Since the federal battery rebate launched in July 2025, installations have gone from around 200 per day to over 1,500. Most of those households had the same conversation with their installer: which brand, what capacity, how much.
Nobody asks about the software.
A home battery is a box that stores electricity. What determines how well it performs financially is the software deciding when to charge it, when to discharge it, how much to hold in reserve, and when to export to the grid. Two households with identical batteries on identical solar systems can end up with very different electricity bills purely because of how their battery software is configured.
Most homeowners have no idea this gap exists, let alone which side of it they are on.
The self-consumption shift
Before getting into software, it helps to understand how the financial logic of home batteries has changed.
When feed-in tariffs (FiTs) were generous, some early schemes paid 44 or 50 cents per kWh, and exporting solar to the grid made good financial sense. Battery software designed around maximising export was well-suited to that environment.
That environment no longer exists for most Australian households.
FiTs in southeast Queensland (QLD) are expected to fall to just 3 to 6 cents per kWh in 2026, with rates in New South Wales (NSW) and other states similarly weak. Meanwhile, importing electricity from the grid costs 30 to 40 cents per kWh, depending one you state and plan.
Every kilowatt-hour you store and use yourself saves you the full import rate. Every kilowatt-hour you export earns you a fraction of that.
The primary measure of whether a battery is earning its keep in 2026 is self-consumption: how much of your own solar energy you use before it touches the grid. A battery configuration that prioritises self-consumption is now almost always worth more than one optimising for export timing. This matters because a lot of battery software was written before this shift became as pronounced as it is today.
Four structures, but a more complex reality
Australian energy regulators recognise four car residential tariff structures:
- Flat rate: One price per kilowatt-hour, regardless of when you use it
- Time-of-Use (TOU): The day is split into peak, shoulder, and off-peak periods with different prices for each
- Controlled load: A cheaper circuit for high-draw appliances like hot water systems that the grid can switch on and off
- Demand-based: A chart applied on top of normal usage based on your highest consumption spike in a billing period
Most battery software was built around flat rate and TOU. For those on those plans, even basic battery software does a reasonable job.
The problem is that a solar battery household now rarely has just a flat rate or basic TOU structure.
Sitting on top of those core structures are a growing set of solar and battery-specific billing components:
- A solar sponge window that offers near-zero electricity during midday hours when the grid is flooded with solar generation
- A time-varying FiT that pays different rates for exports depending on when they happen
- A Virtual Power Plant (VPP) arrangement that adds grid dispatch events, generating credits or bill allowances
Some have all 3 sitting on top of a TOU structure simultaneously.
The software running most home batteries was designed for a simpler world. When the real billing environment is this layered, the gap between what the software is doing and what it should be doing can cost a household hundreds of dollars a year.
The billing components that most battery software handles poorly
The solar sponge window is perhaps the most straightforward missed opportunity. A battery on an overnight off-peak charge schedule tops up from the grid between 10pm and 7am at a modest discount. A battery that recognises a solar sponge window charges from near-free grid electricity between 10am and 3pm instead. Many set-and-forget systems are still running their original overnight schedule without ever being updated to take advantage of midday rates that did not exist when they were installed.
Demand tariffs are the most dangerous mismatch.
On a demand tariff, your bill includes a charge based on your single highest 30-minute consumption spike during the month. One afternoon running the oven, air conditioning, dishwasher, and EV charger simultaneously can set a demand charge that adds significantly to your bill for the entire billing period.
A battery that actively manages for this will discharge ahead of high-consumption events to reduce the household’s grid draw. A battery running a standard TOU schedule has no concept of demand management, and in some cases can make things worse by being depleted at exactly the wrong moment.
Dynamic and wholesale pricing requires a different approach again. On a plan like Amber Electric’s, the electricity rate changes every 30 minutes in line with the new wholesale spot market. Prices can spike sharply during demand events and go negative when the grid has surplus renewable generation. A fixed-schedule battery ignores all of this. The only way to capture the value of dynamic pricing is with software that reads live price signals and responds in real time.
The control question nobody explains at the point of sale
Most batteries come with their own energy management software, either built into the inverter or running through a manufacturer’s cloud app. The main brands each have their own systems:
- Tesla uses Powerwall’s onboard intelligence with weather forecasting and tariff scheduling
- Sigenergy runs a cloud-based management system with GPT-assisted recommendations
- Sungrow, Enphase, and FoxESS each have proprietary platforms with varying levels of tariff awareness
These are primarily designed for TOU and flat rate plans and work reasonably well in those environments.
Third-party controllers like Amber’s SmartShift take a different approach. Rather than following a schedule, SmartShift reads live wholesale prices and makes charge and discharge decisions at an individual site level, factoring in your specific battery capacity, household load profile, and the current state of the market.
What most installers do not explain is that you cannot run both simultaneously.
Enrolling your battery in Amber SmartShift requires you to disable your battery manufacturer’s own scheduling software entirely. It is a full handover of control, not an add-on layer. For those on a dynamic tariff, that handover generally makes financial sense. SmartShift is making decisions that the onboard software was never designed to make. But it introduces a different kind of dependency.
In February 2026, Amber confirmed a widespread outage that stopped all charge and discharge commands across every supported battery brand at once. When the controller’s cloud is unavailable, the battery loses its optimisation entirely. This is not unique to Amber.
Manufacturer cloud systems carry similar risks, as SolarEdge customers discovered when a server issue left batteries operating in degraded mode for weeks. It is worth understanding before handing over control.
Checking whether your setup actually matches your plan
Most set up their battery, download the manufacturer’s app, and never look at the software configuration again. The app shows a charge level, some generation graphs, and the battery appears to be doing something sensible.
Whether it is doing the right thing for your specific tariff is a different question.
3 steps are worth taking:
- Identify your actual tariff structure, not just the plan name. Your retailer’s website or your bill’s pricing schedule will show whether you are on flat rate, TOU, demand-based, or a combination, and whether you have a solar sponge window or time-varying FiT layered on top.
- Open your battery app and find what mode or schedule it is running. Check whether the charge schedule matches your cheapest grid window, whether the discharge timing aligns with your peak period, and whether there is any demand management setting available.
- If you are on a demand tariff or a dynamic pricing plan, check whether your battery brand supports those natively. Most do not handle demand tariffs without additional configuration, and dynamic pricing requires either a retailer-integrated controller or accepting that your battery is leaving real money on the table.
The battery is the hardware. The software is the strategy.
The federal government’s decision to require VPP capability as a condition of the battery rebate from May 2026 means most batteries being installed right now are technically capable of sophisticated tariff optimisation.
The hardware can do more than its default settings suggest.
The software, in most cases, has not been configured to use that capability. Most homeowners will never know what they are missing. Buying a battery without understanding your tariff structure is like buying a car without knowing what fuel it runs on. The investment is real. Whether it performs as expected depends entirely on whether the software operating it understands the environment it is working in.
Energy Matters has been in the solar industry since 2005 and has helped over 40,000 Australian households in their journey to energy independence.
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