Solar decisions improve when you rough out system size, STC value, payback and battery needs before sales pressure hits. MrSolar’s calculator hub gathers free Australian tools for homeowners and small businesses — from STC rebate estimates to payback and EV charging cost. Use them to set expectations, then validate everything with three CEC-accredited installer quotes that include real DNSP and incentive line items.
Tell us about your home. We'll match you with 3 local installers.
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.
Free for homeowners. Participating installers pay MrSolar a lead fee when matched — that does not buy a higher ranking in our guides or reviews. See how we match quotes and is MrSolar legit?
Tools cover system size, suburb-level output planning, roof space vs array size, STC rebates, savings and payback, battery sizing, FiT comparison, solar vs grid cost, EV charging cost, off-grid loads and commercial ROI. Each calculator is a planning aid, not a contract. After install, revisit “What you can estimate here” using your app’s import/export charts — that feedback loop is how solar calculators Australia stays aligned with real tariffs and DNSP behaviour. Because solar calculators tools decisions are site-specific, use monitoring or bill interval data where you have it, then ask each CEC-accredited installer to reconcile their design to those facts.
Generic overseas calculators miss STC zones, deeming years, Cheaper Home Batteries Program discounts (~$372/kWh usable) and low FiT reality. Our tools are framed for NEM and WA contexts so you do not overstate export income. Homeowners comparing Solar Calculators Australia — Free Tools to Size, Save & Plan should treat vague wording as incomplete — especially around CEC accreditation and the Cheaper Home Batteries Program planning figure of ~$372/kWh usable where storage is involved. Australian 2026 context still rewards self-consumption over FiT hunting; when reading “Why Australian-specific maths matters”, check whether the advice pushes daytime loads, EV charging, or storage instead of unlimited export assumptions.
Start with system size and suburb output, check STC value, then run payback/savings. If evenings look expensive or export is limited, open the battery size calculator. EV owners should add the charging cost tool before finalising inverter capacity. Because solar calculators tools decisions are site-specific, use monitoring or bill interval data where you have it, then ask each CEC-accredited installer to reconcile their design to those facts. If two quotes disagree on “Suggested order for first-time buyers”, ask both to show workings with as-of dates (STC spot and subsidy rules) rather than accepting a verbal reassurance.
Shade, roof obstacles, inverter clipping, tariff changes and DNSP export caps are site-specific. Treat outputs as ranges. CEC-accredited installers refine the model after seeing your roof and bill pattern. If two quotes disagree on “Limits of any online calculator”, ask both to show workings with as-of dates (STC spot and subsidy rules) rather than accepting a verbal reassurance. On the “Limits of any online calculator” point for solar calculators Australia, write acceptance tests into the quote: product models, STC or battery-subsidy maths, and DNSP/export notes must be explicit for /solar-calculators.
Bring your estimated kW and battery kWh to MrSolar’s quote form. Ask installers to explain gaps between their design and your calculator range — good crews welcome that conversation. On the “Connecting calculator results to quotes” point for solar calculators Australia, write acceptance tests into the quote: product models, STC or battery-subsidy maths, and DNSP/export notes must be explicit for /solar-calculators. MrSolar’s three-quote flow for solar calculators Australia exists so you can reject proposals that skip workmanship warranty length, handover app ownership, or export-limit disclosure.
Commercial ROI and off-grid load tools need interval data and autonomy assumptions. Do not size a remote system from a suburban savings estimator alone. On the “Commercial and off-grid users” point for solar calculators Australia, write acceptance tests into the quote: product models, STC or battery-subsidy maths, and DNSP/export notes must be explicit for /solar-calculators. MrSolar’s three-quote flow for solar calculators Australia exists so you can reject proposals that skip workmanship warranty length, handover app ownership, or export-limit disclosure.
Calculators on this hub are for your planning. When you are ready, request installer quotes separately. MrSolar does not sell your enquiry to non-accredited marketers. Homeowners comparing Solar Calculators Australia — Free Tools to Size, Save & Plan should treat vague wording as incomplete — especially around CEC accreditation and the Cheaper Home Batteries Program planning figure of ~$372/kWh usable where storage is involved. Australian 2026 context still rewards self-consumption over FiT hunting; when reading “Privacy and next steps”, check whether the advice pushes daytime loads, EV charging, or storage instead of unlimited export assumptions.
Pick a calculator, note your range, then get up to three CEC-accredited quotes on MrSolar to lock real figures.
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.
Join over 230,000 Australian homeowners who've used MrSolar to find their installer. No obligation, no spam — just competitive quotes from CEC-accredited professionals.
Get My Free Quotes →Takes 2 minutes. Free forever. CEC-accredited installers only.