Sigenergy vs BYD: which battery suits your home?
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Short answer: Sigenergy is a full system with its own inverter (the Energy Controller); BYD sells the battery only, so it needs another maker's inverter, such as a Fronius GEN24 Plus [SB-S200, SB-S203, C]. Check the BYD model closely: the HVM's CEC listing ends 5 December 2026, while the HVM+ runs to 31 December 2027 [SB-S073, C].
Side by side (as at 3 November 2026)
| Sigenergy SigenStor | BYD Battery-Box HVS / HVM | |
|---|---|---|
| Module size (usable) | 8.76 kWh [SB-S060, C] | 2.56 kWh (HVS) / 2.76 kWh (HVM) [SB-S056, SB-S203, E] |
| Usable range | up to 6 modules per controller [SB-S042, C], about 52.6 kWh [SB-S060, E] | HVS 5.12–12.8 kWh; HVM 8.28–22.08 kWh [SB-S056, SB-S203, C] |
| Inverter | own Energy Controller, 5–12 kW single phase or 5–30 kW three phase [SB-S200, C] | battery only; works with compatible high-voltage inverters, e.g. Fronius GEN24 Plus [SB-S203, C] |
| Round-trip | Not found in maker's documents | ≥96% [SB-S056, SB-S203, C] |
| Warranty | 10 years, 70% or 33.29 MWh per module [SB-S059, C] | 10 years, 70% or a minimum throughput (HVS 12.8: 38.53 MWh; HVM 22.1: 68.31 MWh) [SB-S057, C] |
| CEC listed until | 5 Jun 2027 [SB-S069, C] | HVS 17 Jan 2027; HVM 5 Dec 2026; HVM+ 31 Dec 2027 [SB-S073, C] |
| Dated price | No dated price yet | No dated price yet |
Where they really differ
- One brand or two. Sigenergy's inverter and battery come from one maker [SB-S200, C]. BYD needs a separate inverter, so the warranty and support sit with two companies [SB-S203, E]. If you already have a compatible high-voltage hybrid, BYD can add to it [SB-S203, C].
- The HVM listing date. A battery must be on the CEC list on your install date to earn the federal discount [SB-S003, C]. HVM drops off after 5 Dec 2026; ask for HVM+ or HVS if you install later [SB-S073, E].
- Size. BYD's HVM stops at 22.08 kWh per stack. Sigenergy goes past 50 kWh on one controller [SB-S203, SB-S042, SB-S060, E].
- Warranty per kWh. HVM 22.1's 68.31 MWh is about 3,100 full cycles; Sigenergy's 33.29 MWh per module is about 3,800 [SB-S057, SB-S059, SB-S060, E].
Who each one suits
Sigenergy suits you if you're buying a new system and want battery and inverter from one maker [SB-S200, E].
Sigenergy is not for you if you want small steps: each module adds 8.76 kWh [SB-S060, C].
BYD suits you if you already own a compatible inverter such as a Fronius GEN24 Plus [SB-S203, C].
BYD is not for you if you want a price to check before you call, or an install after 5 Dec 2026 on the HVM [SB-S073, E].
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.