EVs are growing in popularity in Australia right now, and with petrol prices increasing, it’s easy to see why. But there’s more to getting an EV right than picking your colour and signing the papers.
The charger you choose could be the best or worst decision you make.
We’ve helped homeowners across Sunbury and the Macedon Ranges set up their EV chargers the right way, and we’ve seen the same five mistakes come up time and again.
Here’s what to watch for and how you can avoid these common mistakes.
Mistake 1: They Underestimate How Much Power an EV Charger Actually Uses
An EV battery is not a small thing. Most modern electric cars carry between 60 and 80 kilowatt hours of storage depending on the brand. To put that in context, a Tesla Powerwall – a decent-sized home battery – holds 13.5 kilowatt hours.
Your car battery holds four to six times more energy than a typical home battery.
What This Means for Your Home
A standard Victorian home with single phase power and a 63 amp main switch has around 15 kilowatts of total capacity at any one time. A typical dedicated home charger runs at around 7 kilowatts. Meaning you could use as much as half of your home’s entire power capacity in one go.
If your home was already pushing its limits at peak times with the oven on, hot water running, heating going and so on, adding your EV charger is a problem waiting to happen.
Treating EV charging like filling a fuel tank just doesn’t work. You need to think about how it fits into everything else your home is doing.
Mistake 2: They Don't Know What to Ask For
Most people assume chargers are basically the same with different branding. They’re not. The features underneath the casing vary a lot and what you choose has a real flow-on effect for how your home energy system performs long term.
When we’re selecting which chargers to offer at Bluegum, there are two features that are non-negotiable.
Solar-aware
A solar-aware charger knows when your panels are generating more power than the home is using. Instead of sending that spare solar to the grid – often for little return – it redirects it straight to your car. If you’re home on a weekend with the car plugged in, you could be charging for free whenever the sun is out.
Even if you don’t have solar right now, choosing a solar-aware charger keeps that option open. Most chargers on the market do not have this feature, so it’s worth specifically asking.
Dynamic Charging
A dynamic charger monitors how much spare capacity your home has at any given moment and adjusts the charge rate accordingly. If the oven, hot water system and heating are all running at once, it automatically dials back so you don’t trip the power.
When load frees up, it ramps back up and takes the available capacity. Without this feature, plugging in during a busy evening will trip power to your whole home. That walk out to the meter box in the cold and dark gets old very quickly.
Mistake 3: Not Thinking About Your Home Energy Ecosystem
Your EV charger doesn’t live in isolation. It’s part of a bigger picture that includes your solar panels, inverter and home battery. It’s a system that ties it all together.
The ecosystem you start with shapes every decision you make after – and if your devices don’t communicate, control and savings slip through the gaps.
The Three Ecosystems We Work With
At Bluegum we work across three main ecosystems: Sigenergy, Fronius with BYD and Tesla. Within each one the solar, battery and EV charger communicate with one another. Mixing brands across ecosystems can cause real problems when devices that don’t talk to each other.
If you’re buying an EV charger first, that choice should inform what solar and battery you consider down the track. If you already have solar and battery, that should guide which charger you choose now. The order matters more than most people realise.
Mistake 4: They Underestimate How Much Solar They Need
It’s a reasonable assumption: you’ve got solar on the roof, so you’ll charge the car off that. But if your system is on the smaller side – five to ten panels, or under 4 kilowatts – you may not be generating enough to meaningfully charge an EV during the day.
To drive to Melbourne and back and replace that energy from solar, you might need 30 kilowatt hours or more in a single day.
Our Minimum Recommendation
We generally recommend a minimum of 10 kilowatts of solar for anyone planning to regularly charge from the roof. That’s a big step up from the 6.6 kilowatt systems that were the standard install just a few years ago.
This doesn’t mean you can’t get an EV with a smaller system – it just means you should plan ahead rather than assume the maths will work out in your favour.
Mistake 5: They Get Advice from the Wrong People
The default charger recommended by the manufacturer is there to make your purchase feel simple – not to optimise your home energy setup. A general electrician can wire a charger in, but may not have thought through ecosystem compatibility, load management or what you’ll want in two years.
Getting an EV right for your home requires someone who understands the full picture: your existing setup, your energy goals, which ecosystem you’re building toward and what that means for the long term. Taking an extra week to get proper advice can save you thousands and means you don’t have to undo decisions made in a rush.
The Bottom Line
An EV charger is a great move for most homes, but only when the setup behind it is right. Getting the charger, ecosystem and solar capacity sorted before you plug in means lower running costs and none of the frustration that comes from cutting corners.
The technology is exciting, but it works best when someone has thought it all the way through.
Frequently Asked Questions
Do I Need to Upgrade My Switchboard Before Getting an EV Charger?
Not always, but it depends on your existing setup. Homes with older switchboards or fuse-based boards often need an upgrade before a dedicated charger can be safely installed. A good installer will assess this as part of the quote process – it’s not something to skip.
Can I Just Use the Charging Cable That Came with the Car?
You can, but it’s slow and it’s not designed for regular daily use from a standard power point. The cable that comes with most EVs – often called a granny lead – is best kept as a backup. A dedicated home charger is significantly faster and is built for the job.
How Long Does It Take to Charge an EV at Home?
With a dedicated 7 kilowatt home charger, most EVs go from near-empty to full overnight – typically 8 to 12 hours depending on battery size. For most households that’s more than enough, since you’re plugging in each evening and leaving it overnight.
What If I Already Have Solar - Will That Cover Charging?
It depends on the size of your system. Smaller setups under 4 kilowatts are unlikely to generate enough surplus to charge an EV during the day. We generally recommend at least 10 kilowatts of solar if you want to regularly charge from the roof. A solar-aware charger helps by automatically directing spare solar to the car whenever it’s available.
If you want to make sure your EV, charger and home energy system all work together from day one, the Bluegum team is happy to walk you through it.
Book a free consult or give our friendly team a call on (03) 5426 5522