Sigenergy vs SolaX home batteries, matched by size
We install both brands at six matching sizes. SolaX costs less at all six, by $503 to $1,554 without backup. Partial backup adds $500 on SolaX and $1,456 to $1,681 on Sigenergy, which includes a Sigen Gateway.
We only list systems we supply and install, priced from our written quotes. Valid until 19 November 2026.
The short answer
- SolaX costs less at all six matched sizes, by $503 to $1,554 without backup.
- Partial backup adds $500 on SolaX, and $1,456 (single-phase) or $1,681 (three-phase) on Sigenergy, which includes a Sigen Gateway. With partial backup, SolaX costs $1,644 to $2,510 less.
- Both carry a 10-year battery warranty.
- Sigenergy systems take solar panels up to 12 to 48 kW and SolaX up to 10 to 30 kW, depending on the inverter.
Matching sizes
Each row pairs systems built for the same supply, with usable energy within 10% and the same inverter output.
| Usable energy | Inverter | Sigenergy | SolaX | Difference | With partial backup | Compare |
|---|---|---|---|---|---|---|
| Single-phase homes | ||||||
| 18 and 18.4 kWh | 10 kW | $9,887Quote | $8,333Quote | SolaX $1,554 less | SolaX $2,510 less | |
| 27 and 27.5 kWh | 10 kW | $11,722Quote | $11,033Quote | SolaX $689 less | SolaX $1,644 less | |
| 36 and 36.7 kWh | 10 kW | $14,509Quote | $13,459Quote | SolaX $1,050 less | SolaX $2,005 less | |
| Three-phase homes | ||||||
| 27 and 27.5 kWh | 10 kW | $11,845QuoteAlso with a 15 kW inverter: $12,749 | $10,699Quote | SolaX $1,146 less | SolaX $2,327 less | |
| 36 and 36.7 kWh | 15 kW | $15,519QuoteAlso with a 10 kW inverter: $14,687 | $14,393Quote | SolaX $1,126 less | SolaX $2,308 less | |
| 45 and 45.9 kWh | 15 kW | $18,256QuoteAlso with a 20 kW inverter: $19,378 | $17,753Quote | SolaX $503 less | SolaX $1,684 less | |
Sigenergy 18 kWh usable and SolaX 18.4 kWh usable side by side
Single-phase · 10 kW inverters · Without backup · Figures from the manufacturers' datasheets, prices from our written quotes.
- SolaX 18.4 kWh usable costs $1,554 less installed than Sigenergy 18 kWh usable, without backup.
- Partial backup adds $500 on SolaX and $1,456 on Sigenergy, which includes a Sigen Gateway.
- Sigenergy's batteries supply up to 9.2 kW on their own, less than its 10 kW inverter.
- Sigenergy can go on a wall or the floor; SolaX stands on the floor only.
Same on both: LFP battery cells, 10-year battery and inverter warranties, 70% capacity at the end of the warranty, IP66 batteries and inverters, hybrid inverters.
 |  | |
|---|---|---|
| Price | ||
| No differences in price. | ||
| Installed price, rebate taken off | $9,887 | $8,333Lower |
| Price per usable kWh | $549 | $454Lower |
| Federal battery rebate included | −$4,107 | −$4,144 |
| Price before the rebate | $13,994 | $12,477 |
| Quote valid until | 19 November 2026 | 19 November 2026 |
| Energy and power | ||
| No differences in energy and power. | ||
| Energy you can use | 18 kWh | 18.4 kWhRated 20.4 kWh |
| Rated size, as quoted | 18 kWh | 20.4 kWh |
| Power it can supply at once | 10 kWThe batteries alone supply up to 9.2 kW | 10 kW |
| Battery power on its own | Up to 9.2 kW (below the inverter) | Not limited by the batteries |
| Blackout backup power | 10 kWSwitches over in 0 ms | 10 kWSwitches over in under 10 ms |
| Add more battery later | Up to 6 modulesUp to 54 kWh, any time | Up to 13 modulesUp to 59.7 kWh, within a year of installation |
| Whole-home backup | With Sigen GatewayGateway included in the backup option | Built in |
| Virtual power plants | Amber, GloBird, Powow | GloBird |
| Time to fill from the grid | About 2 hoursAt up to 9.2 kW | About 2 hoursAt up to 10 kW |
| Solar | ||
| No differences in solar. | ||
| Solar panels it can take | 20 kW | 20 kW |
| With your existing solar | Works beside your inverterNew panels can connect to it too | Works beside your inverterNew panels can connect to it too |
| Warranty | ||
| No differences in warranty. | ||
| Battery warranty | 10 years | 10 years |
| Inverter warranty | 10 years | 10 years |
| Capacity at the end of the warranty | 70% | 70% |
| Warranty | 10 yearsKeeps at least 70% of its capacity | 10 yearsKeeps at least 70% of its capacity |
| Installation | ||
| No differences in installation. | ||
| Mounting | Wall or floor | Floor only |
| Heaviest single piece | 78 kg | 47 kgLighter |
| Total weight | 192 kg | 216 kg |
| Weather rating | Battery IP66, inverter IP66 | Battery IP66, inverter IP66 |
| Battery cells | LFP | LFP |
| Where it can go | Wall or floorIP66 · -20 to 55 °C | Floor onlyIP66 · -30 to +53 °C |
| Inverter noise | Not on the Sigenergy datasheet | Under 35 dB |
| Size installed | H 910 × W 850 × D 260 mmInverter on top, heaviest piece 78 kg, 215 kg in total | H 957 × W 600 × D 376 mmInverter on the wall 557 × 590 × 180 mm, heaviest piece 47 kg, 211 kg in total |
| View the quoteBook an InspectionQuoted as Sigenergy 18 kWh single-phase with 10 kW inverter | View the quoteBook an InspectionQuoted as SolaX 20.4 kWh single-phase with 10 kW inverter | |
Next step
18 kWh usable · $9,887
18.4 kWh usable · $8,333
Equipment and datasheets
Sigenergy 18 kWh usable: 2 × SigenStor BAT 10.0 battery modules (9 kWh usable each) and one SigenStor EC 10.0 SP inverter. Figures from the Sigenergy datasheets for these models.
