2026 Battery Buying Checklist: 12 Things to Verify Before You Sign
The WA battery market in 2026 involves new compliance requirements, changing rebate structures, and a crowded field of products. This checklist covers the essential verification steps before committing to a purchase.
Battery prices are at historic lows and rebates remain available, making 2026 an attractive time to buy. But the market has also become more complex. New Synergy compliance rules, the May 2026 STC capacity taper, and a growing list of manufacturers mean there are more things to get right — and more ways to get caught out.
This checklist distils the key verification steps into a practical sequence. Work through these before signing any contract.
The 12-Point Checklist
1. Verify the Battery Is on the CEC Approved List
The Clean Energy Council maintains a register of approved battery products. Only CEC-approved batteries qualify for federal STC rebates and the WA Battery Scheme. Ask your installer to confirm the exact model (not just the brand) is currently listed. Models are occasionally delisted or expire without renewal.
2. Check Synergy SSL Compliance (Tier 2)
From May 2026, new battery installations must use equipment on Synergy's Supported Solutions List (SSL) to access Tier 2 benefits including the WA Battery Scheme rebate, Battery Rewards VPP payments, and dynamic export limits. Ask your installer which SSL pathway your system uses: integrated inverter, cloud platform, or gateway device. If a gateway is required, confirm its cost is included in the quote.
3. Confirm the Installer Is CEC-Accredited with Battery Endorsement
Standard electrical licensing is not sufficient for battery installation. The installer must hold current CEC accreditation with a specific battery endorsement. This is a legal requirement in WA and a condition for claiming rebates. You can verify accreditation on the CEC's public register.
4. Read the Warranty Terms — Especially Degradation Guarantees
A “10-year warranty” can mean very different things. The critical number is the end-of-warranty capacity guarantee. A battery warranted to 70% capacity at 10 years will deliver noticeably less energy in years 7-10 than one warranted to 80%. Also check: is the warranty void if you move house? Does it require annual inspections? Is it backed by the manufacturer or the installer?
5. Verify the Quote Includes All Costs
A competitive battery quote should include: the battery unit, hybrid or AC-coupled inverter (if applicable), installation labour, switchboard upgrade (if required), backup transfer switch (if backup is specified), Western Power notification, and commissioning. Ask specifically whether a Synergy SSL gateway device is an additional cost. Hidden extras of $1,000-$2,000 after signing are a common complaint.
6. Confirm Rebate Handling
Your installer should handle both the federal STC claim and the WA Battery Scheme application on your behalf. Confirm in writing: (a) the quoted price is the after-rebate price, or (b) the rebate will be applied as a discount at settlement. Also confirm who applies for the WA rebate and when — some installers require you to apply directly through Synergy.
7. Check the Installation Timeline Against STC Deadlines
STCs are calculated at the date of installation, not the date of purchase. If your battery capacity exceeds 14 kWh, the May 2026 capacity taper will significantly reduce your STC entitlement. For a 20 kWh battery, the difference between installing in April versus May 2026 could be $3,000 or more. Confirm the installer can complete before any upcoming deadline.
8. Match Battery Size to Your Actual Evening Load
The most common sizing mistake is buying too large. A typical Perth household uses 8-12 kWh between 5 pm and 7 am. If your evening load is 9 kWh, a 10 kWh battery covers it — a 20 kWh battery means paying for capacity you rarely use. Ask the installer how they calculated the recommended size. If they can't explain it clearly, get a second quote.
9. Choose LFP Chemistry Unless You Have a Specific Reason Not To
Lithium Iron Phosphate (LFP) batteries are now the default choice for Perth installations. They tolerate heat better than NMC chemistry, last longer (typically 6,000-10,000 cycles versus 4,000-6,000), and have a better thermal safety profile. NMC batteries may offer slightly higher energy density (smaller physical size), but for most Perth homes, LFP is the better fit.
10. Confirm Backup Capability and Switchover Time
Not all batteries provide blackout backup, and those that do vary in switchover speed. If backup is important to you, confirm: (a) the system supports backup, (b) which circuits will be backed up, (c) the switchover time (instantaneous or 5-10 seconds), and (d) whether the solar array can recharge the battery during a grid outage. Some cheaper systems disconnect solar during blackouts, limiting backup duration.
11. Check the Manufacturer's Australian Presence
A battery is a 10-15 year investment. If the manufacturer exits the Australian market, warranty claims become difficult or impossible. Check whether the manufacturer has an Australian office, local warranty service, and a track record of supporting products long-term. Our manufacturer profiles include market data and local presence information for every major brand.
12. Get at Least Three Quotes
Battery pricing in Perth varies by 20-40% for the same product depending on the installer. Three quotes from CEC-accredited installers give you a reliable baseline. Be wary of quotes significantly below the market range — the discount often comes from cutting corners on switchboard work, backup wiring, or commissioning quality.
Common Red Flags
- The installer cannot confirm CEC accreditation or battery endorsement when asked
- The quote does not itemise the battery, inverter, and installation separately
- The system is not on the Synergy SSL and no gateway solution is quoted
- Pressure to sign immediately (“this price expires today”)
- Savings projections that assume 100% self-consumption or ignore degradation
- No mention of Western Power notification or compliance certificates
Use Our Tools to Prepare
Research products, check manufacturer market data, and calculate your savings before requesting quotes.
Sources: Clean Energy Council, Synergy Supported Solutions List, Clean Energy Regulator. Data current as of March 2026.
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