BYD Battery-Box Premium HVS
A modular high-voltage LFP battery of 2 to 5 modules (5.12 to 12.8 kWh usable), with IP55 protection and a 10-year warranty.
- Best for modular high-voltage
- Installed battery
- 5.12-12.8 kWh
- 10-year warranty
- Made by BYD.
- Energy: 5.12 to 12.8 kWh usable, built from 2 to 5 modules of 2.56 kWh at 100% depth of discharge.
- A high-voltage battery only: it connects to a compatible inverter and BYD refers to a separate compatibility list.
- Up to three identical stacks in parallel for 38.4 kWh; round-trip efficiency of 96% or more.
- IP55, indoor or outdoor, floor stand. The numbers on this page are for the smallest stack (HVS 5.1), unless stated.
Not tested by us
We have not tested the BYD Battery-Box Premium HVS. The figures on this page come from the sources listed at the end of the page, checked on 10 November 2026, and we do not show prices. "Best for" is based on what the maker says the product is designed for, not on our own tests.
Key figures
5.12-12.8 kWh
Usable energy (2 to 5 modules)
96%+
Round-trip efficiency
10 years
Warranty
Specifications
Last checked on 10 November 2026. The grey text under each name explains what the value means.
| Specification | Value |
|---|---|
| Storage | |
| CapacityHow much energy the battery stores. Bigger means longer runtime or more of your own solar power used later. | Rated energy not listed; usable energy 5.12 / 7.68 / 10.24 / 12.8 kWh for 2 / 3 / 4 / 5 modules (HVS 5.1, 7.7, 10.2, 12.8) |
| Usable capacityThe part of the stored energy you can actually use. It is lower than the nominal capacity. | 5.12 to 12.8 kWh (2.56 kWh per module), measured at 100% depth of discharge, 0.2C, 25 °C; usable energy may vary with the inverter brand |
| Depth of dischargeHow much of the battery can be emptied without harming it. 90% means 10% is kept in reserve. | 100% (test condition for the usable energy) |
| Battery chemistryLFP (lithium iron phosphate) cells are known for long life and stable behaviour with heat. | Lithium iron phosphate (LiFePO4) |
| Cycle lifeHow many full charge and discharge cycles the cells are rated for before they hold less than the stated share of their original capacity. | Not stated as a cycle number; the warranty uses a throughput limit (HVS 5.1: 15.41 MWh) |
| ExpansionExtra battery units that add storage to the same system. | 2 to 5 modules in series per stack; up to three identical stacks in parallel (38.4 kWh maximum) |
| Power | |
| Charge and discharge powerHow fast the battery can take in and give out energy. It sets how many devices it can serve at once. | Maximum output current 25 A, peak 50 A for 3 seconds (all sizes); power derating between -10 °C and +5 °C. BYD gives amps: about 5.1 kW at 204.8 V on HVS 5.1 and about 12.8 kW at 512 V on HVS 12.8 |
| Round-trip efficiencyThe share of the energy you put in that comes back out. The rest is lost as heat. | 96% or more |
| Backup in a power cutWhether it can keep selected circuits running during a grid outage. | Listed for on-grid, on-grid with backup and off-grid use; the backup function itself comes from the inverter |
| Solar | |
| Solar inverterTurns the DC power from solar panels into AC for the home. Built in means no separate solar inverter is needed. | None: this is the battery only. BYD says it works with leading single- and three-phase inverters and refers to a compatibility list |
| Connection and housing | |
| Grid connectionThe supply type it is built for. Check it matches your home's supply. | Not applicable: the battery connects to an inverter (nominal 204.8 to 512 V depending on the size, high-voltage DC) |
| Dimensions (H × W × D)Check the wall or floor space before you buy, including room for airflow and cables. | HVS 5.1: 762 × 585 × 298 mm (2 modules, the smallest stack). Taller stacks: 995 mm (HVS 7.7), 1,228 mm (HVS 10.2), 1,461 mm (HVS 12.8); width and depth stay the same |
| WeightMatters for lifting, wall mounting and moving it. | HVS 5.1: 91 kg; 129 kg (HVS 7.7), 167 kg (HVS 10.2), 205 kg (HVS 12.8). One module weighs 38 kg |
| Protection ratingIP ratings show protection from dust and water. IP55 and IP65 are rated for outdoor-style exposure; check the installation guidance. | IP55, indoor or outdoor; floor stand |
| Operating temperatureThe range it is rated to work in. Cold and heat can reduce performance. | -10 to +50 °C |
| ConnectivityHow you monitor and control it, usually through an app. | CAN and RS485 |
| CertificationsSafety and grid standards the maker says the product meets. | VDE 2510-50, IEC 62619, CEC, CE, UN 38.3 |
| Warranty | |
| WarrantyThe period the maker covers. Read the terms: conditions and capacity guarantees differ. | 10 years; conditions apply. The Europe warranty letter adds a performance warranty: 60% of usable energy after 10 years or the minimum throughput energy, whichever comes first (HVS 5.1: 15.41 MWh, HVS 12.8: 38.53 MWh) |
Compatible with
What BYD says this product works with. Anything not listed here is not confirmed.
