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Have questions about battery systems or want personalised advice for your home?
Contact Us →Get in Touch
Have questions about battery systems or want personalised advice for your home?
Contact Us →Home Energy Assessment Australia 2026
We're accepting a limited number of households for early access to Australia's most comprehensive energy assessment tool. Battery sizing, best retail plan, rebate eligibility, and 15-year savings projections. Free personalised report included.
Quick answer: At Battery IQ, we assess your whole energy picture - not just batteries. Our assessment analyses your bill, finds the best retail plan from 15,000+ options, sizes the right battery for your usage, calculates rebate eligibility, and projects 15-year savings. Solar battery prices range from $8,000-$17,000 installed, minus the ~$5,000 federal rebate. Enter your details above for a personalised report.
What Your Energy Assessment Includes
Your personalised report covers everything from bill analysis to battery sizing. As an early access member, you'll also get priority access to new features as we roll them out.
Local Sun Hours
Your suburb's average daily sun hours based on Bureau of Meteorology data.
Federal Rebate Value
Exact rebate amount for your battery size (~$5,000 for a typical 13.5kWh system).
State Rebate Stacking
Additional state rebates you may qualify for (VIC, NSW, QLD, SA).
Annual Savings Estimate
Projected yearly savings based on your area's electricity rates.
Recommended Battery Size
Suggested capacity based on typical usage for your suburb.
Payback Timeline
5-year and 10-year projections with clear assumptions.
How Much Does a Solar Battery Cost in Australia?
Solar battery prices have dropped 40% since 2022. Here's what you'll pay in 2026.
| Battery | Capacity | Installed Price | Federal Rebate | Net Cost |
|---|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | $14,000-$16,000 | ~$4,500 | $9,500-$11,500 |
| BYD Battery-Box HVS | 10.2 kWh | $9,000-$11,000 | ~$3,400 | $5,600-$7,600 |
| Sungrow SBR096 | 9.6 kWh | $8,000-$10,000 | ~$3,200 | $4,800-$6,800 |
| Enphase IQ 5P | 5 kWh | $6,000-$8,000 | ~$1,700 | $4,300-$6,300 |
Prices include installation. Federal rebate based on 2026 STC rate (8.4 STCs × $40). Actual prices vary by installer and location. See full comparison →
What affects price?
- • Battery capacity (kWh)
- • Brand and chemistry
- • Installation complexity
- • Inverter compatibility
Cost per kWh
- • Budget: $600-$800/kWh
- • Mid-range: $800-$1,000/kWh
- • Premium: $1,000-$1,200/kWh
- • After rebate: subtract ~$336/kWh
Price trend
- • 2022: ~$1,400/kWh avg
- • 2024: ~$1,000/kWh avg
- • 2026: ~$850/kWh avg
- • Falling ~10-15%/year
Why We're Limiting Access
We analyse each household individually to ensure accurate savings estimates. That means we work with a limited number of homes each month.
Full Calculator Access
Priority access to our battery savings calculator, with new features added monthly.
Priority Support
Direct email access to our team for any battery questions.
Shape the Product
Your feedback directly influences what we build next. Founding members get a say.
How We Calculate Battery ROI
Our assessment uses authoritative Australian data sources to provide accurate, personalised energy savings estimates.
Wholesale Electricity Prices
Real-time and historical data from AEMO (Australian Energy Market Operator) via the OpenElectricity API. We track 5-minute wholesale prices across all NEM regions.
Source: api.openelectricity.org.au
Solar Irradiance Data
Location-specific sun hours from Bureau of Meteorology weather stations. We map each suburb to the nearest BOM station for accurate solar generation estimates.
Source: Bureau of Meteorology (BOM)
Federal Rebate Calculation
STC (Small-scale Technology Certificate) rates from the Clean Energy Regulator. Current rate: 9.3 STCs per kWh × ~$40 STC price = ~$372/kWh rebate.
Source: Clean Energy Regulator (CER)
Retail Tariff Data
Energy plan pricing from the Consumer Data Right (CDR) energy API. We compare time-of-use, flat rate, and wholesale pass-through tariffs.
Source: Energy Made Easy CDR API
Our ROI Calculation Methodology
- 1Model your usage pattern: We estimate when you use electricity (morning, evening peak, overnight) based on typical Australian household profiles or your actual data if provided.
- 2Calculate solar generation: Using your location's average sun hours and solar system size, we estimate daily/monthly solar production.
- 3Simulate battery operation: We model daily charge/discharge cycles - storing excess solar during the day, discharging during evening peak.
- 4Apply your tariff structure: Savings depend heavily on peak/off-peak price spread. Time-of-use tariffs typically yield 30-50% better ROI than flat rates.
