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Plan your home battery backup system for Perth power outages. Calculate backup duration, prioritise essential loads, and ensure your family stays powered during blackouts.
Quick answer
How long a battery runs your home in an outage is its usable capacity divided by the combined draw of what you keep switched on: the calculator's default 13.5 kWh battery with a 20% reserve leaves 10.8 kWh for your protected circuits. Tick the appliances you would keep running, from fridge to air conditioning, and the calculator converts that into an estimated backup duration.
Sources: Typical appliance power ratings · SBP calculator defaults
Know exactly how long your battery will keep critical appliances running
Prioritise essential loads to maximise backup duration during outages
Accounts for WA grid reliability and local outage patterns
While Perth's electricity grid is generally reliable, power outages can occur due to storms, heatwaves causing network overload, or maintenance work. A battery with backup capability provides security during these events.
Not all batteries offer backup: Many batteries are grid-tied only and will not work during an outage. Look for batteries with "backup" or "off-grid" capability.
Partial vs whole-home backup: Most systems provide backup to a protected loads panel (selected circuits) rather than the entire home. This extends backup duration.
Our Perth battery experts can help you design the perfect backup solution for your home. Get personalised recommendations and accurate quotes.
Recommended: 10-20% to protect battery health