Deye 5.1kW AI‑W Stackable Lithium Battery

The 5.1kW Deye AI‑W Stackable Lithium Battery is a high‑performance, modular energy storage solution designed for residential and light commercial solar and backup power systems. Built around advanced LiFePO₄ (Lithium Iron Phosphate) chemistry, this battery delivers exceptional safety, long service life, and reliable power output in demanding conditions.

With its stackable, floor‑mounted design, the Deye AI‑W battery allows you to scale capacity easily as your energy needs grow. Each module provides 5.12kWh of usable energy, and up to 6 batteries per stack can be combined for higher capacity systems, making it ideal for homes, offices, and small businesses.

Key Benefits

• High power output suitable for hybrid and off‑grid inverter systems
• Stackable modular design for flexible system expansion
• Long lifespan with over 6,000 charge and discharge cycles
• Cobalt‑free lithium iron phosphate chemistry for enhanced safety
• Intelligent Battery Management System for protection and optimisation
• IP65‑rated enclosure for indoor and outdoor installations

Performance and Reliability

The Deye AI‑W 5.1kW battery features a built‑in intelligent BMS that continuously monitors voltage, current and temperature at cell level. This ensures balanced charging and discharging, protects against over‑charge, over‑discharge, short circuit and extreme temperatures, and helps maximise battery lifespan and efficiency.

With a nominal voltage of 51.2V and 94% round‑trip energy efficiency, the system delivers consistent performance while minimising energy losses. The battery operates reliably in a wide temperature range from ‑20°C to 55°C, making it suitable for varied installation environments.

Safe, Durable Design

Safety is a core feature of the Deye AI‑W range. The use of non‑toxic, non‑polluting LiFePO₄ cells provides superior thermal stability and reduced fire risk compared to conventional lithium batteries. The enclosure is rated IP65, offering strong protection against dust and water ingress, while natural cooling ensures silent operation with no moving parts.

Smart and Scalable Energy Storage

The flat, compact form factor enables quick installation with no internal wiring between stacked modules. Automatic networking allows multiple batteries to communicate seamlessly, while CAN and RS485 communication ports ensure compatibility with a wide range of low‑voltage hybrid inverters. The system also supports remote monitoring and firmware upgrades for easy maintenance.

Typical Applications

• Residential solar energy storage
• Load shifting and self‑consumption optimisation
• Backup power during grid outages
• Small commercial and light industrial ESS installations

Technical Overview

• Nominal Energy: 5.12kWh per module
• Usable Energy: Up to 4.6kWh per module
• Battery Chemistry: Lithium Iron Phosphate (LiFePO₄)
• Nominal Voltage: 51.2V
• Rated Power: 5.1kW
• Cycle Life: ≥ 6,000 cycles at 90% depth of discharge
• Enclosure Rating: IP65
• Installation: Floor‑mounted, stackable
• Warranty: 10 years

The Deye AI‑W 5.1kW Stackable Lithium Battery is a future‑ready energy storage solution engineered for safety, scalability and long‑term reliability, making it an excellent choice for modern solar and backup power systems.