Early 2010s Australian solar systems are hitting inverter age, tiny capacities and weak monitoring. Upgrading can mean replacing the inverter, adding panels, moving to a hybrid with a battery, or a full strip-and-replace. This 2026 guide explains technical traps, STC eligibility nuances, DNSP re-approvals and how to brief CEC-accredited upgrade specialists via MrSolar.
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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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Pull generation history, note fault codes and inspect for isolator recalls, cracked modules and corroded roof penetrations. Sometimes a targeted inverter swap restores most value. Sometimes shade from grown trees or a dying array means a clean redesign is cheaper over ten years. A CEC designer should present both paths with costs. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Photograph your switchboard and roof planes before quoting day to cut variation risk.
Switchboards from the rebate boom era may lack space for hybrids, batteries or EV breakers. Asbestos backsheds, brittle tiles and undersized roof members complicate panel swaps. Budget for board upgrades early so quotes stay comparable. Coastal corrosion on ageing rails is a safety issue, not a cosmetic one. A site assessment with photos, stringing plan and shade notes beats brochure layouts; mismatched orientations need separate MPPTs or module-level electronics. Photograph your switchboard and roof planes before quoting day to cut variation risk. A site assessment with photos, stringing plan and shade notes beats brochure layouts; mismatched orientations need separate MPPTs or module-level electronics. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail.
Certificate eligibility depends on what is new, retired and documented. You generally cannot “double dip” endlessly on the same roof without meeting scheme rules. Ask installers to show the STC calculation with zone and the $39.85 as-of 2026-08-05 spot assumption for whatever eligible new capacity is created. Get it in writing. Ask the installer to show the certificate or voucher maths with your postcode, the $39.85 spot assumption (as of 2026-08-05) where STCs apply, and a separate line for any Cheaper Home Batteries Program dollars (~$372/kWh usable since 1 July 2025). Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail.
AC-coupled batteries can sit beside an existing inverter; hybrids may require an inverter replacement. The Cheaper Home Batteries Program offers ~$372/kWh usable on eligible installs (live since 1 July 2025). Confirm DNSP re-approval and whether your old inverter’s export behaviour plays nicely with storage controls. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Photograph your switchboard and roof planes before quoting day to cut variation risk. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail.
Mixing old modules with new strings can create mismatch losses. Clarify which warranties survive the upgrade and who services the hybrid brain. Recommission monitoring so you are not blind during the riskiest months after changeover. Photograph serials again. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Photograph your switchboard and roof planes before quoting day to cut variation risk.
Share existing system details with three CEC-accredited installers through MrSolar. Require like-for-like scopes: what is removed, what is reused, STC assumptions, DNSP fees and blackout expectations during works. The cheapest strip-and-replace is not always the highest NPV path. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Photograph your switchboard and roof planes before quoting day to cut variation risk. Keep decisions grounded in your interval data, roof constraints and written DNSP settings rather than national averages or salesperson screenshots. Save PDFs of every plan, approval and datasheet — warranty claims years later depend on that trail.
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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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