Backup Power Systems — Southern Perth
Power outages in WA are more common than most people realise — and for homes with medical equipment, young children, security systems, or home offices, losing power is more than an inconvenience. A properly designed backup power system keeps your critical circuits running when the grid goes down. Sparky Local designs and installs battery-based backup systems sized for your needs — from critical circuit backup to whole-home cover.
What we handle:
- Battery backup system design and installation
- Critical circuit sub-panel configuration
- Whole-home backup with automatic switchover
- Tesla Powerwall, GoodWe ESA, and Sigenergy backup-capable systems
- Blackout auto-detection and islanding configuration
- Medical equipment and refrigeration circuit prioritisation
- Generator interlock and transfer switch installation
- Switchboard upgrade to support backup system requirements
Get a Free Quote
As soon as possible
How it works
- 1
Backup load assessment
We start by identifying what you need to keep running during a blackout: refrigeration, lighting, Wi-Fi, phone charging, medical devices, air conditioning? The answer determines what battery capacity you need and how the backup circuits are configured.
- 2
System selection and design
We recommend a battery system with proven backup capability for WA conditions. Not all batteries support backup — some are grid-tied only and shut off during a blackout by design. We select systems that can genuinely island your home.
- 3
Critical load sub-panel installation
For partial-home backup, a dedicated sub-panel is installed to group the circuits you need during an outage. This is more cost-effective than whole-home backup and lets you choose a smaller battery capacity.
- 4
Battery installation and backup commissioning
The battery and its gateway are installed and configured for automatic backup. We test the switchover by simulating a grid failure — confirming your backup circuits come online within seconds of a blackout.
Common questions
What's the difference between a solar battery and a backup battery?
Most solar batteries can store energy — but not all of them can supply that energy during a blackout. Grid-tied batteries are designed to reduce bills, not provide backup. Backup-capable batteries (like Tesla Powerwall, GoodWe ESA, Sigenergy) have additional hardware that allows them to disconnect from the grid and power your home independently during an outage.
How long will a backup battery last during a blackout?
It depends on your battery capacity and your load. A 10kWh battery powering lights, fridge, Wi-Fi, and phone charging (roughly 0.5–1kWh/hour) can last 10–20 hours. Running air conditioning or an electric oven significantly reduces this. We help you calculate your real backup duration during the assessment.
Can I add backup capability to an existing battery system?
Sometimes — it depends on your battery brand and inverter model. Some systems can be retrofitted with a backup gateway. Others are grid-tied only by design and can't support backup without replacing core components. We assess your existing system and advise what's possible before recommending any work.
How much does a backup power system cost in Perth?
Entry-level critical circuit backup systems (covering fridge, lights, Wi-Fi) start from around $8,000–$10,000 installed with a 5–10kWh battery. Whole-home backup capable of running air conditioning or larger loads is typically $12,000–$20,000+. Cost depends on battery capacity, brand, and switchboard work required.
Do I need solar panels for a backup battery to work?
No — a battery can be charged from the grid and discharged for backup use without any solar. However, if your backup runs longer than your battery lasts, solar gives you the ability to recharge during the day even while the grid is still down.
Why Sparky Local?
We understand the difference between a battery that stores solar and a battery that actually keeps your home running during a blackout. We test every backup system before we leave — simulating a grid failure to confirm your circuits switch over correctly. Fully licensed, lifetime workmanship guarantee.
Where we operate
Sparky Local is based in Rockingham and services the Southern Perth and Peel corridors. No call-out fee on local jobs.
Ready to get started?
Upfront pricing. No call-out fee on local jobs. Lifetime workmanship guarantee.