Rainwater Harvesting Tanks, Bore Filtration & Greywater in Perth

For a typical family home (3 kWp solar + LiFePO4 battery) in Perth (Western Australia), combined upfront STCs and state rebates under Federal STC Solar Rebate + Cheaper Home Batteries Program + State VPP Battery Incentives (NSW PDRS, Solar Victoria, QLD & WA) are estimated at A$1,947 (44%), reducing net outlay from A$4,425 to A$2,478.

With a local solar yield of 1780 kWh/kWp/year (+9.9% vs the Australian average of 1620 kWh/kWp), a 3 kWp system in Perth produces ~5.340 kWh/year and prevents 3.471 kg of CO₂ emissions.

In Perth (CEC Zone 3 (Perth Sunniest Capital)), AS/NZS 4777.2 inverter connection, dynamic export limits, and VPP battery registration are managed by Western Power / Synergy (SWIS VPP).

By storing midday solar in a LiFePO4 battery to avoid 45c+/kWh evening peak tariffs and earning AEMO VPP credits, households in Perth save ~A$795/year with a payback of ~3.1 years.