What is the HVS 12.8?
- Usable energy: 12.8 kWh from five 2.56 kWh HVS modules (102.4 V, 38 kg each)
- System voltage: 512 V nominal (400–600 V operating) — high-voltage architecture with low current and small cabling
- Current: 25 A continuous, 50 A peak for 3 seconds, ≥96% round-trip efficiency
- IP55 rating: floor-standing, indoor or outdoor installation, 1461 × 585 × 298 mm, 205 kg
- Warranty: datasheet states 10 years · Southeast Asia terms: 5-year product plus 7-year performance at 60% capacity, extended to 10 years when internet-connected
The BYD Battery-Box Premium HVS 12.8 is a floor-standing high-voltage LFP battery delivering 12.8 kWh usable from five 2.56 kWh modules connected in series for a 512 V system. BYD is one of the few storage brands that manufactures its own cells. The Battery-Box family's strengths are modular flexibility and an unusually broad compatibility list covering Fronius, SMA, Sungrow, GoodWe, KOSTAL, Solis, Deye, Canadian Solar and Hoymiles per the official Compatible Inverter List.
What is the Battery-Box Premium HVS, and where does it fit?
HVS stands for High Voltage Small — a high-voltage architecture using 2.56 kWh modules in series to reach 512 V. The advantage of high voltage is lower system current: at equal power, cabling is smaller, resistive losses are lower and heat build-up is materially less than a 48 V system. One specification to read carefully is the 25 A continuous discharge current. Multiplied by 512 V that is roughly 12.8 kW in theory, but usable power is also bounded by the paired inverter, so battery and inverter must be balanced at design stage. The other point that deserves attention is warranty. The Southeast Asia warranty terms differ from the 10 years printed on the datasheet: a 5-year product warranty plus a 7-year performance warranty at 60% remaining capacity, extended to 10 years when the system is internet-connected so the manufacturer can monitor it. We explain these terms to every client before purchase.
Highlights from the datasheet
- 512 V high-voltage architecture: much lower current than 48 V, meaning smaller cable, lower losses and less heat
- Modular capacity: the HVS family builds capacity from 2.56 kWh modules, letting the system be sized to need
- IP55, indoor or outdoor: more flexible than rack batteries limited to indoor installation, though we still specify a sheltered position
- ≥96% round-trip efficiency: little energy lost between charging and discharging
- Exceptionally broad inverter list: Fronius, SMA, Sungrow, GoodWe, KOSTAL, Solis, Deye, Canadian Solar and Hoymiles
- LFP cells from a vertically integrated manufacturer: BYD makes its own cells rather than assembling purchased ones
- 38.53 MWh minimum warranted throughput: a clearly stated figure for estimating service life against real usage patterns
Key specifications (HVS 12.8)
| Specification | Datasheet value |
|---|---|
| Usable Energy | 12.8 kWh |
| Battery Module / Number of Modules | HVS (2.56 kWh, 102.4 V, 38 kg) จำนวน 5 โมดูล |
| Nominal Voltage | 512 V |
| Operating Voltage | 400 - 600 V |
| Max Output Current / Peak Output Current | 25 A / 50 A (3 วินาที) |
| Battery Type | Lithium Iron Phosphate (LiFePO4) |
| Depth of Discharge (test condition) | 100% DOD (ทดสอบที่ 0.2C ชาร์จ/คายประจุ ที่ +25 °C) |
| Minimum Throughput Energy (warranty) | 38.53 MWh |
| Round-trip Efficiency | ≥ 96% |
| Dimensions (H/W/D) / Weight | 1461 x 585 x 298 mm / 205 kg |
| Protection Rating | IP55 (ติดตั้งในหรือนอกอาคาร ตั้งพื้น) |
| Operating Temperature | -10 °C ถึง +50 °C (มี power derating ระหว่าง -10 °C ถึง +5 °C) |
| Communication | CAN / RS485 |
| Scalability | ขนานได้สูงสุด 3 ทาวเวอร์ รวม 38.4 kWh (ห้ามขนานร่วมกับระบบ HVM และทุกทาวเวอร์ต้องมีจำนวนโมดูลเท่ากัน) |
| Compatible Inverters | ใช้ 2-5 โมดูล กับ Fronius Symo/Primo GEN24 Plus, SMA STP 5.0-10.0 SE, Sungrow SH5.0-10RT, GoodWe ET/EH/BH, KOSTAL Plenticore, KACO Blueplanet hybrid, Solis S6-EH3P(3-10)K-H / (12-20)K-H / (29.9-50)K-H, Deye SUN-(5-20)K-SG01HP3-EU-AM2, Canadian Solar CSI-TE/HE, Hoymiles HYT-HV-EUG1 (ตาม Compatible Inverter List V2.21) |
| Warranty | datasheet ระบุ 10 ปี — เงื่อนไขฉบับเอเชียตะวันออกเฉียงใต้: ตัวสินค้า 5 ปี + สมรรถนะเหลือ 60% 7 ปี (ขยายเป็น 10 ปีเมื่อเชื่อมต่ออินเทอร์เน็ต) |
Note: every figure above comes straight from the BYD Lithium Battery Co., Ltd. (ตาม datasheet ฉบับปัจจุบัน) — บริษัทในเครือ BYD Company Limited datasheet. Actual system design (strings per MPPT, cable sizing, breakers) must be calculated for each site.
Why this model suits Phuket
- IP55 gives siting flexibility: many Phuket homes lack a sealed plant room, so an outdoor-capable battery widens the options
- −10 to +50°C operating range: comfortably covers local conditions, though shaded installation avoids the peak temperatures that accelerate degradation
- Three-phase villas and larger homes: pairs with high-voltage hybrids such as the Deye SUN-SG01HP3 or Solis S6-EH3P per the official list
- Humidity and salt air: IP55 copes well, but on seafront properties we always position it away from direct salt spray
Who it suits
- Large homes and pool villas: needing around 12–13 kWh for overnight backup
- High-voltage hybrid systems: using inverters from BYD's official compatibility list
- Properties without an indoor plant room: IP55 permits covered semi-open locations
- Owners who value cell manufacturing provenance: BYD produces its own cells
- Projects wanting inverter flexibility: compatibility spans more brands than most competitors
Summary
The BYD Battery-Box Premium HVS 12.8 delivers 12.8 kWh usable at 512 V, suiting larger Phuket homes and villas running high-voltage hybrid inverters. High-voltage architecture cuts current and cable size, IP55 allows outdoor installation, and the compatibility list is unusually broad. Note the regional warranty structure: 5-year product plus 7-year performance, extended to 10 years when internet-connected.
See other models from this brand on the BYD overview, or browse all the equipment we install.
Download the datasheet (PDF) — full manufacturer specification sheet