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Learn · Batteries
A guide to home batteries for Western Australian conditions, regulations, and the local electricity market.
Quick answer
Perth's economics are set by one retailer, so the answer is unusually specific: size the battery to your evening usage rather than your daily total, because evening usage is what stored solar actually displaces — the alternative is importing it while the day's surplus was exported for a fraction of the price. The WA Battery Scheme pays $130/kWh on up to 10 kWh — a maximum of $1,300 for Synergy customers — and requires Battery Rewards VPP enrolment. The interest-free loan is means-tested on household income.
Sources: WA Battery Scheme · Synergy Battery Rewards
Perth sits on the SWIS with a single electricity retailer, so a battery's value is set by one tariff sheet and one export scheme rather than by a market. Three things follow from that.
Synergy's DEBS program rewards exports during peak demand periods, so a battery that charges from midday surplus and discharges into that window earns more than the same battery would elsewhere.
Rates vary by tariff plan. Check your Synergy account for current rates.
Synergy customers in metro Perth get a rebate per kilowatt-hour of eligible capacity, plus access to an interest-free loan. Both are conditional.
Combined with federal STCs, total rebates come to about $4,000–$4,800 for a 10–13 kWh battery on a Synergy household installation.
High summer temperatures (35-40°C+) sit alongside an excellent solar resource year-round, so the battery cycles hard in the conditions that derate it most. Mounting location matters as much as the datasheet: a hot battery environment, dust and ventilation requirements all bear on where it can go. Choose batteries rated for Australian conditions.
VPP participation helps stabilise the grid during peak demand periods, and enrolment is what unlocks the state rebate.
Your inverter capacity determines how quickly your battery can charge and discharge. In WA, residential systems typically use single-phase 5kW to 15kW inverters (most Perth homes), or up to 30kW three-phase on larger properties. Ensure your inverter's continuous power rating matches or exceeds your battery's maximum charge/discharge rate for optimal performance.
Battery sizing in WA depends on your DEBS peak usage pattern — what the household draws between 3pm and 9pm, not what it uses across the day.
| Household | 3pm-9pm usage | Battery |
|---|---|---|
| Small (1-2 people) | 5-10kWh | 8-10kWh |
| Medium (3-4 people) | 10-15kWh | 13-15kWh |
| Large (4+ people) | 15-25kWh | 20-26kWh |
| Very large (pool, A/C, EV charging) | not stated | 30kWh+ |
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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.
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