GoodWe vs Sigenergy home batteries, matched by size
We install both brands at 12 matching sizes. GoodWe costs less at all 12, by $559 to $3,434 without backup. Partial backup adds $500 on GoodWe 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
- GoodWe costs less at all 12 matched sizes, by $559 to $3,434 without backup.
- Partial backup adds $500 on GoodWe, and $1,456 (single-phase) or $1,681 (three-phase) on Sigenergy, which includes a Sigen Gateway. With partial backup, GoodWe costs $1,740 to $4,616 less.
- Both carry a 10-year battery warranty.
- GoodWe systems take solar panels up to 20 to 60 kW and Sigenergy up to 12 to 48 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 | GoodWe | Sigenergy | Difference | With partial backup | Compare |
|---|---|---|---|---|---|---|
| Single-phase homes | ||||||
| 17.4 and 18 kWh | 10 kW | $7,838Quote | $9,887QuoteAlso with a 6 kW inverter: $8,068 | GoodWe $2,049 less | GoodWe $3,005 less | |
| 26.1 and 27 kWh | 10 kW | $9,433Quote | $11,722Quote | GoodWe $2,289 less | GoodWe $3,244 less | |
| 34.8 and 36 kWh | 10 kW | $11,763Quote | $14,509Quote | GoodWe $2,746 less | GoodWe $3,701 less | |
| 43.5 and 45 kWh | 10 kW | $14,526Quote | $17,407Quote | GoodWe $2,881 less | GoodWe $3,836 less | |
| Three-phase homes | ||||||
| 17.4 and 18 kWh | 10 kW | $7,567Quote | $9,983Quote | GoodWe $2,416 less | GoodWe $3,597 less | |
| 17.4 and 18 kWh | 15 kW | $8,050Quote | $11,044Quote | GoodWe $2,994 less | GoodWe $4,176 less | |
| 26.1 and 27 kWh | 10 kW | $9,581Quote | $11,845Quote | GoodWe $2,264 less | GoodWe $3,445 less | |
| 26.1 and 27 kWh | 15 kW | $9,753Quote | $12,749Quote | GoodWe $2,996 less | GoodWe $4,177 less | |
| 34.8 and 36 kWh | 15 kW | $12,085Quote | $15,519Quote | GoodWe $3,434 less | GoodWe $4,616 less | |
| 40 and 36 kWh | 10 kW | $14,128QuoteAlso with a 15 kW inverter: $14,300 | $14,687Quote | GoodWe $559 less | GoodWe $1,740 less | |
| 48 and 45 kWh | 15 kW | $16,795QuoteAlso with a 10 kW inverter: $17,283Also with a 30 kW inverter: $17,266 | $18,256Quote | GoodWe $1,461 less | GoodWe $2,642 less | |
| 48 and 45 kWh | 20 kW | $16,890Quote | $19,378Quote | GoodWe $2,488 less | GoodWe $3,669 less | |
GoodWe 17.4 kWh usable and Sigenergy 18 kWh usable side by side
Single-phase · 10 kW inverters · Without backup · Figures from the manufacturers' datasheets, prices from our written quotes.
- GoodWe 17.4 kWh usable costs $2,049 less installed than Sigenergy 18 kWh usable, without backup.
- Partial backup adds $500 on GoodWe and $1,456 on Sigenergy, which includes a Sigen Gateway.
- Sigenergy stores 0.6 kWh more usable energy.