SolaX 18.4 kWh usable: 4 × TB-HS51 battery modules (4.6 kWh usable each) and one X1-VAST-10K inverter. Figures from the SolaX datasheets for these models.
Close, but not like for like
Sigenergy 18 kWh usable with a 6 kW inverter ($8,068) and SolaX 18.4 kWh usable with a 5 kW inverter ($8,020), single-phase.
The inverters differ, so the $48 difference is not like for like.
Other sizes we install (5 Sigenergy, 4 SolaX)
- Sigenergy 45 kWh usable, single-phase, 10 kW inverter · $17,407 · View the quote
- Sigenergy 18 kWh usable, three-phase, 10 kW inverter · $9,983 · View the quote
- Sigenergy 18 kWh usable, three-phase, 15 kW inverter · $11,044 · View the quote
- Sigenergy 54 kWh usable, three-phase, 20 kW inverter · $23,414 · View the quote
- Sigenergy 54 kWh usable, three-phase, 30 kW inverter · $23,651 · View the quote
- SolaX 13.8 kWh usable, single-phase, 5 kW inverter · $7,004 · View the quote
- SolaX 23 kWh usable, single-phase, 5 kW inverter · $9,036 · View the quote
- SolaX 23 kWh usable, single-phase, 10 kW inverter · $9,890 · View the quote
- SolaX 23 kWh usable, three-phase, 15 kW inverter · $10,484 · View the quote
How we compare
Prices come from Sunbridge Energy's written quotes, issued 20 October 2026 and valid until 19 November 2026. Each includes GST, the listed equipment and standard installation and commissioning, with the federal battery rebate (Cheaper Home Batteries Program) deducted at the rate for an installation on the quote date. The rebate is set by the installation date, and eligibility is confirmed before installation. Prices are the same in NSW, VIC and QLD.
These options and site work can add to a price, and each written quote sets them out: garage installation +$500, new concrete slab +$250, cable beyond 5 m +$30 per metre, remove old inverter +$300, remove old battery +$600, remove old inverter and battery +$900 and switchboard upgrade up to $1,500.
Specifications come from the manufacturers' datasheets for each battery module and inverter. Where a datasheet we hold leaves a figure out, we say so rather than estimate it. For 32 of the 62 systems, the inverter datasheet gives no separate limit for power drawn from the battery, so we show the inverter's output and, where it is lower, the batteries' own rating instead of a combined figure. Price per usable kWh and warranty energy are calculated by Sunbridge from these figures.
We only compare systems built for the same supply, and we group sizes by usable energy. Brand comparisons pair systems with usable energy within 10% and the same inverter output, and say so when they can't. A figure counts as different only when the gap is large enough to matter: $100 of price, $10 per usable kWh, 0.5 kWh of usable energy, 0.5 kW of inverter output, 1 kW of solar input, one year of warranty, 5% of warranty energy or 5 kg of weight.
We supply and install every system on this page and earn from each installation, so this is not an independent review. We only list the six brands we install. Brands we don't install, such as Tesla, Sungrow and BYD, are not here.
Questions about Sigenergy and SolaX
Is Sigenergy or SolaX better?
Neither is better for every home. SolaX costs less at all six matched sizes, by $503 to $1,554 without backup. Sigenergy systems take solar panels up to 12 to 48 kW and SolaX up to 10 to 30 kW, depending on the inverter. The inspection confirms which suits your home.
Does backup cost more with Sigenergy?
Partial backup adds $500 on SolaX, and $1,456 (single-phase) or $1,681 (three-phase) on Sigenergy, which includes a Sigen Gateway. With partial backup, SolaX costs $1,644 to $2,510 less. Full house backup adds $800 on SolaX and $1,981 on Sigenergy, on three-phase packages only.
Which has the longer warranty?
Both carry a 10-year battery warranty. Inverter warranties: Sigenergy 10 years, SolaX 10 years.
Can I compare other sizes or brands?
Yes. The size pages compare every system of about 20, 30 or 40 kWh, and the comparison page covers every size and brand we install.
Why are some sizes not compared like for like?
The inverters differ, so the $48 difference is not like for like.
More comparisons
What happens when you book
Choose a time and the inspection goes straight into your local branch's calendar. It takes about 20 minutes. We confirm your supply, where the system goes and whether anything changes the price, before anything is final.
Sunbridge Energy supplies and installs every system here through its Sydney, Melbourne, Brisbane and Gold Coast branches. Sigenergy Certified Installer · New Energy Tech Consumer Code Approved Seller.