How SA's 3-Hour Free Electricity Window Makes a Home Battery Pay for Itself

South Australia now offers 3 hours free electricity every single day. It’s called the Solar Sharer scheme, and most homeowners barely know it exists yet. On its own, a free power window from 12pm to 3pm is a nice little perk. Paired with a home battery, it becomes something far more valuable.

If you’re only using that free window to run the dishwasher or charge the car, you’re leaving most of the value behind. The households getting real value are storing that midday power and drawing it down later, when electricity costs the most. A properly sized home battery is what turns three free hours into savings that stretch across the whole evening.

This guide explains how the scheme works, what battery setup makes the most of it, and where current rebates fit in. Plenty of Adelaide homes are already running a hybrid solar battery setup, which makes fitting the free window into your daily routine even simpler.

What Is South Australia's 3 Hours Free Electricity Scheme?

Solar Sharer is a federal scheme, not something run by SA Power Networks or Sharpe. It started on 1 July 2026. It applies to households in South Australia, New South Wales and South East Queensland. Every retailer with more than 1,000 customers in these areas has to offer at least one eligible plan.

In South Australia, the free window runs from 12pm to 3pm ACST. Eligible households can use up to 24kWh of completely free electricity in that time. That’s roughly what an average Adelaide home uses in a full day.

You don’t need rooftop solar to qualify. You do need a smart meter, though. And you need to actively opt in through your energy retailer, because the scheme isn’t switched on automatically.

The window and the 24kWh cap are set by the scheme rules. But exact plans and any extra conditions can vary between retailers. It’s worth checking the fine print with your own provider before you switch, since offers are still settling in as the scheme beds down.

Why a Home Battery Turns Free Power Into All-Night Savings

Here’s the catch most people miss. Free power between midday and 3pm is only useful in the moment if you’re actually home to use it. Plenty of Adelaide households are at work during those hours. That means the free electricity often goes to waste unless something is storing it.

A home battery system solves that problem. Instead of hoping you’re home to run the oven or the washing machine between 12 and 3, the battery quietly fills up during the free window. That stored energy is ready to go the moment the sun sets and household demand climbs.

This matters because evening peak is exactly when electricity costs the most. You’re banking free daytime power and spending it during the priciest hours of the day. That’s where the real financial upside sits. Without a battery, Solar Sharer is a nice discount. With one, it starts covering a genuine chunk of your daily energy use.

If you’ve been accepting regular high energy bills as just the cost of running a household, this is one of the simplest changes you can make without altering how you live day to day.

Inverter Size Matters: Why 10kW+ Charges Faster Within the Window

Not every battery setup can pull the full 24kWh in three hours. This comes down to your inverter. A smaller single phase inverter, around 5kW, is limited in how fast it can push power into the battery. Some households simply can’t use the whole free allowance before the window closes.

A larger inverter, particularly a 10kW or three phase unit, can charge a battery noticeably faster. That extra headroom is the difference between topping up half your battery and filling it completely before 3pm.

If you’re on a three phase supply, or planning a battery install anyway, get a licensed technician to check your inverter and switchboard setup. Older switchboards sometimes need a switchboard upgrade before they can safely handle the extra load a bigger inverter and battery bring. There’s little point having 24kWh of free power on offer if your hardware can only absorb half of it.

Battery Sizing Guide: 10kWh vs 13.5kWh vs 20kWh for SA Households

Battery size should match how your household actually uses power. It shouldn’t just match the size of the free window. Here’s a rough guide for Adelaide homes.

• 10kWh batteries suit smaller households or units. They generally cover evening use for one or two people, with little left over for the next morning.
• 13.5kWh batteries are the most common choice for a typical three or four bedroom family home. They usually cover dinner, heating or cooling, and evening screen time.
• 20kWh batteries fit larger households, homes with a pool or spa, or families running an EV charger overnight on top of normal evening use.

Bigger isn’t automatically better. A battery that’s too large for your usage takes longer to fill from a single 24kWh window. It also takes longer to pay off, and battery size does matter far more than most homeowners expect. Our deep dive on the best solar batteries for Adelaide homes breaks down specific models and pricing if you want to compare options properly.

Stacking It With Battery Rebates and the CHBP

The old SA Home Battery Scheme offered up to $6,000 in direct state rebates. It closed to new applications back in 2022 and hasn’t returned. If you’ve seen an older article promising that subsidy, it’s out of date.

What’s still available is the federal Cheaper Home Batteries Program. It currently knocks a meaningful percentage off the upfront cost of an eligible battery installed alongside solar. We’ve also covered the latest CHBP rebate details for 2026 if you want the full breakdown. There’s also a South Australian VPP incentive through the state’s Retailer Energy Productivity Scheme. At the time of writing, this has been tightened to priority groups such as pensioners, health care card holders and lower income renters. General funding runs in and out depending on the year’s budget.

Because these figures shift often, it’s worth getting current numbers before you commit to a system. Our team can talk you through what applies to your household right now, including the CHBP rebate and current battery pricing. Sharpe also offers finance options if you’d rather spread the cost over time.

Ready to see what a battery could save on your bill? Book a free assessment online and one of our licensed technicians will walk you through sizing, rebates and installation timing.

Real Example: A 3-Hour Charge vs Peak Evening Rates

Numbers help make this concrete, even as rough figures. Say a household charges a 13.5kWh battery mostly full during the free window. That’s roughly 13.5kWh of electricity that cost nothing to buy.

If that same household draws the stored power down during evening peak, the savings add up. Many SA retail plans sit somewhere around 45 to 55 cents per kilowatt hour during peak times. Avoiding that cost for one evening is worth somewhere in the order of $6 to $7.50. Multiply that across a full year of daily charging, and the savings start adding up to several hundred dollars. That’s on top of whatever your battery was already saving from solar self-consumption.

Your actual figures will depend on your retail plan, your usage pattern, and how consistently you can charge during the window. Households already seeing strong results from battery storage tend to treat the free window as a daily habit, not an occasional bonus.

Bank Your Midday Power

The Solar Sharer window is a genuine opportunity for Adelaide households. But it only pays off properly when there’s a battery in place to catch it. Get the sizing and the inverter right, understand what rebates currently apply to your situation, and that free three hours starts working for you every single day of the year.

Sharpe Trade Services has been installing and servicing solar and battery systems across Adelaide for 45 years, with in-house licensed technicians, a 10 year workmanship warranty and full insurance backing every job. If you’d like a straight answer on what battery setup suits your home, and what rebates you currently qualify for, give our team a call on 8262 5000.