- Inverters
- BYD says the battery is compatible with leading single- and three-phase inverters and refers to a compatibility list for the required number of modules per inverter. That list is not in the datasheet.
- Expansion
- Add modules to a stack (up to 5) or add parallel stacks (up to three identical stacks).
- Mounting
- Floor stand only.
Rules where you live
An installed battery normally needs a qualified electrician, and in many countries you must also tell your grid operator, especially if it can export. This is not a plug-in battery. Rules, incentives and tax treatment differ by country: see our country guides for what applies where you live.
Strengths and things to check
Strengths
- Modular: 5.12 to 12.8 kWh in one stack, 38.4 kWh with three stacks
- Round-trip efficiency of 96% or more
- IP55, indoor or outdoor
- 10-year warranty with a stated performance guarantee
- Wide inverter compatibility according to BYD
Worth checking before you buy
- A battery only: you need a compatible high-voltage inverter
- Heavy: 91 kg for the smallest stack, 205 kg for the largest
- No cycle rating; the warranty is based on throughput
- The compatibility list is not in the datasheet
Change log
We record changes to this page here, so you can see when figures such as the warranty were last updated.
- 10 November 2026
- Page published. Warranty at publication: 10 years, with a performance warranty (60% of usable energy or the minimum throughput energy). Figures are from BYD's HVS datasheet V1.4; BYD also lists a BCU 2.0 version with the same figures. This page does not cover the larger HVM or HVL ranges.
Where this information comes from
We have not tested this battery. Every figure above comes from BYD's Battery-Box Premium HVS datasheet (V1.4, December 2024), BYD's limited warranty letter for Europe and the Battery-Box website, last checked on 10 November 2026. Dimensions and weight are for the smallest stack (HVS 5.1) unless stated. A value that the sources do not state is shown as not stated.
We do not show prices, because they depend on the installer's quote.
- Manufacturer BYD Battery-Box Premium HVS datasheet (V1.4, December 2024)
- Manufacturer BYD Battery-Box Premium HVS & HVM limited warranty, Europe (EN)
- Manufacturer BYD Battery-Box website (Premium HVS and LVS overview)
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Common questions about BYD Battery-Box Premium HVS
How much does the BYD Battery-Box Premium HVS store?
BYD lists 5.12, 7.68, 10.24 or 12.8 kWh usable, for stacks of 2, 3, 4 or 5 modules of 2.56 kWh. Up to three identical stacks can run in parallel for 38.4 kWh.
Does it include an inverter?
No. It is a high-voltage battery only. BYD says it works with leading single- and three-phase inverters; ask your installer to check the compatibility list for your inverter.
How long is the warranty?
BYD states 10 years, with conditions. Its Europe warranty letter also guarantees 60% of usable energy after 10 years or the minimum throughput energy, whichever comes first.
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