Sigenergy Battery Prices in Australia 2026: Every Size, After the Rebate

A Sigenergy SigenStor costs roughly $14,000 to $17,000 installed for a common 16kWh single-phase system before rebates, or about $10,500 to $13,500 after the federal battery rebate. Across the range, once you get past the smallest size, expect around $770 to $800 per usable kWh installed after the rebate. Sigenergy does not publish fixed prices, so every quote varies with your site, phase and whether you are retrofitting existing solar.

This page breaks down what each SigenStor size costs, what makes up the price, and what pushes your own quote up or down. For the full product verdict, see our Sigenergy SigenStor review.

Sigenergy SigenStor price by size (2026)

The SigenStor is modular: you stack 5kWh and 8kWh battery blocks on a single energy controller. The figures below are indicative installed prices built from installer-network averages (around $1,000 per usable kWh installed for a single-phase system) and the current rebate rate. They are a starting point, not a quote.

Usable capacity	Installed (before rebate)	Federal rebate	After rebate	After-rebate $/kWh
8 kWh (entry)	$9,000–$11,000	~$2,000	~$7,500–$9,500	~$1,060
16 kWh (SP / TP)	$14,000–$17,000	~$3,800	~$10,500–$13,500	~$750
24 kWh	$21,000–$25,000	~$5,000	~$16,500–$20,500	~$770
32 kWh	$28,000–$33,000	~$5,750	~$22,500–$27,500	~$780
40 kWh	$34,000–$40,000	~$6,050	~$28,500–$34,500	~$790
48 kWh (max per tower)	$40,000–$47,000	~$6,350	~$34,500–$41,500	~$800

Two things stand out. The 8kWh entry system is the dearest per kWh, because the fixed cost of the energy controller and gateway is spread over less storage. And the rebate stops growing much past 28kWh, because the federal rate tapers above the first 14kWh of usable capacity (more on that below). For most homes, a 16 to 24kWh SigenStor is the value sweet spot.

What makes up a Sigenergy price

Honest quotes itemise the parts. A SigenStor system is the energy controller (the hybrid inverter), the battery modules, an optional backup gateway, and installation. Indicative supply-only prices:

Component	Indicative price (supply)
Energy controller (single-phase, 5–10kW)	$4,000–$4,500
8 kWh battery module	~$2,950 each
5 kWh battery module	~$2,100 each
Backup gateway (optional)	$890–$1,990
25kW bidirectional DC EV charger (optional)	~$6,000
Installation (labour, electrical)	$1,500–$3,500

A practical tip: the 8kWh modules are better value per kWh than the 5kWh modules, both at wholesale and because they earn more rebate for the same tower footprint. If your target capacity can be reached with 8kWh blocks, it usually should be.

What changes your Sigenergy price

• Single-phase vs three-phase. The three-phase SigenStor TP controller costs roughly $2,000 to $3,000 more than the single-phase SP for the same battery capacity. Only the recall on some single-phase controllers, covered in the review, applies to SP units; the TP is unaffected.
• Retrofit vs new solar. Adding a SigenStor to existing solar (AC-coupled) is usually cheaper on hardware but can need extra electrical work. A new solar-plus-battery build (DC-coupled) is more efficient but a larger project.
• Backup gateway. Skip it and you save $890 to $1,990, but you lose blackout backup. Keep it if riding through outages matters.
• Location and network. Labour rates and the rules of your distributor (for example export limits) shift both price and what the system is allowed to do.
• The EV charger module. The optional 25kW DC charger adds about $6,000 but turns the battery into a fast home charger with vehicle-to-home capability.

The federal rebate on a Sigenergy

The federal Cheaper Home Batteries Program discounts the installed price at the point of sale. As of 2026 it is worth about $250 per usable kWh on the first 14kWh of capacity, tapering above that (roughly $150/kWh from 14 to 28kWh, and $38/kWh from 28 to 50kWh), after the rate stepped down on 1 May 2026. On a 16kWh SigenStor that is about $3,800 off; on a 24kWh system, about $5,000. You can check what your state stacks on top with our rebate checker.

How Sigenergy compares on price

On post-rebate cost per usable kWh, the SigenStor lands mid-pack: cheaper than a Tesla Powerwall 3 or a Sungrow SBR160 per kWh, dearer than value picks like the GoodWe ESA, and far below premium brands like sonnen. What you are paying the middle for is integration, the inverter, battery, backup and optional EV charging in one system, plus the AI energy management. For the full field, see our solar battery cost guide and the best home battery guide.

How to get an accurate Sigenergy quote

Because so much depends on your phase, existing solar and site, the only way to a real number is an itemised quote from an accredited installer. Ask for the energy controller, each battery module, the gateway and installation as separate lines, confirm whether the quote is single-phase or three-phase, and for a single-phase SP unit, confirm the controller has the updated AC connector from the 2025 recall remedy.