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Electric vehicles: what to know if you’re considering an EV
Most EV drivers charge at home a few times a week. Fast chargers are used on longer trips. Zaptech/Unsplash
Hussein Dia, Swinburne University of Technology Soaring petrol prices are once again making many Australians think seriously about switching to an electric vehicle.
As politicians warn Australians not to resort to panic buying, finding constructive ways to reduce your petrol costs and cut carbon emissions has become increasingly appealing.
The strikes on Iran have seen prices of Brent crude – the global oil benchmark – trade around US$104 (A$150) per barrel, up from roughly US$68 (A$96) a few weeks earlier. There is no clear end in sight for the current crisis.
The good news is buying and owning an electric car is becoming much easier as more models arrive in Australia and charging networks expand. But there are still a few things worth considering before making the switch.
What should you look for when choosing an EV?
Choosing an electric vehicle is not very different from choosing any other car. Size, price and safety features still matter.
But there are a few additional things worth checking.
The first is driving range, which is how far the vehicle can travel on a full battery. Most new EVs sold in Australia offer between 300 and 500 kilometres of range, which is more than enough for typical daily driving.
It is also worth looking at charging capability. Some vehicles can accept faster charging speeds than others, meaning they can recharge more quickly when using high-power public chargers. This can make a difference on long trips.
Finally, check the battery warranty. Most manufacturers offer warranties of eight years or around 160,000km, providing reassurance about long-term battery performance.
For most buyers, the key is simply choosing a vehicle that suits their everyday driving needs.
Check how much you drive
An important question to ask when choosing an electric vehicle is: how far do you usually drive each day?
Most Australians drive far less than they think. Car passenger kilometres per person have reduced from a peak of 13,184 in 2004 to 10,238 in 2024–25.
That’s roughly 28km per day, meaning many drivers could go several days between charges with today’s EVs. Most new models now sold in Australia have a real-world driving range of 300–500km on a full battery.
In practice, many EV owners simply plug their car in at home overnight once or twice a week.
Most EV drivers charge at home a few times a week. Fast chargers are used on longer trips. Zaptech/UnsplashDo you need to install a charger at home?
Many people assume installing a home charger is essential, but that is not always the case.
Electric vehicles can be charged from a standard household power point. This is the slowest method, but it can still add 10–15km of range per hour of charging. At that rate, a 12-hour overnight charge could give you up to 180km.
Many owners choose to install a dedicated wall charger instead. These typically cost A$1,000–2,000 plus installation. These charge much faster, allowing most vehicles to fully recharge overnight.
Fast chargers are useful, but usually not for everyday charging. Public fast chargers are designed mainly for longer trips.
These high-power chargers can add 150–300km of driving range per hour, depending on the vehicle and type of charger.
They are very convenient for highway travel but usually cost more than charging at home. Public fast charging can range from around 50 to 70 cents per kilowatt-hour, which is still cheaper than petrol, but the savings are smaller than charging at home.
Many EV owners only use public chargers occasionally, not every day.
How much should you charge the battery?
Another common question is whether EV batteries should always be charged to 100%.
For everyday driving, many manufacturers recommend keeping the battery between 20% and 80% most of the time. This helps maximise long-term battery health.
A fully charged battery is generally under more stress. However, charging to 100% shortly before a long trip is fine. Modern EV battery management systems are designed to protect the battery automatically.
In practice, drivers quickly develop simple routines, often charging overnight a few times per week.
How much could you save on fuel?
One of the main reasons drivers consider switching to an EV is the potential saving on running costs.
Electric cars are typically cheaper to run because electricity costs less than petrol and electric motors are far more energy efficient than combustion engines.
Home charging is also the cheapest way to run an EV. Electricity for overnight charging typically costs 20–30c per kilowatt-hour, which can translate to around $3–5 per 100km of driving.
By comparison, fuel-efficient petrol cars typically consume 6–8 litres per 100km and cost $14–18 to drive that distance at current fuel prices.
That difference can add up quickly over a year. Online tools, such as our public EV payback calculator, allow drivers to compare different vehicles and test how savings change depending on electricity prices, fuel costs and driving distance.
What if you live in an apartment or unit?
Charging can be more complicated for people living in apartments or units, but options are expanding quickly.
Many new residential developments now include shared EV charging infrastructure in car parks. Some apartment owners are also installing chargers in their individual parking spaces where building rules allow it.
Workplace charging is another growing option. Many employers are beginning to install chargers for staff vehicles, allowing drivers to top up their battery during the day.
Public charging networks are expanding across Australian cities. While these chargers typically cost more than home electricity, they provide an important option for drivers without dedicated parking or charging access at home.
As EV adoption increases, improving charging access for apartment residents is becoming a major focus for building managers and policymakers.
Where next?
The decision to switch to an electric vehicle has never been more straightforward. Ranges are longer, models are more affordable, charging networks are expanding and running costs are lower than ever.
As petrol prices remind Australians of their exposure to global oil markets, the case for making the switch gets stronger.
For most drivers, the question is no longer whether an EV could work for them – it is simply a matter of when.![]()
Hussein Dia, Professor of Transport Technology and Sustainability, Swinburne University of Technology
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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A US startup plans to deliver ‘sunlight on demand’ after dark. Can it work – and would we want it to?
Can a new satellite constellation create sunlight on demand? SpaceX/Flickr, CC BY-ND
Michael J. I. Brown, Monash University and Matthew Kenworthy, Leiden UniversityA proposed constellation of satellites has astronomers very worried. Unlike satellites that reflect sunlight and produce light pollution as an unfortunate byproduct, the ones by US startup Reflect Orbital would produce light pollution by design.
