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Rebate Clock

Sigenergy SigenStor rebate

Checked against the approved list

Listed until 5 June 2027. Installs after that need a renewed listing to earn certificates; rule 1.

1 × BAT 5.0, the smallest listed size

Waiting past 31 Dec 2026 costs $240

SigenStor's mixed modules make 13.0 kWh, just under the line, an easy size to hit. Above about 31 kWh each extra module earns 15% of the factor, so buy it for storage rather than the discount.

Try your own numbers

Your battery and install date
Installed by 31 Dec 2026$1,400
Installed from 1 Jan 2027$1,160
Waiting costs you−$240

35 certificates × $40 for 5.2 kWh usable, at the May–Dec 2026 factor of 6.8. 29 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

Compare batteries
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$1,400
  2. Jan–Jun ’27$1,160
  3. Jul–Dec ’27$1,080
  4. Jan–Jun ’28$920
  5. Jul–Dec ’28$840
  6. Jan–Jun ’29$720
  7. Jul–Dec ’29$640
  8. Jan–Jun ’30$520
  9. Jul–Dec ’30$400

How the size taper applies

  • First 14 kWh at 100%5.2 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.

Sigenergy's SigenStor mixes 5 kWh and 8 kWh battery modules under one unit, which is why the approved list carries more than 2,000 SigenStor entries. The modules are listed at 5.2 and 7.8 kWh usable.

SigenStor 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
1 × BAT 5.05.2 kWh$1,400$1,160$1,080$920$840$720$640$520$400
1 × BAT 8.07.8 kWh$2,120$1,760$1,600$1,400$1,240$1,120$960$800$640
2 × BAT 5.010.4 kWh$2,800$2,360$2,160$1,880$1,680$1,480$1,280$1,080$840
BAT 5.0 + BAT 8.013 kWh$3,520$2,960$2,680$2,360$2,120$1,840$1,600$1,320$1,080
2 × BAT 8.015.6 kWh$4,040$3,400$3,080$2,720$2,440$2,120$1,840$1,520$1,240
3 × BAT 8.023.4 kWh$5,320$4,440$4,080$3,600$3,200$2,800$2,400$2,040$1,640
4 × BAT 8.031.2 kWh$6,200$5,200$4,720$4,200$3,720$3,280$2,800$2,360$1,920
5 × BAT 8.039 kWh$6,520$5,480$5,000$4,400$3,920$3,440$2,960$2,480$2,000
6 × BAT 8.046.8 kWh$6,840$5,720$5,240$4,640$4,120$3,600$3,120$2,600$2,080
At $40 a certificate, excluding GST.

What each step up adds in 2026

SizeAddsRebatePer kWh
1 × BAT 8.0 2.6 kWh +$720 $277
2 × BAT 5.0 2.6 kWh +$680 $262
BAT 5.0 + BAT 8.0 2.6 kWh +$720 $277
2 × BAT 8.0 2.6 kWh +$520 $200
3 × BAT 8.0 7.8 kWh +$1,280 $164
4 × BAT 8.0 7.8 kWh +$880 $113
5 × BAT 8.0 7.8 kWh +$320 $41
6 × BAT 8.0 7.8 kWh +$320 $41

SigenStor listings

SizeModel numberNominalUsableListed until
1 × BAT 5.0 SigenStor-5S-5 (AS4777-2 2020) 5.38 kWh 5.2 kWh 5 Jun 2027
1 × BAT 8.0 SigenStor-5S-8 (AS4777-2 2020) 8.06 kWh 7.8 kWh 5 Jun 2027
2 × BAT 5.0 SigenStor-5S-10 (AS4777-2 2020) 10.76 kWh 10.4 kWh 5 Jun 2027
BAT 5.0 + BAT 8.0 SigenStor-5S-13 (AS4777-2 2020) 13.44 kWh 13 kWh 5 Jun 2027
2 × BAT 8.0 SigenStor-5S-16 (AS4777-2 2020) 16.12 kWh 15.6 kWh 5 Jun 2027
3 × BAT 8.0 SigenStor-5S-24 (AS4777-2 2020) 24.18 kWh 23.4 kWh 31 Dec 2027
4 × BAT 8.0 SigenStor-6S-32 (AS4777-2 2020) 32.24 kWh 31.2 kWh 31 Dec 2027
5 × BAT 8.0 SigenStor-6S-40 (AS4777-2 2020) 40.3 kWh 39 kWh 31 Dec 2027
6 × BAT 8.0 SigenStor-6S-48 (AS4777-2 2020) 48.36 kWh 46.8 kWh 31 Dec 2027

How the SigenStor sizes land on the taper

Mixing module sizes lets SigenStor land close to the 14 kWh line: one 5 kWh plus one 8 kWh module gives 13.0 kWh usable, all at the full factor. Two 8 kWh modules give 15.6 kWh, with 1.6 kWh at 60%.

Stacking further, each 8 kWh module adds 7.8 kWh. The third earns 60% on all of it and the fourth on most of it; from the fifth (39.0 kWh), each module earns 15% and adds about a quarter of what the third did.

The one- and two-module combinations shown sit under certificate BAT-522 (listed to 5 June 2027) and the larger stacks under BAT-682 (to 31 December 2027). Sigenergy also lists newer module combinations with other capacities, such as 6.0 kWh usable; enter any of those in the calculator.

Other Sigenergy batteries on the list

Sigenergy has the largest footprint on the approved list by far: more than 2,000 SigenStor entries, plus 50 for the commercial SigenStack. Each SigenStor entry pairs an inverter (3 to 30 kW, single or three phase, some with a built-in EV charger) with a mix of modules, which is why the same capacity appears many times.

Before you sign for a SigenStor

  • Ask which modules make up the stack. Each 5 kWh module is listed at 5.2 kWh usable and each 8 kWh module at 7.8 kWh, so two stacks with the same module count can earn different rebates.
  • Check the SigenStor model number on the quote matches a listed combination for your inverter size; the list has a separate entry for each inverter and module mix.
  • If you are adding modules to a SigenStor that already claimed the discount, the new modules earn nothing.

Rebate calculator · Eligibility rules