How long does solar take to pay off in Victoria?

XTechs Renewables · Solar economics

Updated June 2026 · ~13 min read · By the xTechs team

Solar payback isn't a mystery number your installer pulls from a spreadsheet. It's the result of five inputs you can mostly verify yourself: what you paid (after rebates), how much electricity you generate, how much you use during the day, what your retailer pays for exports, and what you would have paid for grid power anyway.

The five numbers that determine your payback

The formula is simple: net upfront cost ÷ annual savings = payback period in years. The complexity is in getting each input right.

1. Net system cost — installed price minus federal STCs and any Solar Victoria rebate or loan.
2. Annual generation — in Melbourne, multiply system size (kW) by ~1,300 kWh/kW/year.
3. Self-consumption rate — the share of solar you use on-site instead of exporting.
4. Usage rate avoided — what you save per kWh not bought from the grid (typically 25–32 c/kWh all-in).
5. Feed-in tariff earned — what you receive per kWh exported (often 2–6 c/kWh in Victoria in 2026).

What does a solar system actually cost in Victoria in 2026?

After several volatile years, pricing has stabilised in 2026 — but the gap between a budget quote and a quality tier-1 install is still significant. All figures below assume CEC-approved products installed by a CEC-accredited electrician, which is required for rebate eligibility.

Indicative installed cost in Melbourne, mid-2026, including GST and after federal STC rebate. Premium-tier systems (e.g. AIKO panels with GoodWe or Sigenergy inverters) sit toward the upper end.

The two rebates that change the maths

In Victoria, two separate rebates stack — and both apply before you calculate payback.

Federal STC rebate (Small-scale Technology Certificates). Your installer claims STCs on your behalf at the point of sale. The rebate is based on system size and your zone; it decreases slightly each year as the deeming period steps down. On a 6.6 kW system in Melbourne, STCs typically reduce the upfront cost by roughly $2,000–$2,800 in 2026.

Solar Homes rebate (Solar Victoria). Eligible owner-occupiers can receive up to $1,400 off solar PV, with an optional interest-free loan for the same amount. Income must be under the current cap — see our rebate eligibility guide for the $150,000 threshold from 1 July 2026.

What you're paying for electricity in 2026

Your payback calculation is only as accurate as your usage rate. Victorian residential tariffs in 2026 typically look like this:

• Average usage rate: 25–32 c/kWh (depending on plan and distributor).
• Daily supply charge: $1.00–$1.40/day — solar doesn't reduce this.
• Time-of-use peak: 35–45 c/kWh on many plans (usually 3–9 pm weekdays).
• Off-peak / solar sponge windows: 15–22 c/kWh — worth shifting loads into these periods.

For payback estimates, we use 28 c/kWh as a mid-case all-in usage rate unless we have your actual bill. The usage rate matters far more than chasing the highest feed-in tariff.

Feed-in tariffs in Victoria — 2026 reality check

Feed-in tariffs have fallen sharply since 2022. In 2026, most Victorian households receive 1.5–6 c/kWh for exported solar, depending on retailer and plan conditions. The table below shows typical ranges — not unconditional headline rates.

How to read the FiT table

"Maximum" rates are often conditional. A 10 c/kWh FiT might apply only to the first 10 kWh exported per day, then drop to 4–5 c/kWh. On a 6.6 kW system in Melbourne exporting heavily on a weekday, you can hit that cap by early afternoon.

Amber Electric works differently — live wholesale prices in 30-minute intervals. Average rates sit around 5–8 c/kWh, but can spike above $1/kWh in summer peaks or go negative in autumn. This model suits households with batteries who can export strategically; see our Amber VPP guide.

Worked examples: four typical Victorian households

The scenarios below use 2026 pricing, a 1,300 kWh/kW generation factor, and a 28 c/kWh usage rate unless noted.