- 5Factor in battery degradation: Batteries lose capacity over time (typically 2-3% per year). We model this over the 10-20 year expected lifespan.
- 6Include federal rebate: We apply the current STC rebate (~$372/kWh) to reduce your effective upfront cost.
Learn more about home batteries:
Frequently Asked Questions About Solar Batteries
How much does a solar battery cost in Australia?
Solar battery prices in Australia range from $8,000-$17,000 fully installed in 2026 for typical residential systems. A typical 10kWh battery costs $10,000-$12,000 before rebates. After the federal rebate (~$3,700 for 10kWh), your net cost is $6,300-$8,300. Premium brands like Tesla Powerwall 3 (13.5kWh) cost $14,000-$16,000 installed, or ~$9,000-$11,000 after the ~$5,000 rebate. Larger capacity systems (20kWh+) can exceed $20,000 installed. Price per kWh has dropped 40% since 2022.
How long do solar batteries last?
Solar batteries typically last 10-20 years, with most manufacturers now offering 10-15 year warranties guaranteeing 70-80% capacity retention. Lithium iron phosphate (LFP) batteries like BYD can exceed 6,000 cycles (16+ years of daily use). Tesla Powerwall uses NMC chemistry rated for 5,000+ cycles. As battery technology improves and costs decline, many homeowners may choose to upgrade before end-of-life to access newer capabilities, similar to how solar panel owners today often upgrade small older systems. Battery lifespan depends on: depth of discharge (shallower cycles = longer life), operating temperature (avoid extreme heat), and charge/discharge rates.
Is a solar battery worth it in Australia?
Yes, for most Australian households in 2026. With the federal rebate reducing costs by ~$5,000, typical payback is 5-8 years with a 10-20 year lifespan. Batteries are worth it if you: (1) Have solar and export excess during the day, (2) Use time-of-use tariffs with 20c+ peak/off-peak spread, (3) Want blackout protection, (4) Can benefit from battery arbitrage strategies. ROI is best for high-usage households (20+ kWh/day) on evening-heavy usage patterns.
What size battery do I need for my home?
Most Australian homes need a 10-13.5kWh battery. Calculate your evening usage (typically 8-15kWh from 4pm-10pm) to size correctly. A 10kWh battery suits: 15-20kWh daily usage, 5-6kW solar, 2-3 person household. A 13.5kWh battery suits: 20-30kWh daily usage, 6-10kW solar, 4+ person household. Oversizing wastes money - you pay for capacity you don't use. Our calculator recommends optimal size based on your actual usage.
What is the typical payback period for a home battery?
Typical payback periods range from 5-10 years in 2026. Your payback depends on which arbitrage strategies you use: solar arbitrage (storing excess solar to use later), import arbitrage (charging from cheap off-peak grid rates), export arbitrage (selling stored energy at peak prices), or fixed VPP payments (receiving regular income for grid services). High usage households on time-of-use tariffs see 5-7 year payback. Active arbitrage strategies can achieve 4-6 years. Moderate usage on flat tariffs takes 8-10 years. The federal rebate (~$5,000 for a 13.5kWh battery) reduces payback by 2-3 years compared to pre-July 2025.
How does BatteryIQ calculate home battery ROI?
At Battery IQ, we calculate battery ROI using: (1) Your actual electricity usage patterns and tariff structure, (2) Real-time wholesale electricity prices from AEMO, (3) Location-specific solar data from BOM weather stations, (4) Current federal rebate of ~$336/kWh (8.4 STCs × $40 in 2026), (5) Battery efficiency, degradation rates, and warranty periods. We model daily charge/discharge cycles for realistic annual savings estimates.
What battery warranty should I expect?
Most quality batteries offer 10-year warranties guaranteeing 70% capacity retention after 10 years. Tesla Powerwall: 10 years, unlimited cycles, 70% capacity. BYD: 10 years, 70% capacity (increased from 60% in November 2024). Sungrow: 10 years, 70% capacity (increased from 60% in October 2024). Enphase: 10-15 years depending on model. Longer warranty doesn't always mean better - check the capacity guarantee percentage, not just duration.
Is a home battery worth it without solar panels?
Yes, for some households. Grid-only batteries use import arbitrage - charging from cheap off-peak rates (often 15-20c/kWh) and discharging during expensive peak times (35-50c/kWh). The arbitrage opportunity is smaller than with solar, but can work well with time-of-use tariffs. ROI typically 10-12+ years without solar vs 5-8 years with solar. Adding export arbitrage or fixed grid service payments improves grid-only battery economics significantly.
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