For Australian homeowners in 2026, eliminating your electricity bill entirely, especially with an Electric Vehicle (EV) and a heat pump, typically requires a 10kW to 13kW solar PV system complemented by a 10kWh to 13.5kWh home battery. While a standard 6.6kW system remains popular, it’s often insufficient to cover the increased energy demands of modern electrified homes seeking true bill elimination. With federal STC rebates decreasing annually and state battery incentives evolving, understanding your precise energy needs is more critical than ever.
Understanding Your Household’s True Energy Appetite
The first step to sizing your solar system is accurately assessing your current and future electricity consumption. Most Australians are familiar with their grid usage, but adding an EV and a heat pump significantly shifts this baseline.
Average Household Electricity Consumption (Excluding EVs & Heat Pumps)
Average daily electricity usage varies widely across Australia, influenced by household size, climate, and appliance use. As of 2026, here’s a general guide:
| Household Size | Average Daily Consumption (kWh) |
|---|---|
| 1 person | 8.65 kWh |
| 2 persons | 13.88 kWh |
| 3 persons | 16.08 kWh |
| 4 persons | 18.99 kWh |
| 5+ persons | 22.98 kWh |
State-by-state variations are also notable, with Victoria averaging around 12.64 kWh/day and Tasmania closer to 23.61 kWh/day due to climate and lifestyle.
Factoring in EVs and Heat Pumps
Electrifying your home means substantial additions to your energy load:
- Electric Vehicles (EVs): A typical EV driven 15,000 km per year, consuming 15-20 kWh/100km, will add approximately 2,250 to 3,000 kWh annually, or 6-8 kWh per day, to your household’s electricity demand. This is a significant increase that a standard solar system alone cannot always offset during daylight hours. Consider how home charging integrates with your solar production. For more on charging, see our guide: Best EV Home Chargers in Australia 2026: A Buyer’s Guide to Costs and Installation.
- Heat Pump Hot Water Systems: Replacing a traditional electric or gas hot water system with a highly efficient heat pump can save money but still uses electricity. A typical 200-300L heat pump can consume 1,500 to 3,000 kWh annually, equating to 4-8 kWh per day. These systems are far more efficient than resistive electric models, but their operation still needs to be accounted for in your solar sizing. Learn more about their benefits here: Heat Pump Hot Water Australia 2026: Slash Bills by $900+ with Rebates.
Combining these, a 4-person household could see its daily consumption jump from ~19 kWh to 30-35 kWh per day with an EV and heat pump. This is the figure your solar system needs to match or exceed.
The Ideal Solar System Size for Bill Elimination
To truly eliminate your electricity bill, your solar system must generate enough power to cover your total daily consumption, including any new loads. In Australia, depending on your location (solar zone) and roof orientation, you can expect an average of 4-5 peak sun hours per day.
- 6.6kW System: Generates approximately 26.4 - 33 kWh per day (6.6kW x 4-5 hours). This size is often sufficient for a standard 3-4 person household without an EV or heat pump. However, with these additional loads, it generally won’t eliminate your bill entirely without significant behavioural changes or a large battery for load shifting.
- 10kW System: Generates approximately 40 - 50 kWh per day (10kW x 4-5 hours). This is often the minimum recommended size for a 4+ person household looking to run an EV and a heat pump and achieve significant bill reduction, especially when paired with battery storage. It provides a healthy buffer for higher consumption days and allows for greater self-consumption.
- 13kW+ System: Generates approximately 52 - 65 kWh per day (13kW x 4-5 hours). For larger homes, multiple EVs, a swimming pool, or significant air conditioning use, a 13kW system or larger provides the best chance of total bill elimination and energy independence. The cost-per-watt often decreases with larger systems, making them excellent value.
“The grid is flooded with cheap solar power during the day, making your daytime exports far less valuable than they used to be. The era of generous, set-and-forget solar feed-in tariffs has ended.”
This shift means maximising self-consumption is paramount. A larger system generates more power during the day, allowing you to run high-demand appliances (like charging an EV or heating water) directly from solar, rather than exporting excess for low feed-in tariffs.
Integrating Battery Storage: Essential for True Bill Elimination
With declining feed-in tariffs (FiTs) – typically ranging from 3-10 cents per kWh in 2026 – exporting excess solar to the grid is far less lucrative than using it yourself. This makes a home battery system virtually essential for eliminating your electricity bill, especially with significant evening loads like EV charging or heat pump operation.
Batteries store your surplus daytime solar generation for use during the evening peak, when grid electricity prices are highest (often 30-40 cents per kWh). This avoids costly imports and allows you to power your home and charge your EV with your own clean energy around the clock. Popular battery capacities for electrified homes range from 10kWh to 13.5kWh.
Popular Home Battery Options & Costs (2026)
Thanks to federal and state rebates, battery storage is becoming more accessible. Here are indicative installed prices for popular battery sizes, after the federal rebate:
| Battery Capacity (Usable) | Indicative Installed Price (AUD, after federal rebate) |
|---|---|
| 10 kWh | $8,880 - $13,500 |
| 13.5 kWh (e.g., Tesla Powerwall 3) | $14,850 - $17,000 |
Leading brands in the Australian market include Tesla (Powerwall 3), Sungrow (SBR HV), BYD (Battery Box HVM), Alpha ESS, and Sigenergy (Sigenstor). Many modern batteries, like the Tesla Powerwall 3, integrate a hybrid inverter, simplifying new installations or upgrades. For a deeper dive into battery options, read our guide: Best Home Batteries Under AUD$10,000 in Australia 2026: Value, Features & Real-World Performance.
Current Costs and Rebates in 2026
Investing in solar in 2026 benefits from ongoing government incentives, though their structure continues to evolve.