The company promises to produce “sunlight on demand” with mirrors that beam sunlight down to Earth so solar farms can operate after sunset.
It plans to start with an 18-metre test satellite named Earendil-1 which the company has applied to launch in 2026. It would eventually be followed by about 4,000 satellites in orbit by 2030, according to the latest reports.
So how bad would the light pollution be? And perhaps more importantly, can Reflect Orbital’s satellites even work as advertised?
Bouncing sunlight
In the same way you can bounce sunlight off a watch face to produce a spot of light, Reflect Orbital’s satellites would use mirrors to beam light onto a patch of Earth.
But the scale involved is vastly different. Reflect Orbital’s satellites would orbit about 625km above the ground, and would eventually have mirrors 54 metres across.
When you bounce light off your watch onto a nearby wall, the spot of light can be very bright. But if you bounce it onto a distant wall, the spot becomes larger – and dimmer.
This is because the Sun is not a point of light, but spans half a degree in angle in the sky. This means that at large distances, a beam of sunlight reflected off a flat mirror spreads out with an angle of half a degree.
What does that mean in practice? Let’s take a satellite reflecting sunlight over a distance of roughly 800km – because a 625km-high satellite won’t always be directly overhead, but beaming the sunlight at an angle. The illuminated patch of ground would be at least 7km across.
Even a curved mirror or a lens can’t focus the sunlight into a tighter spot due to the distance and the half-degree angle of the Sun in the sky.
Would this reflected sunlight be bright or dim? Well, for a single 54 metre satellite it will be 15,000 times fainter than the midday Sun, but this is still far brighter than the full Moon.
The balloon test
Last year, Reflect Orbital’s founder Ben Nowack posted a short video which summarised a test with the “last thing to build before moving into space”. It was a reflector carried on a hot air balloon.
In the test, a flat, square mirror roughly 2.5 metres across directs a beam of light down to solar panels and sensors. In one instance the team measures 516 watts of light per square metre while the balloon is at a distance of 242 metres.
For comparison, the midday Sun produces roughly 1,000 watts per square metre. So 516 watts per square metre is about half of that, which is enough to be useful.
However, let’s scale the balloon test to space. As we noted earlier, if the satellites were 800km from the area of interest, the reflector would need to be 6.5km by 6.5km – 42 square kilometres. It’s not practical to build such a giant reflector, so the balloon test has some limitations.
So what is Reflect Orbital planning to do?
Reflect Orbital’s plan is “simple satellites in the right constellation shining on existing solar farms”. And their goal is only 200 watts per square metre – 20% of the midday Sun.
Can smaller satellites deliver? If a single 54 metre satellite is 15,000 times fainter than the midday Sun, you would need 3,000 of them to achieve 20% of the midday Sun. That’s a lot of satellites to illuminate one region.
Another issue: satellites at a 625km altitude move at 7.5 kilometres per second. So a satellite will be within 1,000km of a given location for no more than 3.5 minutes.
This means 3,000 satellites would give you a few minutes of illumination. To provide even an hour, you’d need thousands more.
Reflect Orbital isn’t lacking ambition. In one interview, Nowack suggested 250,000 satellites in 600km high orbits. That’s more than all the currently catalogued satellites and large pieces of space junk put together.
And yet, that vast constellation would deliver only 20% of the midday Sun to no more than 80 locations at once, based on our calculations above. In practice, even fewer locations would be illuminated due to cloudy weather.
Additionally, given their altitude, the satellites could only deliver illumination to most locations near dusk and dawn, when the mirrors in low Earth orbit would be bathed in sunlight. Aware of this, Reflect Orbital plan for their constellation to encircle Earth above the day-night line in sun-synchronous orbits to keep them continuously in sunlight.
Bright lights
So, are mirrored satellites a practical means to produce affordable solar power at night? Probably not. Could they produce devastating light pollution? Absolutely.
In the early evening it doesn’t take long to spot satellites and space junk – and they’re not deliberately designed to be bright. With Reflect Orbital’s plan, even if just the test satellite works as planned, it will sometimes appear far brighter than the full Moon.
A constellation of such mirrors would be devastating to astronomy and dangerous to astronomers. To anyone looking through a telescope the surface of each mirror could be almost as bright as the surface of the Sun, risking permanent eye damage.
The light pollution will hinder everyone’s ability to see the cosmos and light pollution is known to impact the daily rhythms of animals as well.
Although Reflect Orbital aims to illuminate specific locations, the satellites’ beams would also sweep across Earth when moving from one location to the next. The night sky could be lit up with flashes of light brighter than the Moon.
The company did not reply to The Conversation about these concerns within deadline. However, it told Bloomberg this week it plans to redirect sunlight in ways that are “brief, predictable and targeted”, avoiding observatories and sharing the locations of the satellites so scientists can plan their work.
The consequences would be dire
It remains to be seen whether Reflect Orbital’s project will get off the ground. The company may launch a test satellite, but it’s a long way from that to getting 250,000 enormous mirrors constantly circling Earth to keep some solar farms ticking over for a few extra hours a day.
Still, it’s a project to watch. The consequences of success for astronomers – and anyone else who likes the night sky dark – would be dire. ![]()
Michael J. I. Brown, Associate Professor in Astronomy, Monash University and Matthew Kenworthy, Associate Professor in Astronomy, Leiden University
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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