sonnen sells two home batteries in Australia: the sonnenBatterie 12, with a built-in hybrid inverter and 9.4 to 28.2 kWh usable, and the AC-coupled sonnenBatterie Evo with 10 kWh usable. Both carry a 10-year or 10,000-cycle warranty.
sonnenBatterie 12 and Evo: specs and warranty
| Spec | Value | Source |
|---|---|---|
| Category | Home battery | n/a |
| Headquarters | Germany | n/a |
| Models sold in Australia | sonnenBatterie 12 (hybrid) and sonnenBatterie Evo (AC-coupled) | sonnen Australia |
| sonnenBatterie 12 capacity | 9.4, 18.8 or 28.2 kWh usable (1 to 3 modules) | sonnen Australia, sonnenBatterie 12 page |
| sonnenBatterie 12 inverter | Built-in hybrid inverter, single phase | sonnen Australia, sonnenBatterie 12 page |
| sonnenBatterie Evo | 10 kWh usable, AC-coupled, 5 kW continuous backup | sonnen Australia, sonnenBatterie Evo page |
| Warranty | 10 years or 10,000 cycles, whichever comes first | sonnen Australia, sonnenBatterie 12 page |
| sonnenFlat plan | No longer offered; reported ended June 2024 | SolarQuotes, sonnenFlat review (updated 2 Feb 2025) |
How much does the sonnenBatterie Evo cost in 2026?
| Installed price, before rebates (gross) | $14,076-$15,876 |
| Federal Cheaper Home Batteries rebate now | −$2,696 (68 STCs on 10 kWh usable, CER) |
| After the federal rebate (net) | $11,380-$13,180 |
Price source: solarcalculator.com.au, solar battery prices (incl. installation, GST and the federal rebate). Add a compatible hybrid inverter if your system isn't battery-ready. The battery factor steps down to 5.7 STCs per kWh on 1 January 2027, which cuts the rebate on this battery by about $436. NSW and WA households may stack a state incentive on top: see the battery rebate by state.
Federal rebate by sonnenBatterie 12 and Evo size
| Configuration | Usable kWh | STCs | Rebate now | From 1 January 2027 |
|---|---|---|---|---|
| sonnenBatterie 12, 1 module | 9.4 | 63 | $2,498 | $2,101 |
| sonnenBatterie 12, 2 modules | 18.8 | 114 | $4,520 | $3,806 |
| sonnenBatterie 12, 3 modules | 28.2 | 152 | $6,027 | $5,036 |
| sonnenBatterie Evo | 10 | 68 | $2,696 | $2,260 |
Capacities from sonnen Australia, sonnenBatterie 12 page and sonnen Australia, sonnenBatterie Evo page. The rebate pays 6.8 STCs per usable kWh on the first 14 kWh, 60% of that from 14 to 28 kWh and 15% from 28 to 50 kWh (Clean Energy Regulator, Solar batteries), valued here at a $39.65 STC price. These are rebate amounts only, not installed prices.
Key features
- sonnenBatterie 12 has a built-in single-phase hybrid inverter, so panels connect directly
- sonnenBatterie 12 expands from 9.4 to 28.2 kWh usable in 9.4 kWh modules
- Warranty of 10 years or 10,000 cycles on both models
Things to check before you buy
- The warranty ends at 10,000 cycles if you reach them before 10 years, and the sonnenBatterie 12 datasheet adds a throughput limit
- The sonnenBatterie Evo is AC-coupled: it doesn't take solar panels directly
- The sonnenFlat plan is no longer offered, so don't count on it in any savings estimate
Who it suits
Homes wanting a hybrid battery that can grow to 28.2 kWh (sonnenBatterie 12), or an AC-coupled 10 kWh battery for an existing solar system (Evo).
Other battery brands we cover
| Battery | Usable capacity | Installed price (sourced) | Warranty |
|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh per Powerwall 3 | $16,702-$17,251 (13.5 kWh) | 10 years |
| BYD Battery-Box Premium HVS and HVM | 5.1 to 12.8 kWh usable, 2 to 5 modules of 2.56 kWh | $14,009-$16,009 (13.8 kWh) | 10 years (conditions apply) |
| Fox ESS EQ4800 | 9.32 to 41.93 kWh (2 to 9 modules in series) | $9,500-$11,000 (10 kWh) | 10 years |
| Alpha ESS SMILE5 | SMILE-BAT-13.3P: 13.34 kWh usable, 100% depth of discharge, LFP | $12,817-$14,817 (13.3 kWh) | 5-year product, 10-year performance (battery) |
| Sigenergy SigenStor | SigenStor BAT 5.0, 6.0, 8.0 and 10.0, warranted at 5.2, 6.0, 7.8 and 9.0 kWh usable | $15,973-$17,973 (15.6 kWh) | 10 years (15 with a paid extension) |
| Enphase IQ Battery 5P | 5.0 kWh per unit | No sourced price yet | 15 years / 6,000 cycles |
Ranked lists with stated criteria are on best home batteries, and every price band we can source is on the battery price guide.
Common questions about sonnen
How much does the sonnenBatterie 12 and Evo cost in 2026?
$14,076-$15,876 fully installed before the federal rebate (solarcalculator.com.au, solar battery prices (incl. installation, GST and the federal rebate), checked 8 June 2026). The rebate on its 10 kWh usable is about $2,696 today, so roughly $11,380-$13,180 after it, before any state incentive.
How much is the battery rebate on the sonnenBatterie 12 and Evo?
About $2,696 for 10 kWh usable: 68 STCs (6.8 per kWh on the first 14 kWh) at a $39.65 STC price. From 1 January 2027 the factor drops to 5.7, which cuts it by about $436. Your installer applies it at point of sale.
What warranty does sonnen give?
10 years or 10,000 cycles (sonnen Australia, sonnenBatterie 12 page, checked 10 October 2026). Read the warranty document for the exact model you're quoted: conditions such as registration, cycles or capacity retention vary.
Is sonnenFlat still available?
No. sonnen's Australian site no longer offers it, and SolarQuotes reported in an update dated 2 February 2025 that sonnenFlat ended in June 2024.
Where is sonnen based?
sonnen is headquartered in Germany. Ask your installer where the stock they're quoting was made, as manufacturing locations vary by product line.
Want sonnenBatterie 12 and Evo on your roof?
We pass your details to one SAA-accredited installer who can quote sonnen where it's available in your area. The 30-second check confirms your postcode and rebates first, and the installer quotes the exact model for your home.