Have questions about battery systems or want personalised advice for your home?
Contact Us →Have questions about battery systems or want personalised advice for your home?
Contact Us →Calculate your solar battery cost, federal rebate (~$5,000), and annual savings. Free ROI report in 60 seconds.
Quick answer: At Battery IQ, we help Australians calculate the true cost and savings of home batteries. Solar battery prices range from $8,000-$17,000 installed, minus the ~$5,000 federal rebate. Typical payback is 5-8 years. Enter your suburb above for personalised calculations based on your local sun hours and electricity rates.
Your personalised Battery ROI Report includes real data for your postcode — no generic estimates.
Your suburb's average daily sun hours based on Bureau of Meteorology data.
Exact rebate amount for your battery size (~$5,000 for a typical 13.5kWh system).
Additional state rebates you may qualify for (VIC, NSW, QLD, SA).
Projected yearly savings based on your area's electricity rates.
Suggested capacity based on typical usage for your suburb.
5-year and 10-year projections with clear assumptions.
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 →
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Our calculator uses authoritative Australian data sources to provide accurate, personalised battery savings estimates.
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
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)
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)
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
Learn more about home batteries:
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.
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.
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.
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.
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.
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.
Most quality batteries offer 10-year warranties guaranteeing 70-80% capacity retention after 10 years. Tesla Powerwall: 10 years, unlimited cycles, 70% capacity. BYD: 10 years, 80% capacity. Sungrow: 10 years, 60% capacity (lower guarantee). Enphase: 10-15 years depending on model. Longer warranty doesn't always mean better - check the capacity guarantee percentage, not just duration.
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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