A 20kW system in Perth is a common search for households balancing roof space and daytime usage. At about 6 peak sun hours/day in the Perth climate reference, expect roughly 120.0 kWh/day before losses. Compare CEC-accredited quotes on MrSolar.
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Indicative 2026 pricing in Perth: a typical 6.6kW system often quotes around $4,800–$7,200 after the STC discount (strong WA sun hours; varies by roof, brand and export limits). See our solar cost guide.
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| Metric | Value |
|---|---|
| 20kW — daily | 120.0 kWh/day |
| 20kW — annual | 43,800 kWh/year |
Using 6 peak sun hours as a planning figure for Perth, a 20kW array can produce about 120.0 kWh/day and ~43,800 kWh/year. North vs east-west layouts, shade and inverter clipping change real results — insist on a site assessment.
STCs apply (Perth metro typically treated as Zone 3 in MrSolar’s state defaults). Synergy SolarFIT context and retailer plans affect export value. Indicative 6.6kW after STC often $4,800–$7,200. For Zone 3, MrSolar’s master table (spot $39.85 as of 2026-08-05) points to about $1,435 in STCs for a comparable residential size class. Indicative installed pricing still varies widely with roof complexity.
Perth homes with pools, ducted AC, EVs or high WFH loads more often land at 20kW+. Confirm Western Power / Horizon Power export and phase limits early.
Western Power dominates metro Perth; Horizon Power covers regional WA. Inverter energy system applications and export constraints vary by feeder — get the approval pathway in the quote pack. Your installer should document the pathway for a 20kW system at Perth.
Compare three CEC-accredited quotes. Require panel/inverter models, STC pass-through, export limits, and workmanship warranty. Excellent generation potential. Make Western Power approval and hot-climate hardware the centre of your comparison, not just dollars-per-watt.
Confirm CEC accreditation, exact product models, STC/battery subsidy line items, DNSP/export assumptions, and workmanship warranty length in writing. Compare at least three like-for-like quotes via MrSolar.
Get free 20kW solar quotes for Perth from CEC-accredited installers 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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