The cheapest way to charge your EV at home is rarely a new battery.
In 2026 the two cheapest ways to charge an electric car at home are a cheap overnight off-peak window or your own surplus daytime solar. A home battery bought mainly to charge the car almost never pays for itself. Here's the honest decision order — cheapest option first.
Reviewed by the Mission Green Energy Team · Updated July 2026
What's the cheapest way
to charge an EV at home?
Cheap overnight off-peak power, or your own surplus daytime solar — whichever your car can actually use. A new home battery bought mainly to charge the car almost never earns its keep.
Here's the honest short version, because the sales pitch tends to over-complicate it. The cheapest electrons for your car are either the ones you buy in a cheap overnight window on a dedicated EV plan, or the surplus solar your roof makes during the day that you'd otherwise export for a small feed-in tariff. Dedicated EV plans commonly advertise overnight super-off-peak rates well under 10c/kWh — some sit around 7-8c/kWh between midnight and 6am — while a standard flat rate is often around 27-31c/kWh. That gap is the whole game. (Rates change and vary by network and retailer, so treat every figure here as an indicative range and check current pricing at the source before you switch.)
What almost never wins the cheapest-charging contest is buying a new home battery to feed the car. You lose energy to round-trip conversion moving it solar-to-battery-to-car, and a battery busy charging the EV isn't doing the household bill-shifting that justifies most battery purchases in the first place. A battery can still be a good buy on its own merits — but let the EV be a bonus reason, never the headline one. If you're weighing a battery at all, start with our honest guide to whether a home battery is worth it.
Work through it
cheapest option first.
Instead of a single "best" answer that ignores your situation, here's the order we'd actually work through with a friend. Stop at the first one that fits your driving pattern — you probably don't need the ones below it.
- Use your car's own timer on a cheap overnight window. If you're on (or can switch to) a plan with a cheap super-off-peak overnight rate, set the car to charge then. Zero extra hardware, and it's the cheapest routine option for most homes without spare daytime solar.
- Soak your own surplus solar during the day — if the car is home and parked in daylight. Energy you'd otherwise export for a low feed-in tariff has a very low effective cost, so daytime solar charging can beat even a good overnight rate.
- Look at a dedicated EV electricity plan. If your current plan doesn't have a genuinely cheap window, an EV-specific tariff often does — but check the rest of the plan's rates, because a cheap overnight number attached to expensive peak rates can wipe out the saving.
- Check whether the Solar Sharer free midday window applies to you (NSW, SA and south-east Queensland). If your car is home mid-day, a scheduled charge into that free window can cost nothing during the window.
- Only then consider a battery — and only if it stacks up for your household energy and backup, with EV charging as a bonus. Never buy a battery whose business case depends on charging the car.
Most people find their answer in the first two steps. The rest are refinements, not requirements — and if a quote jumps straight to step five, that's worth a raised eyebrow.
Cheap overnight
off-peak and super-off-peak.
The default cheapest option for anyone without spare daytime solar: charge while you sleep on a plan with a genuinely cheap overnight window. No solar, no battery, no new gear required.
Time-of-use and dedicated EV plans split the day into windows with very different prices. Overnight — typically around midnight to 6am — is when the grid is quietest and rates are lowest. Dedicated EV plans commonly advertise super-off-peak overnight rates well under 10c/kWh; some retailers publish figures around 7-8c/kWh for that window, against standard flat rates often in the 27-31c/kWh range. For a car that mostly sits in the driveway overnight, that's the cheapest routine charging there is, and it needs nothing but a schedule set on the car.
Two honest cautions before you switch a plan for this:
- Judge the whole plan, not just the headline overnight number. A cheap super-off-peak rate paired with expensive peak and shoulder rates can leave your total bill higher if the rest of your household use lands in the pricey windows. Our guide to time-of-use vs flat vs demand tariffs walks through how to read them.
- Make sure you can actually charge in the window. If the car isn't home overnight, or your charging speed can't refill it inside the cheap hours, the advertised rate is theoretical. Match the window to your real routine.
Compare plans independently at the Australian Government's Energy Made Easy site rather than trusting a single retailer's marketing, and remember rates and windows change — confirm the current terms before you commit.
Charging off
your own daytime solar.
If you have rooftop solar and the car is home in daylight, the cheapest electrons of all are the surplus ones your roof is already making — the energy you'd otherwise export for a small feed-in tariff.
