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Perth · Southern Suburbs · 6173
What a Secret Harbour home should expect from a solar-and-battery setup — typical sizing for 20-28 kWh daily usage, the WA rebates to claim, and how to get matched with an installer from our network that covers Secret Harbour.
Independent — we compare installers, we don't sell systems.
Clean Energy Regulator, postcode 6173, data to August 2026. The battery series starts July 2025. Method and licence with the adoption detail below. Sun hours and yield are Perth-wide averages, not a reading for this suburb or a forecast for any one roof.
Drag the timeline and the sliders to see how a system would behave on a typical Secret Harbour day. Weather and grid status update live when the APIs are reachable.
Household Type
Based on 6.6 kW solar × 5 sun hours × Perth derate, with a 10 kWh battery offsetting peak-rate Synergy A1 usage and exporting the surplus at DEBS peak/off-peak rates. Real savings depend on your specific tariff plan, usage pattern, and installation — an installer confirms the final quote.
Grid: no planned outages for Secret Harbour (6173).
A representative Secret Harbour household uses about 20-28 kWh a day. On a typical 6.6 kW system, a Perth roof makes around 10,238 kWh a year — so here is what a 10 kWh battery does with that, run through the same calculator as our savings tool, on Secret Harbour’s own usage.
Modelled on Synergy A1 at about 33c/kWh with DEBS peak/off-peak export, using Secret Harbour’s own usage and Perth’s average solar yield. A 6.6 kW array on a 5 kW inverter stays inside WA’s 5 kW DEBS export cap, so exports still earn — most of the saving is self-consumption, not export. Real numbers depend on your tariff plan, usage pattern and install — an installer confirms the quote.
Sized to cover the busy end of Secret Harbour’s evening and overnight load — bigger than the blanket range these pages used to show. The WA Battery Scheme rebate is paid on the first 10 kWh; a larger battery still installs, just past the subsidised capacity.
Secret Harbour sits on the wider South West Interconnected System rather than the dense metro grid, on longer coastal feeders — outages tend to last longer out here, which is often the deciding factor for storage.
Western Power is the distributor — separate from Synergy, who bills you. Since 1 May 2026 new systems fall into export tiers by how they connect and are monitored; a good installer handles the paperwork.
Secret Harbour's case is as much resilience as savings. Larger newer homes carry a real evening load a battery can cover, and the longer feeder runs mean a critical-circuit backup earns its place through storm season. The trade-off is coastal siting for the hardware; a small daytime-only household still gets most of the value from solar on its own.
Tell us about your place and we’ll match you with an installer from our network that covers Secret Harbour — you choose whether to act on it. We’re the matchmaker, not the retailer.
The ABS counts dwellings by suburb rather than by postcode, so that total is apportioned across postcode boundaries and is approximate. Every certificate created for a new, upgraded or replaced system since 2001 counts towards the ratio above, so it is not the share of homes with solar. Where building has continued since the Census, the figure can pass 100.
Based on Clean Energy Regulator data for postcode 6173. WA has the highest per-capita rooftop solar adoption rate in Australia.
Data to August 2026. Licensed from the Clean Energy Regulator, Commonwealth of Australia under a Creative Commons Attribution 4.0 licence. Systems per 100 dwellings is derived. Based on Clean Energy Regulator material, Commonwealth of Australia, under a Creative Commons Attribution 4.0 licence. Based on Australian Bureau of Statistics data, 2021 Census, used under CC BY 4.0.
Outer suburbs on the SWIS fringe experience higher outage frequency and longer restoration times due to distance from depots. Backup battery capability is strongly recommended.
Common outage causes: storm damage, equipment age, tree contact, lightning. Network infrastructure: Predominantly overhead network. Longer feeder runs mean longer restoration times.
Backup battery sizing for Secret Harbour: with an average outage duration of 73 minutes (1.2 hours), a 5 kWh backup-capable battery is typically sufficient to maintain essential loads (lights, fridge, internet, medical equipment). For whole-home backup during longer outages, consider 10–13.5 kWh with backup capability.
Tell us your roof and usage and we'll match you with an installer from our network that covers Secret Harbour. You choose whether to act on it. No obligation.
AS/NZS 5139 clearance rules, garage vs outdoor walls, and what installers check on-site.
A step-by-step method covering evening usage and seasonal AC demand.
Activation events credit 70¢/kWh on top of DEBS exports, and signing up is a WA rebate condition.