BYD Battery-Box Premium HVS 12.8 vs RCT Power Battery 5.7
Technical comparison · High voltage
The choice here is one of scale: 12.8 kWh usable against 5.18 kWh. The inverter matters too, since BYD lists sixteen compatible brands while the RCT data covers only the manufacturer's own Storage DC series.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 12.8 kWh | 5.18 kWh |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | 205 kg | 78 kg |
| Dimensions (W×D×H) | 58.5 × 29.8 × 146.1 cm | 34 × 34 × 83 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 | 66.4 Wh/kg |
| Identity | ||
| Use tier | F4 — House-sized (8–20 kWh) | F3 — Flat-sized (3–8 kWh) |
| Category specs | ||
| Depth of discharge | 100 % | 90 % |
| Expandable | Yes | Yes |
| Maximum expanded capacity | 38.4 kWh | — |
| Battery voltage | 512 V | 230 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 (230 V nominali, 180-260 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
- Usable capacity: 12.8 vs 5.18 kWh → the RCT carries less than half as much into the evening as the BYD.
- Weight and height: 205 kg and 146 cm vs 78 kg and 83 cm → the BYD needs a floor and an access route for a much heavier unit; the RCT is easier to move and place.
- Inverters: sixteen brands in the official list vs the RCT Power Storage DC series → with another maker's inverter, the RCT is not among the declared pairings.
- Warranty: 10 years on both, with 60 % of capacity guaranteed at the end for BYD and 80 % for RCT → same years, but RCT guarantees more capacity at the end. Figures as declared by the manufacturers.
Which one to choose
Choose BYD Battery-Box Premium HVS 12.8 if…
A system that has to store several kWh by day for the evening, with an inverter from the BYD list and a room that may drop below 5 °C. It works fully without internet, can be read over the local network, and remote updates can be switched off. The cost is 205 kg and 146 cm of height to place, and a lower guaranteed capacity at the end of the warranty.
Choose RCT Power Battery 5.7 if…
A small system with an RCT Power Storage DC inverter and an indoor room above 5 °C, where an 83 cm column weighing 78 kg is easy to place. You give up local control, accept IP42, and the usable capacity stays a little over 5 kWh.
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.