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Rebate Clock

Fox ESS EQ4800 rebate

Checked against the approved list

EQ4800-L2, the smallest listed size

Waiting past 31 Dec 2026 costs $400

Three modules collect the full rate on every kilowatt-hour, and modules four to six still add rebate at 60%. Past six, buy modules for storage, not for the discount.

Try your own numbers

Your battery and install date
Installed by 31 Dec 2026$2,520
Installed from 1 Jan 2027$2,120
Waiting costs you−$400

63 certificates × $40 for 9.32 kWh usable, at the May–Dec 2026 factor of 6.8. 53 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$2,520
  2. Jan–Jun ’27$2,120
  3. Jul–Dec ’27$1,920
  4. Jan–Jun ’28$1,680
  5. Jul–Dec ’28$1,520
  6. Jan–Jun ’29$1,320
  7. Jul–Dec ’29$1,120
  8. Jan–Jun ’30$960
  9. Jul–Dec ’30$760

How the size taper applies

  • First 14 kWh at 100%9.32 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.

Fox ESS's EQ4800 stacks 4.66 kWh modules from two (9.32 kWh) to nine (41.93 kWh). The three-module stack, at 13.98 kWh, lands 0.02 kWh under the 14 kWh line.

EQ4800 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
EQ4800-L29.32 kWh$2,520$2,120$1,920$1,680$1,520$1,320$1,120$960$760
EQ4800-L313.98 kWh$3,800$3,160$2,880$2,560$2,280$2,000$1,720$1,440$1,160
EQ4800-L418.64 kWh$4,560$3,800$3,480$3,080$2,720$2,400$2,080$1,720$1,400
EQ4800-L523.3 kWh$5,320$4,440$4,040$3,600$3,200$2,800$2,400$2,000$1,640
EQ4800-L627.96 kWh$6,080$5,080$4,640$4,080$3,640$3,200$2,760$2,320$1,840
EQ4800-L732.61 kWh$6,280$5,240$4,800$4,240$3,760$3,320$2,840$2,400$1,920
EQ4800-L837.27 kWh$6,440$5,400$4,920$4,360$3,880$3,400$2,920$2,440$1,960
EQ4800-L941.93 kWh$6,640$5,560$5,080$4,480$4,000$3,520$3,000$2,520$2,040
At $40 a certificate, excluding GST.

What each step up adds in 2026

SizeAddsRebatePer kWh
EQ4800-L3 4.66 kWh +$1,280 $275
EQ4800-L4 4.66 kWh +$760 $163
EQ4800-L5 4.66 kWh +$760 $163
EQ4800-L6 4.66 kWh +$760 $163
EQ4800-L7 4.65 kWh +$200 $43
EQ4800-L8 4.66 kWh +$160 $34
EQ4800-L9 4.66 kWh +$200 $43

How the EQ4800 sizes land on the taper

Three EQ4800 modules make 13.98 kWh, two-hundredths of a kilowatt-hour under 14. No stacked battery on this site gets closer to the line, so the EQ4800-L3 earns the full factor on every bit of its capacity.

Modules four, five and six each add 4.66 kWh in the 60% band. The seventh crosses 28 kWh, and from there each module adds 4.66 kWh at 15%, about a quarter of what modules four to six added.

In rebate per kilowatt-hour, the L2 and L3 stacks are level; by the L9 the figure has fallen to about 58% of theirs, because two-thirds of a nine-module stack sits in the reduced bands.

The EQ4800's listing, BAT-564, runs to 14 November 2027.

Other Fox ESS batteries on the list

Fox ESS has nine battery families on the list. Two look alike on a quote: the EQ4800 on this page, listed at 100% usable, and the ECS4800, whose stacks are listed at 90% usable (8.39 kWh for two modules). The newer EQ5500, with 5.46 kWh modules up to 49.14 kWh, and the CQ6 and CQ7 ranges run to the end of 2027.

Before you sign for a EQ4800

  • Check the quote says EQ4800 and the number of modules (L2 to L9). Fox ESS also lists the ECS4800, whose modules have about 10% less usable capacity than the same EQ4800 stack.
  • If you are deciding between three and four modules, note that three stays under 14 kWh and the fourth earns 60% of the full rate.

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