Deye SE-G5.1 Pro-B

LiFePO4 Battery Module – Deye SE-G5.1 Pro-B (Deye)

The Deye SE-G5.1 Pro-B is a low-voltage LiFePO4 (LFP) battery module engineered for safe, durable and flexible energy storage. Designed as a modular battery module for residential and commercial PV energy storage systems, it combines an intelligent BMS, natural cooling and multiple mounting options in a 19‑inch compatible enclosure to support scalable on‑site battery storage and increased PV self‑consumption.

Applications and use cases

The SE-G5.1 Pro-B is intended for integration into PV+storage systems where safety, expandability and system-level monitoring are required. Its modular architecture suits single-family homes, commercial rooftops and small to mid-size hybrid energy storage installations that demand compact low‑voltage battery modules with standardized mounting.

• Modular energy storage for residential and light commercial PV systems
• Stackable/parallel systems for scalable capacity increases (up to large commercial arrays)
• Low‑voltage battery bank for hybrid inverters and three‑phase inverters when multiple units are paralleled
• Applications requiring remote monitoring, firmware updates and CAN/RS485 communications

Key electrical and performance parameters

The SE-G5.1 Pro-B provides a 5.12 kWh usable capacity in a low‑voltage format with LiFePO4 chemistry for long cycle life and inherent thermal stability. It is managed by an intelligent Battery Management System that protects the pack and enables module auto‑networking for multi‑unit systems.

• Nominal capacity: 5.12 kWh (single module)
• Nominal battery voltage: 51.2 V (operating range 43.2 V – 57.6 V)
• Depth of discharge up to 90% for optimized usable energy
• Communication: CAN 2.0 and RS485 for BMS data, networking and integration with inverters and EMS

Battery and backup capabilities

The SE-G5.1 Pro-B is optimized for high discharge power and continuous cycling under a wide temperature envelope. Its LiFePO4 (LFP) chemistry is cobalt‑free, delivering improved safety characteristics and a long operational life suitable for daily cycling and backup use.

• Cobalt‑free LiFePO4 cells for improved safety and longevity
• Support for high discharge power suitable for peak shaving and backup loads
• Module auto‑networking and system expansion up to 64 units in parallel, enabling system capacities up to the quoted maximum (system dependent)
• Intelligent BMS providing cell balancing, protection and state monitoring

Operating conditions and reliability

The module is engineered for reliable operation across a wide ambient range and uses natural convection cooling with an IP20 enclosure rating for indoor installations. The specified charge/discharge temperature window ensures consistent performance from cold starts to hot environments.

• Operating temperature range for charging/discharging: -20 °C to 55 °C
• Degree of protection: IP20 (indoor use recommended)
• Natural cooling design (no forced-air fans required)
• Manufacturer warranty indication: 10 years (module-level warranty term)

Mechanical design and installation

The SE-G5.1 Pro-B is packaged in a compact 19‑inch compatible form factor that supports rack, wall and floor mounting to save space and simplify integration into existing battery racks or cabinets. Physical dimensions and weight make it manageable for modular deployment and service.

• 19‑inch standard design with three mounting methods: rack‑mounted, wall‑mounted and floor‑mounted
• Dimensions (H×W×D): 540 mm × 133 mm × 440 mm
• Weight: approximately 45 kg per module
• Eco‑friendly materials: non‑toxic, pollution‑free module construction