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Rebate Clock

SolaX T-BAT HS rebate

Checked against the approved list

T-BAT HS 5, the smallest listed size

Waiting past 31 Dec 2026 costs $200

Judge T-BAT HS quotes on usable capacity, not the size in the name. The HS 15 gets every kilowatt-hour at the full rate, and every size up to the HS 30 stays clear of the 15% band.

Try your own numbers

Your battery and install date
Installed by 31 Dec 2026$1,240
Installed from 1 Jan 2027$1,040
Waiting costs you−$200

31 certificates × $40 for 4.6 kWh usable, at the May–Dec 2026 factor of 6.8. 26 certificates from 1 Jan 2027.

The factor is set by the date on the electrical compliance certificate, not the date you sign the quote.

19 batteries, every install date

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State and price
For state top-ups; the federal rebate is the same everywhere.
Price per certificate

The clock: this battery’s rebate by install date

  1. May–Dec ’26$1,240
  2. Jan–Jun ’27$1,040
  3. Jul–Dec ’27$920
  4. Jan–Jun ’28$840
  5. Jul–Dec ’28$720
  6. Jan–Jun ’29$640
  7. Jul–Dec ’29$560
  8. Jan–Jun ’30$440
  9. Jul–Dec ’30$360

How the size taper applies

  • First 14 kWh at 100%4.6 kWh
  • 14 to 28 kWh at 60%0 kWh
  • 28 to 50 kWh at 15%0 kWh

Get quotes from more than one accredited installer, and ask each to show the STC discount as its own line.

Updated 3 Oct 2026 · every figure links to its source · No provider pays us to be listed.

SolaX's T-BAT HS stacks modules sold as 5.1 kWh, each listed at 4.6 kWh usable, so a T-BAT HS 15 earns the rebate of a 13.8 kWh battery.

T-BAT HS rebate by install date

Size (usable)May–Dec ’26Jan–Jun ’27Jul–Dec ’27Jan–Jun ’28Jul–Dec ’28Jan–Jun ’29Jul–Dec ’29Jan–Jun ’30Jul–Dec ’30
T-BAT HS 54.6 kWh$1,240$1,040$920$840$720$640$560$440$360
T-BAT HS 109.2 kWh$2,480$2,080$1,880$1,680$1,480$1,320$1,120$920$760
T-BAT HS 1513.8 kWh$3,720$3,120$2,840$2,520$2,240$1,960$1,680$1,400$1,120
T-BAT HS 2018.4 kWh$4,520$3,760$3,440$3,040$2,720$2,360$2,040$1,720$1,360
T-BAT HS 2523 kWh$5,240$4,400$4,000$3,560$3,160$2,760$2,400$2,000$1,600
T-BAT HS 3027.6 kWh$6,000$5,040$4,600$4,040$3,600$3,160$2,720$2,280$1,840
At $40 a certificate, excluding GST.

What each step up adds in 2026

SizeAddsRebatePer kWh
T-BAT HS 10 4.6 kWh +$1,240 $270
T-BAT HS 15 4.6 kWh +$1,240 $270
T-BAT HS 20 4.6 kWh +$800 $174
T-BAT HS 25 4.6 kWh +$720 $157
T-BAT HS 30 4.6 kWh +$760 $165

How the T-BAT HS sizes land on the taper

Usable capacity is about 90% of the label on every T-BAT HS size. That works in the HS 15's favour: its 13.8 kWh usable fits entirely in the full-factor band, where a battery with 15 kWh usable would push 1 kWh into the 60% band.

From the HS 20 up, each added module earns 60% of the factor, and the HS 30's 27.6 kWh stays just under the 28 kWh edge, so no T-BAT HS size reaches the 15% band.

This page covers the HS50E-series listing (BAT-538, to 12 September 2027). The older T-BAT-SYS-HV-S3.6 system is listed only until 23 October 2026, and the T-BAT H V2 range until 22 October 2026.

Other SolaX batteries on the list

SolaX has six battery families listed. Most record usable at about 90% of the label, as the T-BAT HS does; the TSYS-HS51 range is the exception, listed at 100% from 10.2 to 66.5 kWh. Two older families, the T-BAT-SYS-HV-S3.6 and the Triple Power T-BAT H, drop off the list in October 2026 unless renewed.

Before you sign for a T-BAT HS

  • Ask for the usable capacity in writing. A T-BAT HS 20 is listed at 18.4 kWh usable, and the certificates follow that figure.
  • Check the quote is for the T-BAT HS (HS50E series) rather than the older T-BAT-SYS-HV-S3.6, whose listing ends on 23 October 2026.

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