Sigenergy vs FoxESS: which battery suits your home?
How this site makes money. We don't earn money from any links on this site yet. If that changes, we'll update this notice first. We don't compare every battery, installer or energy plan in the market. How we make money
Short answer: Sigenergy has larger 8.76 kWh modules and its own controller; FoxESS has smaller 4.66 kWh steps and a bigger warranty throughput cap per kWh [SB-S060, SB-S054, SB-S055, SB-S059, E]. If you want to size closely, FoxESS is easier [SB-S054, E].
Side by side (as at 3 November 2026)
| Sigenergy SigenStor | FoxESS EQ4800 | |
|---|---|---|
| Module size (usable) | 8.76 kWh (BAT 10.0) [SB-S060, C] | 4.66 kWh [SB-S054, C] |
| Usable range | up to 6 modules per controller [SB-S042, C], about 52.6 kWh [SB-S060, E] | 9.32–41.93 kWh per stack [SB-S054, C] |
| Power | 4.6 kW continuous per module [SB-S060, C] | 4.48–20.16 kW nominal, by stack [SB-S054, C] |
| Warranty | 10 years, 70% or 33.29 MWh per module, first [SB-S059, C] | 10 years, 70% or 39.32 MWh (2 modules) … 176.94 MWh (9 modules), first [SB-S055, C] |
| Backup | backup switch 0 ms on the Energy Controller [SB-S200, C]; backup cost: No dated price yet | H3 Smart EPS 5–15 kW (three phase) [SB-S202, C]; single-phase backup: ask the installer |
| CEC listed until | 5 Jun 2027 (SigenStor systems) [SB-S069, C] | 14 Nov 2027 [SB-S072, C] |
| Dated price | No dated price yet | No dated price yet |
Where they really differ
- Warranty per kWh. Sigenergy caps at 33.29 MWh per 8.76 kWh module, about 3,800 full cycles. FoxESS's 2-module cap of 39.32 MWh on 9.32 kWh is about 4,200 [SB-S059, SB-S060, SB-S055, SB-S054, E]. Both end sooner if the battery drops to 70% [SB-S059, SB-S055, C].
- Step size. Two Sigenergy modules give 17.52 kWh; FoxESS reaches 13.98 kWh with 3 and 18.64 kWh with 4 [SB-S060, SB-S054, E].
- Price. Neither brand has a dated price we can show, so compare written quotes on price per usable kWh [SB-S060, SB-S054, E].
- Listing dates. Sigenergy systems are listed to 5 Jun 2027; FoxESS to 14 Nov 2027. A 2027 install inside those dates still qualifies [SB-S069, SB-S072, SB-S003, E].
- What the CEC lists. The CEC lists SigenStor systems with usable figures such as 10.4 or 15.6 kWh, not 8.76 per module, so check the system code on your quote [SB-S069, C].
Who each one suits
Sigenergy suits you if you want 17 kWh or more from one maker's battery and inverter [SB-S060, SB-S200, E].
Sigenergy is not for you if you want small steps: each module adds 8.76 kWh [SB-S060, C].
FoxESS suits you if you want to size in small steps or go big in one stack [SB-S054, C].
FoxESS is not for you if you need single-phase backup confirmed up front: the EPS figures we hold are for the three-phase H3 Smart [SB-S202, C].
Every FoxESS stack size from 9.32 to 41.93 kWh, with its warranty cap, is in everything on the FoxESS EQ4800 [SB-S054, SB-S055, C].
Ask your installer, in writing
- The exact model on the CEC approved list, its usable kWh and listing end date [SB-S026, SB-S003, C].
- How many STCs the quote assumes, and for which install date [SB-S004, C].
- What stays on in a blackout, and the line-item cost of backup.
- Warranty years, the 70% figure and the throughput cap.
Ask at least two accredited installers for a written quote that shows the model, usable kWh and the certificate count.
Rules checked 3 November 2026. Next scheduled check: before 1 January 2027 (STC step-down), and monthly for WA and NSW.