BYD Battery-Box Premium HVM 19.3 vs RCT Power Battery 5.7
Technical comparison · High voltage
Two high-voltage lithium iron phosphate batteries of very different size: one for a large home, one for a flat. The inverter decides before the capacity does, because each is declared for a different group.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 19.32 kWh | 5.18 kWh |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | — | 78 kg |
| Dimensions (W×D×H) | 58.5 × 29.8 × 192.7 cm | 34 × 34 × 83 cm |
| How long it lasts | ||
| Battery life cycles | 3094 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 | 59.77 MWh | — |
| Guaranteed remaining capacity | 60 % | 80 % |
| The numbers | ||
| Energy density | — | 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 |
| Battery voltage | 358.4 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 | — |
| 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
Manufacturer-declared values.
- Inverter: sixteen brands on the official list vs RCT Power Storage DC only → the battery choice follows the inverter, not the other way round.
- 19.32 kWh vs 5.18 kWh usable → the first covers a large home's consumption, the second a flat's.
- −10 to 50 °C and IP55 vs 5 to 40 °C and IP42 → the first can go in an unheated or more exposed room; the second wants an indoor, temperate one.
- 60% vs 80% capacity guaranteed at the end of the 10-year warranty → after ten years the manufacturer assures 60% on the first and 80% on the second.
Which one to choose
Choose BYD Battery-Box Premium HVM 19.3 if…
you have an inverter from the sixteen brands on the official list and consumption that needs a large reserve, and the house has a room for a module about two metres tall. You give up compactness and part of the capacity guaranteed at the end of the warranty.
Choose RCT Power Battery 5.7 if…
you have an RCT Power Storage DC inverter and a flat-sized reserve is enough, in a space where an 83 cm column can stand. You give up capacity and local-network control, which this one does not have.
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.