19.9kW Solar Panel System for Perth Homes
A 19.9kW solar system in Perth produces approximately 27500–29500 kWh per year — an average of 78 kWh per day across 45–45 high-efficiency 440W panels. Vista Electrical Controls is an EC13384-licensed Perth solar installer. Most 19.9kW customers see a 80-90% reduction in electricity bills with payback in 5–6 years.
19.9kW Solar System: At-a-Glance
| Spec | 19.9kW System |
|---|---|
| System size | 19.9kW |
| Solar panels | 45–45 × 440W Tier-1 |
| Inverter size | 15kW |
| Annual output | 27500–29500 kWh |
| Daily average | 78 kWh (100 summer / 50 winter) |
| Roof space required | 95-110 m² |
| Phase | 3-phase (mandatory) |
| Roof types compatible | Commercial-grade roof attachment, tile/tin, single or multi-storey |
| Annual bill savings | $3500–$5500 (80-90% offset) |
| Payback period | 5–6 years |
| CO2 offset | 20 tonnes / year |
| Vista installs at this size | 40+ systems across Perth |
What Does a Solar System Cost in Perth?
Here’s exactly what’s included in a Tier-1 Perth install in 2026, plus the government rebates that bring your final cost down. Vista provides a fixed quote after a free in-home assessment.
Recommended Equipment for a 19.9kW System
Solar Panels
Jinko Tiger Neo 475W, Trina Vertex S 470W (commercial)
Solar Inverters
GoodWe MT 15K, Sungrow SG15RT, Fronius Symo 15
Solar Batteries (optional)
GoodWe commercial, Sungrow SBR192, BYD HVM commercial
Recommended size: 20kWh
All Vista installations use Tier-1 panels, premium inverters, and our 25-year workmanship warranty. See our full battery range →
Phase Requirements & Network Approval
Recommended phase: 3-phase (mandatory)
Western Power notes: 3-phase commercial connection; Network export limit assessment required
Vista handles all Western Power applications, grid-connection paperwork, and Generation Management Scheme (GMS) approvals on your behalf. There is nothing for you to file or track.
Is a 19.9kW System Right for Your Home?
Best suited for: Small businesses, large households 8+ people, multi-tenant residential
Use case: Commercial-residential boundary, business operations
If your daily electricity usage matches the production profile of a 19.9kW system (78 kWh per day), this size will offset 80-90% of your bills with optimal payback. Larger or smaller? Use the comparison links below.
Real 19.9kW Installs by Vista
40+
19.9kW systems installed by Vista across Perth
Available Across Perth
19.9kW systems are particularly popular in these Perth suburbs. Vista services all 67 suburbs across the Perth metropolitan area.
Light commercial – Wangara, Malaga, Canning Vale, Welshpool
Frequently Asked Questions about 19.9kW Solar Systems
Is 19.9kW residential or commercial?
19.9kW sits at the boundary. It’s still classified as residential for STC purposes (under 100kW) but requires 3-phase and triggers commercial-style network approval. Vista handles the full Western Power application.
What businesses suit a 19.9kW solar system?
Small offices, cafes, light retail, hairdressers, dental clinics, automotive workshops with daytime power loads. ROI is typically 4-6 years with 80%+ daytime offset.
Why stop at 19.9kW instead of 20kW?
19.9kW keeps the system within simpler residential STC zones in some cases and just under network export limits in others. The capacity difference is 0.5% — pricing and approval are noticeably easier.