Federal STC Rebate (Small-scale Technology Certificates)
The federal Small-scale Renewable Energy Scheme (SRES) provides an upfront discount on solar installations via Small-scale Technology Certificates (STCs). The value of STCs decreases annually as the scheme winds down towards 2030. For 2026, typical STC rebates are:
- 6.6kW system: ~$3,000 – $3,800
- 10kW system: ~$4,500 – $5,500
Your installer will typically apply this as an upfront discount to your system price.
Federal Battery Rebate (Cheaper Home Batteries Program)
Effective May 1, 2026, the federal battery rebate transitioned to a tiered structure, offering approximately $243–$244 per kWh for the first 14 kWh of usable capacity. This can significantly reduce the upfront cost of adding storage.
State-Specific Incentives (2026)
Several states and territories offer additional solar and battery incentives:
- Victoria: The Solar Homes Program continues to offer solar panel rebates and interest-free loans in 2026.
- New South Wales: While the previous upfront battery discount has ended, the Energy Savings Scheme (ESS) and Peak Demand Reduction Scheme (PDRS) provide other incentives. Some retailers also offer time-varying feed-in tariffs that reward evening exports, making batteries more attractive.
- South Australia: Benefits from the Home Battery Scheme and Virtual Power Plant (VPP) incentives.
- Western Australia: The Residential Battery Scheme can be combined with the federal rebate, and the Distributed Energy Buyback Scheme (DEBS) offers time-of-export feed-in tariffs (up to 10c/kWh peak).
- ACT: The Sustainable Household Scheme provides low-interest loans up to $15,000 for batteries and other energy upgrades.
- Queensland, Tasmania, Northern Territory: State-specific battery subsidies or affordable loan programs have largely concluded. However, the NT offers a high “Super FiT” (up to 18.66 c/kWh) for smart meter customers exporting during the evening peak, incentivising battery storage.
For a comprehensive overview of battery rebates, see: Unlock $3,700+ in Rebates: Your 2026 Guide to Australian Home Battery Systems.
Indicative Solar System Costs (Installed, After Federal STC Rebate, 2026)
| System Size | Panels Only (AUD) | With 10-13.5kWh Battery (AUD, after federal battery rebate) |
|---|---|---|
| 6.6kW | $4,000 – $6,500 | $12,000 – $20,000 |
| 10kW | $6,000 – $10,000 | $18,000 – $27,000 |
| 13kW | $7,500 – $13,000 | $22,000 – $32,000 |
Note: Prices are national averages and can vary significantly by state, component quality, and installation complexity. For example, a 6.6kW system in Melbourne could be $2,800–$5,600 after rebates, while in Sydney it might be $5,000–$8,000.
Choosing the Right Components for Your System
Beyond size, the quality of your solar panels and inverter is paramount for long-term performance and bill elimination.
Solar Panels
In 2026, look for premium N-type panels with efficiencies exceeding 23% and robust warranties. Top brands known for performance and reliability in Australian conditions include:
- SunPower Maxeon 6: Industry-leading 40-year warranty and high efficiency.
- REC Alpha Pure-RX: Strong efficiency, low degradation, and 25-year warranty.
- Jinko Tiger Neo N-type: Excellent efficiency from a global Tier 1 manufacturer.
- Trina Vertex S+: Proven track record and strong bankability.
- AIKO Neostar 2P: High efficiency with all-back-contact technology.
Solar Inverters
For systems with batteries, a hybrid inverter is crucial for seamless integration and often provides blackout protection. Key inverter brands and their strengths in 2026 include:
- Fronius (GEN24 Plus): Renowned for reliability and often comes with a 10-year warranty (with registration). Excellent for solar-only or hybrid setups.
- Sungrow (SHRS/SBR): An excellent all-rounder, offering good performance, strong local support, and flexible battery options. Often considered one of the best value hybrid solutions.
- Sigenergy (Sigenstor): A newer player with advanced hybrid inverter and modular battery designs, known for strong blackout protection.
- SolarEdge / Enphase: Ideal for complex roofs or systems with significant shading, as they optimise panel-level performance using optimisers or microinverters.
Feed-in Tariffs: The Reality in 2026
As mentioned, the era of generous, fixed feed-in tariffs (FiTs) is largely over. In 2026, typical FiTs range from 3-10 cents per kWh across most states. Some retailers offer higher time-varying FiTs during evening peak demand periods, particularly in NSW, WA, and NT, which can incentivise battery owners to export strategically. However, the primary financial benefit of solar and battery systems now comes from self-consumption – avoiding buying expensive grid electricity – rather than selling excess power back to the grid.
Getting the Best Quotes
When seeking quotes for your solar and battery system, always:
- Engage CEC-Accredited Installers: Ensure your installer is Clean Energy Council (CEC) accredited for both design and installation. This ensures quality and eligibility for rebates.
- Compare Multiple Quotes: Obtain at least three detailed quotes. Prices for the same system size can vary by thousands of dollars. Focus on the overall value, component quality, warranties, and installer reputation, not just the lowest upfront price.
- Specify Your Needs: Clearly communicate your desire to eliminate your electricity bill, including current and future plans for EVs and heat pumps. A good installer will design a system tailored to these specific demands.
Bottom Line
To truly eliminate your electricity bill in Australia in 2026, especially with an EV and a heat pump, a 10kW to 13kW solar system paired with a 10kWh to 13.5kWh battery is the most effective solution. While the upfront cost of such a system, ranging from AUD $18,000 to $32,000 after rebates, is a significant investment, the long-term savings from avoiding high grid electricity prices and maximising self-consumption make it a financially sound decision. Federal STC and battery rebates, alongside state-specific incentives, continue to make this investment more accessible. Prioritise quality components and reputable installers to ensure a reliable and high-performing system for decades to come.