Payback period is the time until cumulative electricity bill savings (plus credits) recover what you paid after rebates. In Australia that means modelling STCs, any state support, realistic FiTs, export limits and — increasingly — battery discounts near ~$372/kWh usable. A honest 2026 payback uses your tariff, not a national brochure average.
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Indicative 2026 pricing: a typical 6.6kW system often quotes around $5,000–$8,000 after the STC discount (metro installs often $5,000–$7,500; premium/regional can run higher). See our solar cost guide.
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Start with out-of-pocket cost after STC (and state rebates if eligible). Estimate annual savings from avoided imports + export credits − any new metering charges. Payback ≈ cost ÷ annual savings. Sensitivity-test FiT cuts and tariff rises separately.
Avoiding 30c imports beats earning 5c FiTs. Homes with daytime occupancy, EVs charged at work-from-home hours, or pools on timers see faster paybacks than empty houses exporting into a capped DNSP feeder.
With four deeming years left in 2026, federal solar discounts are smaller than early SRES years — Zone 3 6.6kW is about $1,435 at ~$39.85/STC (as of 5 August 2026). Waiting further raises net cost as deeming shrinks toward 2030.
Add usable kWh storage only after modelling evening tariff bands and RTE losses. Federal battery support and schemes like VIC Solar Homes battery pathway, QLD Battery Booster or SA Home Battery context can shorten storage payback — if eligibility is real.
Unlimited export assumptions, premium FiTs you cannot get, ignoring inverter replacement, and omitting interest if financed. Ask for a conservative case alongside the sales case.
Compare three CEC-accredited proposals via MrSolar with the same tariff file and export limit. The best payback is often the design that matches your load, not the cheapest dollars-per-watt.
Run payback on real tariffs and export limits — compare CEC-accredited quotes on MrSolar.
Written and reviewed by Daniel (Marketplace lead, Epic Unicorn Pty Ltd). We build pages from Australian solar datasets and regulatory references, then map you to CEC-accredited installers only.
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