BYD Battery-Box Premium HVS 12.8 vs RCT Power Battery 9.6
Technical comparison · High voltage
Two high-voltage home batteries, both LFP and floor-standing. The inverter decides: the BYD has an official list of sixteen compatible brands, while the RCT is declared for RCT Power Storage DC inverters.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 12.8 kWh | 8.64 kWh |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 205 kg | 126 kg |
| Dimensions (W×D×H) | 58.5 × 29.8 × 146.1 cm | 34 × 34 × 129 cm |
| How long it lasts | ||
| Battery life cycles | 3010 cicli | 3650 cicli |
| The limit that runs out first | energia garantita | anni di garanzia |
| Rated cycles | 3650 cicli | — |
| Warranty | 10 anni | 10 anni |
| Guaranteed throughput | 38.53 MWh | — |
| Guaranteed remaining capacity | 60 % | 80 % |
| The numbers | ||
| Energy density | 62.4 Wh/kg | 68.6 Wh/kg |
| Identity | ||
| Use tier | F4 — House-sized (8–20 kWh) | F4 — House-sized (8–20 kWh) |
| Category specs | ||
| Depth of discharge | 100 % | 90 % |
| Expandable | Yes | Yes |
| Maximum expanded capacity | 38.4 kWh | 19.2 kWh |
| Battery voltage | 512 V | 384 V |
| Declared compatible inverters | Sedici marchi nell'elenco ufficiale: Fronius, GoodWe, Viessmann, KOSTAL, SMA, Sungrow, GE, KACO, KACO NH, Ingeteam, Solis, Canadian Solar, Deye, Solplanet, Western CO, Sosen. Per ciascun modello l'elenco dà il numero di moduli ammessi e la versione minima del firmware. | RCT Power Storage DC (6.0/8.0/10.0 LAN, 12.0): intervallo di tensione lato batteria 120-600 V dichiarato dall'inverter, entro cui rientra questa taglia (384 V nominali, 300-432 V di range). |
| Round-trip efficiency | 96 % | — |
| Standby consumption | — | 5 W |
| Ingress protection | IP55 | ip42 |
| Mounting | Floor standing | Floor standing |
| Minimum temperature | -10 °C | 5 °C |
| Maximum temperature | 50 °C | 40 °C |
| Works without internet | Fully | — |
| Local control | Local network | None |
| Open protocols | CAN bus | — |
| Remote updates | Can be disabled | — |
| App required for setup | Yes | — |
| Declared standards | CE, UN 38.3, IEC 62619, VDE 2510-50 | CE, UN 38.3, IEC 62619 |
The differences that matter
- Compatible inverters, list of sixteen brands vs RCT Power Storage DC inverters → with the BYD you start from the inverter you already have; with the RCT the pairing is with RCT inverters.
- Usable capacity, 12.8 kWh vs 8.64 kWh → expandable to 38.4 kWh vs 19.2 kWh.
- Capacity guaranteed after the 10-year warranty, 60% vs 80% → over the same years, the RCT guarantees a smaller loss.
- Protection and temperature, IP55 and -10 to 50 °C vs IP42 and 5 to 40 °C → the BYD tolerates a less sheltered room.
Which one to choose
Choose BYD Battery-Box Premium HVS 12.8 if…
you already own an inverter from another brand, or have not chosen one yet: the official list includes Fronius, SMA, Sungrow and KOSTAL among others, with permitted module count and minimum firmware for each model. It also offers local-network control and full operation without internet (manufacturer-declared values). The trade-off: it weighs 205 kg and stands 146 cm tall, the first start-up needs the app, and the capacity guaranteed at the end of the warranty is lower.
Choose RCT Power Battery 9.6 if…
your inverter is an RCT Power Storage DC and you want a more compact unit on the floor: 126 kg and a 34 × 34 cm footprint. The trade-off: IP42 and 5 to 40 °C mean choosing the room with more care, there is no local control, and expansion stops at a lower ceiling.
Where to buy
The purchase links are the same as on the two product pages and don't influence the verdict. The product pages have the complete data.