The 25-year picture: total return on investment

Payback is the headline number, but the bigger story is what happens after the system has paid for itself. Quality tier-1 panels carry 25–30 year performance warranties. Inverters are typically warranted for 10 years and last 12–18 in practice. A well-installed system delivers free electricity for most of two decades after break-even.

Indicative 25-year ROI, mid-case assumptions (6.6 kW system, $4,500 net cost, $1,100 annual savings, 0.5% annual panel degradation, 3% annual electricity price inflation).

That works out to an effective internal rate of return of around 18–22% per year, depending on how aggressively you model electricity price inflation — well ahead of cash, term deposits, or balanced share portfolios over the same period.

What can blow out your payback (and what doesn't)

Things that genuinely shift the maths

• Low self-consumption. Empty weekdays with evening-only usage pushes payback from 4 years toward 6–7.
• Heavy shading or poor roof orientation. South-facing arrays generate ~70% of north-facing output; afternoon shade can cut output 15–25%.
• Cheap panels and budget inverters. A $3,500 6.6 kW unknown-brand system often needs inverter replacement around year 6–7.
• High FiT, high usage rate plans. Run the full annual bill comparison — not just the feed-in tariff headline.

Things that matter less than you'd think

• Feed-in tariff chasing. The difference between 2 c and 6 c FiT is ~$200/year for a typical household. Shifting 30% to 50% self-consumption is worth ~$560/year on the same system.
• Panel brand prestige (beyond a quality floor). Jinko Tiger Neo vs AIKO ABC is often 2–4% output difference — installation quality matters more.
• System size beyond a point. 6.6 kW to 10 kW adds ~$2,500 for ~50% more output; 10 kW to 13.2 kW has diminishing returns on many suburban roofs.

Self-consumption is the lever (a short note on batteries)

Victorian feed-in tariffs have fallen from 8–10 c/kWh in 2022 toward 1.5–3 c in 2026. Solar pays back fastest when you use the energy you generate.

1. Shift discretionary loads into daylight hours — dishwasher, washing machine, pool pump, EV charging between 10 am and 3 pm can lift self-consumption from 25% to 40%+.
2. Consider a battery once daytime electrification is maxed out — the federal Cheaper Home Batteries Program provides roughly $330 per usable kWh via STCs. Batteries may extend payback slightly but dramatically increase self-sufficiency.

Quick payback calculator — do it in 5 minutes

1. System cost after rebates — use your quote total including GST, minus STCs and Solar Victoria rebate.
2. Annual generation — system kW × 1,300 (e.g. 6.6 × 1,300 = 8,580 kWh/year).
3. Estimate self-consumption — empty weekdays: 20–30%; someone home most days: 40–50%; with battery: 70–85%.
4. Annual saving — (self-consumed kWh × usage rate) + (exported kWh × feed-in tariff). Use 28 c/kWh usage and 3 c/kWh export if unsure.
5. Divide. System cost ÷ annual saving = payback in years.

The bottom line for Victorian households in 2026

• 5 kW system: 4.5 – 6 years
• 6.6 kW system: 4 – 5.5 years
• 10 kW system: 3.5 – 5 years (faster with electrification)
• 10 kW solar + 10 kWh battery: 4 – 6 years

After payback, you're looking at 15–20 years of essentially free electricity — with total 25-year savings commonly in the $30,000–$50,000 range for a well-sized system. If you're in the $150,000–$210,000 income band for Solar Homes, apply before 30 June 2026.

Published June 2026 · xTechs Renewables Pty Ltd · ABN 30 673 983 572 · REC 36065 · CEC Accredited

Serving Melbourne, Geelong, Mornington Peninsula & Regional Victoria

Pricing, rebate and feed-in tariff figures in this article are accurate as at June 2026 based on published Essential Services Commission, Solar Victoria, Clean Energy Regulator, and retailer data. Individual quotes and payback periods will vary. All calculations are indicative and not financial advice — get a tailored proposal before making a decision.

Guide for Melbourne & Victoria homeowners on solar payback and ROI. See our solar rebates hub, residential solar, and battery storage pages for system options.