Here's the logic. Every kilowatt-hour of solar you export earns a feed-in tariff, which across much of the country in 2026 is modest — often only a few cents. If instead you divert that surplus into the car, the effective cost of charging is roughly what you gave up by not exporting it: a low single-digit cents-per-kWh figure in many cases. That's why self-consumption — using your own generation rather than selling it cheap and buying back dear — is the quiet winner of home EV charging when the timing lines up.
The catch is timing. Solar charging only works if the car is home and plugged in while the sun's up, which suits people who work from home, retirees, second cars, or anyone who can leave the EV on the charger during the day. For a typical EV drawing on the order of 15kWh per 100km of city driving, even a few sunny hours of surplus can cover an average day's commute — but a car that's out all day can't use a watt of it.
To make it automatic rather than a chore, a solar-matching smart charger helps: it can be set to charge only from surplus generation, so you're topping up the car without dragging expensive power from the grid. That's genuinely useful — but it's an optimisation, not a licence to overspend on hardware. More on where a smart charger earns its keep below, and in our guide on whether you need a dedicated EV charger at all.
The Solar Sharer
free midday power window.
From July 2026, eligible households in NSW, SA and south-east Queensland can get a daily free-electricity window — and no rooftop solar is required. If your car is home midday, that's a genuine cheapest-charging lever.
The Australian Government's Solar Sharer Offer requires larger electricity retailers — those with more than 1,000 customers — in Default Market Offer regions to make available a plan with a free electricity window in the middle of the day. The free window is around 11am-2pm in NSW and south-east Queensland and 12pm-3pm in South Australia, with up to 24kWh of free electricity during that window each day. Crucially, you don't need your own rooftop solar to use it — the point is to share cheap midday solar generation with everyone, renters included. (Source: the scheme sits under the Australian Energy Regulator's Default Market Offer framework — see the Sources below, and confirm the current terms there, as details can change.)
For EV charging this is a real opportunity — with real conditions. If your car is home midday, a smart charger scheduled into the free window can charge it for nothing during the window. But be honest with yourself about three things:
- You need to opt in and have a smart meter. It's a specific opt-in plan through your retailer, not an automatic discount.
- Judge the whole plan. A free midday window attached to expensive rates the rest of the day can net out worse — compare the full plan, the same way you would any EV tariff.
- Your car has to be there. If the EV is at work every weekday midday, the free window can't charge it. It suits home-based drivers and second cars best.
We've written a fuller explainer on the mechanics, eligibility and honest catches in our guide to the Solar Sharer free power window.
Do you need a smart charger —
or a battery — to charge cheaply?
Short answers: a smart charger helps but isn't essential, and a battery bought to charge the car almost never pays. Here's how the three pieces of kit actually stack up.
The car's own timer
Almost every EV lets you set a departure time or charging schedule from the car or its app. That alone pushes charging into a cheap overnight window — no extra hardware needed. It's the cheapest cheap-charging tool you own.
A smart wall charger
Adds tariff-aware scheduling and, if you have solar, solar-matching that charges only from surplus. A genuine convenience and optimiser — but a tool, not the thing that unlocks the savings. Don't overspend chasing a few cents.
A battery just for the EV
Round-trip losses moving energy solar-to-battery-to-car eat the benefit, and a battery charging the car can't also shift your household bill. As an EV-only purchase, it almost never pays back.
How does home charging
compare to public fast charging?
Home charging on a cheap window is almost always the cheapest routine option. Public fast charging is a convenience for road trips — priced accordingly.
To put the home options in context: public DC fast charging in Australia commonly runs in the region of roughly 45-80c/kWh depending on the network and charging speed. A standard home flat rate is often around 27-31c/kWh, and a good overnight super-off-peak EV plan can sit under 10c/kWh. So home off-peak charging can be several times cheaper per kilowatt-hour than a rapid public charger. (These are indicative ranges that vary widely by network and change over time — check current pricing before relying on any figure.)
None of that makes public charging bad — it's the right tool for road trips and top-ups away from home, and you're paying for the speed and the location. The honest takeaway is simply that for routine, everyday charging, the cheapest option is almost always at home in a cheap window, not out at a rapid charger. Build your routine around home charging and treat public fast charging as the occasional convenience it's priced to be.
So what should most people
actually do?
Start with what you already have. For most homes, the cheapest EV charging costs nothing extra to set up — it's a schedule, not a purchase.
If you have no solar, the cheapest move is usually a plan with a genuinely cheap overnight super-off-peak window, with the car set to charge in it — no new hardware required. If you have solar and the car's home in daylight, soak your own surplus during the day, ideally with a solar-matching charger, and lean on cheap overnight power the rest of the time. If you're in NSW, SA or south-east Queensland and the car's home midday, check whether a Solar Sharer plan's free window suits your routine. And don't buy a home battery to charge the car — if a battery makes sense at all, it's for your household energy and backup, with EV charging a bonus on top, never the justification. Either way, the cheapest first steps cost nothing but a bit of setup, so exhaust those before you spend a dollar on gear.
