Right size
Can your excess solar fill it—and can your evening use empty it? Bigger is not automatically better.
Updated for the May 2026 rebate rules
Is your battery quote actually worth it?
Enter the real numbers from your quote and power bill. Get an independent result instantly, then choose whether to keep the report or request one vetted alternative.
Instant resultEmail only to saveNever shared without permissionSources shown
BATTERY QUOTE$8,200
Usable capacity13.5 kWh
Federal certificates91 est.
Modelled payback8.5 years
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X-RAY RESULTPromising quote
475,531eligible batteries recorded since July 2025
6.82026 STCs per eligible kWh before tapering
10 yearsthe common warranty window your payback must beat
Clean Energy Regulator data ↗Independent calculatorMost calculators sell batteries.
Most calculators sell batteries.
This one interrogates the quote.
A cheap battery can still be a bad buy if your home cannot fill or empty it. A good battery can still be a bad quote if the price or rebate is wrong.
What the X-ray checks
Real payback
We value stored solar against the import rate you avoid and the feed-in tariff you give up.
Federal support
We apply the current 6.8 STC factor and the 14/28/50 kWh taper introduced in May 2026.
Quote pressure points
Installed price per usable kWh, warranty recovery and the assumptions worth challenging.
The uncomfortable truth
A rebate does not make every battery a good investment.
The Australian Government’s own guidance says battery savings may not repay the upfront cost within the battery’s lifetime. The answer depends on when you use power, how much solar you export, the tariff spread and what the installer is charging.
Read the government guidance ↗Solar export12.0 kWhavailable to charge
×
Tariff spread29¢import less feed-in
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Efficiency loss10%energy lost cycling
Not the sales brochure.Your actual economics.
Take these to the installer
Seven questions before you sign.
- 01
Is the capacity on this quote usable capacity or nominal capacity?
- 02
Show me the daily solar-export and evening-demand assumptions behind your payback.
- 03
Exactly how many federal STCs are being assigned, and at what certificate value?
- 04
Will backup power work automatically, and which circuits will remain powered?
- 05
Does the quoted inverter limit how quickly the battery can charge or power the house?
- 06
Is VPP participation optional? Who controls the battery, and how can I leave?
- 07
Are switchboard work, metering, approvals, monitoring and every installation cost included?
Keep researching
Make the decision, not just the calculation.
Quick answers
Home battery quote FAQs.
How do I check whether a home battery quote is worth it?
Compare the installed price after incentives with degraded savings over the warranty. Use your real solar exports, evening electricity use, import tariff and feed-in tariff—not a salesperson’s generic household profile.
What size home battery do I need?
Start with the lower of your average daily solar exports and your evening electricity use adjusted for battery efficiency. Compare usable capacity, not nominal capacity.
Does Battery Quote X-Ray sell my details?
No. Saving your report is separate from marketing permission and from an installer introduction. We only share contact and quote details if you explicitly request one introduction.