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The BYD Battery-Box Premium HVM 13.8 is a high-voltage lithium iron phosphate battery with a modular design, expandable at any time. BYD publishes a list of compatible inverters, and that is where the pairing should be checked.
The list covers sixteen brands, among others Fronius, Kostal, SMA, KACO, Solis, Sungrow, and for each model it gives the number of modules allowed and the minimum firmware version: before buying, it's worth checking that the inverter already chosen is on the list. An internet connection is not mandatory but recommended; initial setup needs the manufacturer's app.
| Parameter | Value | Source |
|---|---|---|
| Dimensions | 58.5 × 29.8 × 146.1 cm (23.0 × 11.7 × 57.5 in) | manufacturer website |
| Usable capacity | 13.8 kWh | Declared by the brand |
| Depth of discharge | 100 % | Declared by the brand |
| Cell chemistry | LFP (lithium iron phosphate) | Declared by the brand |
| Expandable | Yes | Declared by the brand |
| Battery voltage | 256 V | Declared by the brand |
| 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. | Declared by the brand |
| Rated cycles | 3650 cicli | Declared by the brand |
| Warranty | 10 anni | Declared by the brand |
| Guaranteed throughput | 42.69 MWh | Declared by the brand |
| Guaranteed remaining capacity | 60 % | Declared by the brand |
| Round-trip efficiency | 96 % | Declared by the brand |
| Ingress protection | IP55 | Declared by the brand |
| Mounting | Floor standing | Declared by the brand |
| Minimum temperature | -10 °C | Declared by the brand |
| Maximum temperature | 50 °C | Declared by the brand |
| Works without internet | Fully | Declared by the brand |
| Local control | Local network | Declared by the brand |
| Open protocols | CAN bus | Declared by the brand |
| App required for setup | Yes | Declared by the brand |
| Declared standards | CE, UN 38.3, IEC 62619, VDE 2510-50 | Declared by the brand |
| Nominal capacity | — | Not declared |
| Cell supplier | — | Not declared |
| Maximum expanded capacity | — | Not declared |
| Continuous output | — | Not applicable |
| Phases | — | Not applicable |
| Maximum charge power | — | Not applicable |
| Backup power | — | Not applicable |
| Backup phases | — | Not applicable |
| Switchover time | — | Not applicable |
| Black start | — | Not applicable |
| Grid charging | — | Not applicable |
| Dynamic tariffs | — | Not applicable |
| EV charger integration | — | Not applicable |
| Heat pump integration | — | Not applicable |
| Virtual power plant | — | Not applicable |
| Capacity at end of cycle life | — | Not declared |
| Standby consumption | — | Not declared |
| Cell heating | — | Not declared |
| Noise level | — | Not declared |
| Home Assistant integration | — | Not declared |
| Where the data is hosted | — | Not declared |
| Remote updates | — | Not declared |
| Battery passport | — | Not declared |
| Carbon footprint | — | Not declared |
| Recycled content | — | Not declared |
| Grid connection power | — | Not applicable |
| Official list price | — | Not declared |
A manual or a datasheet counts as a source even when the original file is hosted elsewhere: what matters is the document, not the server. Where that happens, it is stated above.
These numbers are calculated, not stated: they have no source to cite, they have a formula you can redo. The price used is the manufacturer's list price, which is stable and the same in every country — not a shop's price on the day.