Cheapest EV charging?
Your questions, answered.
For most people it is one of two things: a cheap overnight super-off-peak window on a dedicated EV electricity plan, or your own surplus rooftop solar during the day. Dedicated EV plans commonly advertise overnight rates well under 10c/kWh — for example around 7-8c/kWh between midnight and 6am on some retailers' plans — while standard flat rates sit far higher. Charging on surplus solar you would otherwise export for a low feed-in tariff can be cheaper still in effective terms. Which one wins depends on whether you have solar, when your car is parked, and your plan's rates, so compare the actual numbers on your own bill before switching. Figures change — check current rates at the retailer and on the Australian Government Energy Made Easy comparison site.
It depends on your circumstances, and often the honest answer is "whichever your car can actually use". Surplus daytime solar can have a very low effective cost because it displaces energy you would otherwise export for a small feed-in tariff, but it only works if the car is home and parked during sunlight hours. Cheap overnight super-off-peak power — commonly under 10c/kWh on dedicated EV plans — works while you sleep and needs no solar at all. Many households do best with a mix: solar-soak on days the car is home, super-off-peak overnight otherwise. Run both against your own driving pattern rather than assuming one always wins.
Usually no. A home battery bought mainly to charge a car rarely pays back, because you lose energy to round-trip conversion losses moving it solar-to-battery-to-car, and a battery that charges an EV can't also be doing the household bill-shifting that justifies most battery purchases. In almost every case, cheap overnight off-peak power or charging directly off surplus daytime solar beats putting a new battery in the middle. A home battery can still make sense on its own merits for household energy and backup — but let the EV be a bonus reason, never the main one. If you are weighing a battery, start with our honest guide to whether a home battery is worth it and run your own numbers.
Possibly, if you are in the right area and can shift charging to the middle of the day. The Australian Government's Solar Sharer Offer, available from July 2026 in New South Wales, South Australia and south-east Queensland, requires larger retailers in Default Market Offer regions to offer a plan with a free electricity window — around 11am-2pm in NSW and south-east Queensland and 12pm-3pm in South Australia — with up to 24kWh free during that window each day, no rooftop solar required. If your car is home midday, a smart charger scheduled into that window could charge it for nothing during the free period. It is an opt-in plan through your retailer and you need a smart meter, and the rest of that plan's rates matter too, so compare the whole plan. Check current terms at the Australian Energy Regulator before switching.
Not strictly, but it makes cheap charging automatic. Almost every EV lets you set a departure time or a charging schedule from the car or its app, so you can already push charging into an overnight off-peak window for free. A smart wall charger adds scheduling that follows your tariff windows and, if you have solar, solar-matching that charges only from surplus generation so you are not pulling from the grid. The charger is a convenience and optimisation tool, not a requirement — if a quote pushes an expensive smart charger as the thing that unlocks savings, remember the car's own timer already does most of the job. See our guide on whether you need a dedicated EV charger at all.
Substantially, in most cases. Public DC fast charging in Australia commonly runs in the region of roughly 45-80c/kWh depending on the network and speed, while a standard home flat rate is often around 27-31c/kWh and a good overnight super-off-peak EV plan can be under 10c/kWh. That makes home off-peak charging several times cheaper per kilowatt-hour than rapid public charging. Public fast charging still has its place for road trips and top-ups away from home; the point is simply that home charging on a cheap window is almost always the cheapest routine option. Rates vary widely by network and change over time, so treat these as indicative ranges and check current pricing.
Where these figures come from.
Rate ranges, dates and scheme details on this page are drawn from official and industry primary sources and were current as at 2026. Electricity prices change often and vary by network and retailer — confirm at the source before relying on a figure.
- energy.gov.au — Solar Sharer Offer (Australian Government: start date, states, free-window times, 24kWh daily cap, smart-meter and opt-in requirements)
- Australian Energy Regulator — Default Market Offer 2026–27 final determination (the framework the Solar Sharer Offer sits under)
- Energy Made Easy — Australian Government independent electricity plan comparison (AER)
- Green Vehicle Guide — Australian Government EV energy-consumption data (kWh per km)
- energy.gov.au — electric vehicles and home charging guidance
- AGL — example dedicated EV plan with an overnight super-off-peak window (retailer, illustrative rate)