There are three main types of solar panels, typically made from silicon, and they can be mounted either on rooftops or in suitable ground-mounted locations.
Inverter
The solar inverter function is essential—it acts as the brain of your solar setup, converting energy and managing power flow.
An inverter converts DC electricity to usable AC, which can be used in homes and offices.
Mounting system
Your solar system will also contain racks and other equipment to ensure that your solar panels are securely attached to a roof or the ground beneath them.
Battery storage (optional)
A solar battery enables you to store excess electricity generated by the solar panels for later use, particularly at night or during periods of the year when there is less sunlight.
How do solar panels work?
This process is known as the photovoltaic effect, where sunlight activates the electrons in silicon cells, generating electricity.
This process has several steps, which we’ve broken down below.
How solar panels generate electricity:
1) Sunlight hits the solar panels
Every solar panel contains hundreds of individual silicon photovoltaic (PV) cells. When sunlight strikes the solar panel, the photons in the sunlight transfer their energy to the electrons in the silicon.
2) Photons knock electrons loose in silicon cells
The energy the electrons absorb from the photons lets them break free from the silicon atoms.
3) This creates an electric current (DC)
The silicon in the solar panel creates an electric field, which directs the electrons to move in a specific direction, creating an electrical charge, known as direct current (DC) electricity.
4) A solar inverter converts DC to AC (usable electricity)
Most homes and businesses use alternating current (AC) electricity. This means the DC electricity generated by the solar panels has to be converted through an inverter.
This DC to AC conversion allows solar energy for everyday appliances, from refrigerators to lights.
How do solar batteries function?
Obviously, in a place as sunny as Australia, sometimes our solar panels generate more electricity than we need to power all our appliances. This is where solar batteries come in.
If your solar system generates more energy than you need, its DC electricity will go directly towards charging your battery.
The battery then stores this energy, so it’s available for you to use later when there’s less sun to create the energy you need.
Different types of solar batteries
When you decide to add a solar battery to your system, you may find there are a number of different options to choose from. As more people utilise the power of solar and understand the benefits that adding a battery can bring, the variety of batteries available increases.
Lead-acid batteries
Lead-acid batteries were the original solar batteries, which means they’re tried and tested. Compared to other batteries, they take up a lot of space and have a shorter life span.
Lithium-ion batteries
Lithium-ion batteries are among the most popular on the market due to their versatility and cost-effectiveness. They can struggle with excessive heat, but storing your battery inside will offset this issue.
Hydrogen batteries
Hydrogen batteries are under development, but are not currently robust enough for use in residential homes.
Flow batteries
Flow batteries are another option, but their cost may make them unattractive to the average Australian home.
At around $12,000 pre-installation costs, they are a significant investment. While they are highly durable, their lifespan is shorter than that of a lithium-ion battery, so this remains the most popular option on the market.
|
Battery Type |
Cost |
Lifespan |
Best For |
Notes |
|
Lead-acid |
Low |
3–5 years |
Off-grid backup |
Bulky, short lifespan |
|
Lithium-ion |
Moderate |
10–15 years |
Most residential applications |
Compact, efficient |
|
Flow |
High (~$12k) |
5–10 years |
Commercial or large homes |
Expensive, durable |
|
Hydrogen |
Experimental |
TBD |
Not yet for residential use |
Still in development |
Benefits of solar energy
Solar energy has many benefits. Not only are you doing something to combat climate change and reduce your carbon footprint, but your solar system will also pay you back for paying it forward.
Lower electric bills
Installing a solar or solar + battery system significantly reduces your reliance on the grid, which means lower electricity bills month after month.
Increase in Property Value
With solar becoming more popular, having a solar system can boost your home's market appeal and increase its resale value.
Environmental Impact
By switching to solar, you reduce greenhouse gas emissions and support a cleaner, more sustainable future.
Energy Independence
A solar + battery setup gives you more control over energy usage and protects against rising power costs and blackouts.
Long-Term Savings
Once your system is paid off, your solar energy will be essentially free, delivering long-term financial returns.
The future of solar energy
As solar adoption increases across Australia, more households are considering solar battery storage to maximise self-consumption and reduce their reliance on the grid.
Battery technology is advancing rapidly, and while it remains a significant investment, ongoing rebates and new financing models are making it more accessible.
Not every home is suitable for solar energy, so assessing your property’s orientation, available space, and usage patterns is essential before making a decision.
Many providers offer free consultations to help you determine whether solar—or solar + battery—is the right fit for your home.
As technology improves and prices fall, solar energy will become increasingly important in Australia’s energy future.
If you’re considering solar or battery storage, it’s worth speaking with a local expert to assess your options, rebates, and long-term benefits.
