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Beginner's guide
From “what even is a home battery?” to getting quotes from real installers. Six steps, no assumptions about what you already know.
About 20 minutesA home battery is like a large rechargeable power bank for your house. It stores electricity so you can use it later — usually at night when your solar panels aren't generating.
How it works
Common questions
Batteries aren't right for everyone. Here's an honest look at who benefits most.
A battery makes sense if you...
You might want to wait if...
Perth gets more sunshine than almost any other Australian city, making batteries particularly effective here. With Synergy's time-of-use rates, you can store cheap daytime solar and use it during expensive evening peak times (3-9pm), maximizing your savings.
Let's break down the real numbers for Perth homeowners in 2026.
For a standard 10-13.5 kWh battery system, fully installed
Annual savings
Mostly from self-consumption — using stored solar instead of buying at 32¢/kWh. VPP earnings add roughly $100-150/year.
Payback period
Based on tracked Perth installations with properly-sized systems. After payback, savings continue for the battery's lifetime.
Interest-free loan option
If the upfront cost is a barrier, eligible WA households (income under $210,000) can access an interest-free loan of up to $10,000 for battery systems on Synergy's approved list. This spreads the cost over several years with no interest charges.
WA has some of the best battery incentives in Australia. Here's what's available in plain English.
Timing: Federal STCs reduce on May 1, 2026 — larger batteries (14kWh+) see bigger reductions. For typical 10-13kWh systems, the difference is modest. Don't rush based on rebate timing alone.
With dozens of brands available, here's what actually matters when choosing.
Measured in kWh. Most Perth homes need 10-13.5 kWh to cover evening usage. Smaller households might be fine with 5-8 kWh.
Rule of thumb: your daily usage × 0.5 = starting battery size
Choose brands with 5+ years in the Australian market. Many cheap brands enter during rebate periods and disappear within a few years, leaving customers without warranty support.
Established: Tesla, BYD, LG, Alpha ESS, Sungrow, Enphase
10-year minimum. Check what's covered: most warranties guarantee the battery will retain 70-80% capacity after 10 years.
Watch out for warranties under 7 years or handled by importers (not manufacturers)
From May 2026, the WA rebate requires your system to be on Synergy's Supported Solutions List with CSIP-AUS compliance. This is how WA manages its high solar penetration — your battery helps stabilise the grid during peak demand.
Our battery listings show which systems are SSL-approved
Be cautious of batteries priced significantly below market rates. Ultra-cheap systems often come from new manufacturers with no Australian track record.
History lesson: During the 2008-2012 solar panel boom, 73% of new brands exited the Australian market within 5 years, leaving customers with worthless warranties. The same pattern is emerging with batteries.
Ready to move forward? Pick whichever feels right for where you're at.
kWh, DEBS, VPP, STC, LFP... the battery industry loves acronyms. Our glossary explains every term in plain English.
View Glossary