BYD Battery-Box Premium HVS 12.8 vs RCT Power Battery 11.5
Technical comparison · High voltage
Two high-voltage LFP home batteries of similar size. More than capacity (12.8 kWh against 10.37 kWh usable), the inverter decides: BYD lists sixteen compatible brands, while RCT is matched to RCT Power Storage DC inverters. Manufacturer-declared figures.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 12.8 kWh | 10.37 kWh |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 205 kg | 150 kg |
| Dimensions (W×D×H) | 58.5 × 29.8 × 146.1 cm | 34 × 34 × 152 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 | 69.1 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 | 23 kWh |
| Battery voltage | 512 V | 461 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 (461 V nominali, 360-520 V di range). Questa è la taglia abbinata alla Storage DC 10.0 LAN nel sistema misurato dalla HTW. |
| Round-trip efficiency | 96 % | — |
| Standby consumption | — | 5 W |
| SPI index (HTW Berlin) | — | 96.4 % |
| HTW test power class | — | 10 kW class |
| HTW test edition | — | Stromspeicher-Inspektion 2026 |
| 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
- Inverter: sixteen brands on the BYD list, RCT Power Storage DC inverters for RCT → if the inverter is already there, the choice is often made at this point.
- Expansion to 38.4 kWh vs 23 kWh → how far you can grow the system without replacing the battery.
- Operating range -10 to 50 °C vs 5 to 40 °C → a cold garage or a hot utility room rules one of them out.
- Guaranteed capacity at end of warranty 60 % vs 80 % → what is left after ten years.
Which one to choose
Choose BYD Battery-Box Premium HVS 12.8 if…
you already own an inverter from another brand on the official list, you want room to grow to 38.4 kWh, or you are installing in an unheated garage that drops as low as -10 °C. It works fully without internet and can be controlled over the local network. The trade-off: 205 kg to stand on the floor, and a warranty that runs out first on delivered energy (38.53 MWh), with guaranteed capacity of 60 % at the end.
Choose RCT Power Battery 11.5 if…
your inverter is an RCT Power Storage DC, whose declared 120–600 V battery-side range covers this size. It takes 34 × 34 cm of floor, weighs 150 kg, and the 10-year warranty guarantees 80 % capacity at the end. The trade-off: it operates between 5 and 40 °C with ip42 protection, so a dry indoor room that never freezes, it expands only to 23 kWh, and it has no local control.
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.