BYD Battery-Box Premium HVM 8.3 vs RCT Power Battery 7.6
Technical comparison · High voltage
Two high-voltage LFP home batteries, floor-standing. The inverter decides: the BYD has an official list of sixteen compatible brands, the RCT is declared for RCT Power Storage DC inverters, and the two work at different nominal voltages.
| Parameter | ||
|---|---|---|
| In brief | ||
| Usable capacity | 8.28 kWh | 6.91 kWh |
| Cell chemistry | LFP (lithium iron phosphate) | LFP (lithium iron phosphate) |
| Weight | — | 102 kg |
| Dimensions (W×D×H) | 58.5 × 29.8 × 99.5 cm | 34 × 34 × 106 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 | 25.62 MWh | — |
| Guaranteed remaining capacity | 60 % | 80 % |
| The numbers | ||
| Energy density | — | 67.7 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 | — | 15.36 kWh |
| Battery voltage | 153.6 V | 307 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 (307 V nominali, 240-346 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
- 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.
- Battery voltage, 153.6 V vs 307 V → it has to fall within the range the inverter accepts: check it before buying.
- Usable capacity, 8.28 kWh vs 6.91 kWh → about 1.4 kWh more with the BYD.
- Capacity guaranteed after the 10-year warranty, 60% vs 80% → over the same years, the RCT guarantees a smaller loss.
Which one to choose
Choose BYD Battery-Box Premium HVM 8.3 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, full operation without internet and IP55 protection (manufacturer-declared values). The trade-off: the first start-up needs the app, and the capacity guaranteed at the end of the warranty is lower.
Choose RCT Power Battery 7.6 if…
your inverter is an RCT Power Storage DC and the room is sheltered and temperate: 6.91 kWh usable in a 34 × 34 cm footprint, expandable to 15.36 kWh, with a higher capacity guaranteed at the end of the warranty. The trade-off: IP42 and 5 to 40 °C narrow the choice of room, there is no local control, and the usable energy is lower.
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.