What does solar cost in Perth in 2026?

Solar system prices in Perth fell dramatically between 2010 and 2022 — by more than 70% in real terms. Since 2022, prices have largely stabilised. If you're getting quotes in 2026, here's what to expect, what the range reflects, and how to evaluate whether a quote represents genuine value.

Perth solar system price ranges (mid-2026)

Prices below are for supply and installation, after the STC discount has been applied (the STC is a point-of-sale reduction applied by all installers). GST is included.

| System size | Quality tier | Installed price range | |---|---|---| | 6.6kW solar only | Standard (Tier-1 panels, Goodwe/Growatt inverter) | $5,000–$7,500 | | 6.6kW solar only | Quality (premium panel brand, Fronius/Sungrow inverter) | $7,500–$10,000 | | 10kW solar only | Standard | $7,500–$10,500 | | 10kW solar only | Quality | $10,500–$14,000 | | 13.3kW solar only | Standard | $9,500–$13,000 | | 13.3kW solar only | Quality | $13,000–$18,000 |

Prices are indicative for Perth metropolitan area. Hills, regional, and complex-access sites (steep pitches, multi-storey) attract labour surcharges.

What STC discount has already been applied?

The prices above already reflect the STC rebate. As of 2026 with a 5-year deeming period and approximately $37/STC:

• 6.6kW system: approximately $1,600–$1,700 STC discount applied
• 10kW system: approximately $2,500–$2,600 STC discount applied
• 13.3kW system: approximately $3,400–$3,500 STC discount applied

If a quote shows a "before STC" and "after STC" price, the "after STC" price is what you pay. The before-STC number is largely a marketing construct.

What drives the price variation?

Panel quality: Generic Tier-1 panels (Jinko, Trina, Canadian Solar, Risen) are lower cost but have comparable module efficiency and warranty terms to premium brands (REC Group, Q CELLS, Sunpower Maxeon for mono panels). The premium brands typically carry marginally better efficiency (21–22% vs 19–21%), stronger degradation warranties, and longer track records of warranty claim fulfilment.

Inverter quality: Entry-level inverters (Growatt, Goodwe entry-range) are lower cost but have varying monitoring capabilities and warranty terms. Mid-range (Sungrow, Goodwe plus-range) offers solid performance. Premium (Fronius) comes with a strong Australian service network and 10-year warranty options.

Installer overhead: Established Perth installers with in-house crews, apprentices, and local service personnel cost more than sole-trader operations or interstate-based companies using subcontract crews. The premium for an established installer is real — they're more likely to honour warranty call-outs 5–8 years post-installation.

System complexity: Parallel strings for east/west arrays, DC optimisers or microinverters for partial shading, three-phase inverters, and service connections to underground boards all add cost.

Why you shouldn't buy on price alone

The lowest quote is almost always the lowest for a reason:

• Entry-level components (shorter warranties, less local warranty support)
• Reduced installation quality (fewer fixings per panel, lower-grade sealants)
• Higher risk of installer insolvency or non-response to warranty claims

The 3-quote rule applies: Three quotes from CEC-accredited Perth installers, comparing equivalent specifications (same or similar panel wattage, comparable inverter brand tier), allows you to identify the market rate for a given specification and assess where each installer sits relative to that rate.

A quote 20–30% below the others for the same specification warrants scrutiny, not excitement.

Price stability: why the falls have slowed

From 2010 to 2022, Perth solar prices fell due to:

• Rapidly declining module manufacturing costs (China)
• Increasing installation scale (labour per-system falling)
• Competitive installer market growth

The falls have slowed since 2022 because:

• Module prices have reached manufacturing floor levels — further falls are marginal
• Labour costs in WA have risen with the broader construction boom
• Supply chain disruptions and shipping costs (partially stabilised)
• Higher system sizes are being sold (10kW vs 6.6kW), increasing average invoice value

Solar remains one of the best-value energy investments for Perth households, but the dramatic year-on-year price falls of the 2010s are not expected to resume.

Indicative payback periods (2026 Perth)

| System | Cost (quality) | Annual savings estimate | Payback estimate | |---|---|---|---| | 6.6kW, no battery | $8,500 | $1,400–$2,000 | 4–6 years | | 10kW, no battery | $12,000 | $1,800–$2,800 | 4–7 years | | 10kW + 10kWh battery | $22,000 (incl. $1,300 WA Battery Incentive) | $2,200–$3,200 | 7–10 years |

Savings range reflects different household consumption profiles and timing. Higher consumption and more daytime home occupancy = faster payback.

Perth solar prices have stabilised in the $5,000–$18,000 range (installed, after STC) depending on system size and quality tier. Prices are already net of the STC rebate. The variation reflects component quality, inverter brand, and installer overhead. Payback periods for a 10kW system are typically 4–7 years at current Perth electricity rates. The price falls of the 2010s have slowed — don't wait for a major price drop that's unlikely to materialise.