Same on both: LFP battery cells, 10-year battery and inverter warranties, 70% capacity at the end of the warranty, IP66 batteries and inverters, wall or floor mounting, hybrid inverters.
 |  | |
|---|---|---|
| Price | ||
| No differences in price. | ||
| Installed price, rebate taken off | $7,838Lower | $9,887 |
| Price per usable kWh | $450Lower | $549 |
| Federal battery rebate included | −$4,033 | −$4,107 |
| Price before the rebate | $11,871 | $13,994 |
| Quote valid until | 19 November 2026 | 19 November 2026 |
| Energy and power | ||
| No differences in energy and power. | ||
| Energy you can use | 17.4 kWhRated 18 kWh | 18 kWhMore |
| Rated size, as quoted | 18 kWh | 18 kWh |
| Power it can supply at once | 10 kWThe batteries alone supply up to 9 kW | 10 kWThe batteries alone supply up to 9.2 kW |
| Battery power on its own | Up to 9 kW (below the inverter) | Up to 9.2 kW (below the inverter) |
| Blackout backup power | 10 kWSwitches over in 4 ms | 10 kWSwitches over in 0 ms |
| Add more battery later | Up to 12 modulesUp to 104.4 kWh, any time | Up to 6 modulesUp to 54 kWh, any time |
| Whole-home backup | Built in | With Sigen GatewayGateway included in the backup option |
| Virtual power plants | Amber, ENGIE | Amber, GloBird, Powow |
| Time to fill from the grid | About 2 hoursAt up to 9 kW | About 2 hoursAt up to 9.2 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 | Wall or floor |
| Heaviest single piece | 77 kg | 78 kg |
| Total weight | 180 kg | 192 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 | Wall or floorIP66 · -20 to 55 °C |
| Inverter noise | 35 dB | Not on the Sigenergy datasheet |
| Size installed | H 966 × W 800 × D 270 mmInverter on top, heaviest piece 77 kg, about 180 kg in total | H 910 × W 850 × D 260 mmInverter on top, heaviest piece 78 kg, 215 kg in total |
| View the quoteBook an InspectionQuoted as GoodWe 18 kWh single-phase with 10 kW inverter | View the quoteBook an InspectionQuoted as Sigenergy 18 kWh single-phase with 10 kW inverter | |
Next step
17.4 kWh usable · $7,838
18 kWh usable · $9,887
Equipment and datasheets
GoodWe 17.4 kWh usable: 2 × GW9.0-BAT-D-G20 battery modules (8.7 kWh usable each) and one GW9.999K-EHA-G20 inverter. Figures from the GoodWe datasheets for these models.
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.
Close, but not like for like
GoodWe 52.2 kWh usable with a 15 kW inverter ($17,481) and Sigenergy 54 kWh usable with a 20 kW inverter ($23,414), three-phase.
The inverters differ, so the $5,933 difference is not like for like.
Other sizes we install (5 GoodWe, 1 Sigenergy)
- GoodWe 32 kWh usable, single-phase, 10 kW inverter · $11,482 · View the quote
- GoodWe 40 kWh usable, single-phase, 10 kW inverter · $13,977 · View the quote
- GoodWe 48 kWh usable, single-phase, 10 kW inverter · $16,472 · View the quote
- GoodWe 32 kWh usable, three-phase, 10 kW inverter · $11,633 · View the quote
- GoodWe 32 kWh usable, three-phase, 15 kW inverter · $11,805 · View the quote
- Sigenergy 54 kWh usable, three-phase, 30 kW inverter · $23,651 · 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 GoodWe and Sigenergy
Is GoodWe or Sigenergy better?
Neither is better for every home. GoodWe costs less at all 12 matched sizes, by $559 to $3,434 without backup. GoodWe systems take solar panels up to 20 to 60 kW and Sigenergy up to 12 to 48 kW, depending on the inverter. The inspection confirms which suits your home.
Does backup cost more with Sigenergy?
Partial backup adds $500 on GoodWe, and $1,456 (single-phase) or $1,681 (three-phase) on Sigenergy, which includes a Sigen Gateway. With partial backup, GoodWe costs $1,740 to $4,616 less. Full house backup adds $800 on GoodWe and $1,981 on Sigenergy, on three-phase packages only.
Which has the longer warranty?
Both carry a 10-year battery warranty. Inverter warranties: GoodWe 10 years, Sigenergy 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 $5,933 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. GoodWe Verified Installer, installer code G10000622 · Sigenergy Certified Installer · New Energy Tech Consumer Code Approved Seller.