Deye AI-W5.1-B 5.1 kWh – Plug-in & scalable battery storage with lithium iron phosphate technology

The Deye AI-W5.1-B is a powerful, safe and modularly expandable energy storage module with a capacity of 5.1 kWh. With its robust construction, simple installation and high scalability, it is ideal for residential and commercial photovoltaic systems. Thanks to cobalt-free LiFePO₄ technology and an intelligent battery management system, the module is particularly durable, efficient and environmentally friendly.

Highlights at a glance

• High security: Cobalt-free lithium iron phosphate battery cells (LiFePO₄)
   
• Scalable: Up to 6 modules per cluster, 36 modules in total (max. 184 kWh)
   
• Flexible deployment: Wall or floor mounting possible, stackable design
   
• Long service life: Over 6,000 charge cycles at 90% DOD
   
• Robust & weatherproof: IP65 protection rating for outdoor use
   
• Convenient: Automatic network, remote maintenance & firmware updates

Versatile energy storage for sustainable projects

Whether for a detached house, multi-family house or commercial business, the Deye AI-W5.1-B covers a wide range of requirements for modern energy storage. The efficient use of renewable energies reduces electricity costs and increases the proportion of self-consumption. The modular system can be easily expanded to keep pace with growing energy demand.

Safety & reliability at the highest level

Thanks to LiFePO₄ battery chemistry, the energy storage system is particularly safe, thermally stable and durable. The integrated battery management system (BMS) reliably protects against overcharging, overheating and short circuits. Passive cooling without fans enables low-noise and low-maintenance operation, even at temperatures from -20 °C to +55 °C.

Easy installation & maintenance

The flat, stackable design allows flexible placement on the wall or on the floor. No complex cabling is necessary. The modules recognise each other automatically in the system and can be conveniently monitored and updated via remote access.

Who is the Deye AI-W5.1-B suitable for?

This storage unit is ideal for:

• Private households that want to expand their solar system flexibly
   
• Commercial businesses that require modular and fail-safe storage solutions
   
• Installers who rely on simple and time-saving systems
   
• Sustainability-conscious users who value pollutant-free components

FAQs on the DEYE AI-W5.1-B energy storage module

How much energy is actually usable per module?

A single module delivers 5.12 kWh gross capacity. Of this, around 4.6 kWh is usable at a depth of discharge of 90% (DoD), ideal for modular storage solutions with high efficiency.

Can I expand the system later?

Yes, up to six modules are possible per tower, which corresponds to 30.72 kWh per stack. By connecting up to six towers in parallel, the system can be scaled to a total capacity of around 184 kWh without additional hardware.

With which inverters does the module work without an additional interface box?

The module is plug-&-play compatible with three-phase Deye hybrid inverters of the low-voltage series. Communication takes place directly via CAN or RS485 without a separate communication box. This is included with the PDU and the base. Without this PDU, the storage block alone cannot be connected to the inverter. Please contact sales if you have any questions.

Is active cooling necessary?

No, natural convection is sufficient to ensure reliable operation. According to the manual, only an air gap of at least 20 cm behind the module must be maintained so that the heat can dissipate unhindered.

Must the module be fully charged before initial commissioning?

Yes, an initial charge to 100% is recommended in order to correctly record the State of Charge (SoC). If this step is omitted, deviations in SoC values or an inaccurate charge status display may occur during operation. The storage unit can also be charged via the grid if there is too little solar energy. You can set up this function in the Deye inverter.

Scope of delivery Deye AI-W5.1-BATT (Single 5.12 kWh battery module):

Module type

• This is a pure expansion module (slave unit) for an existing Deye AI-W5.1-B system. It requires a separate BMS control unit for operation.

1 x Deye AI-W5.1-BATT battery module (5.12 kWh)

• A pure battery module with 5.12 kWh that is stacked on a BMS unit or another battery module.

1 x connecting bridge / parallel connection cable

• Short, robust cables or a fixed bridge to connect this module to an existing module.

1 x earthing cable (short)

• A short protective conductor cable for connection to the earth point of the neighbouring module.

1 x installation accessories (tower mounting)

• Includes screws or locking mechanisms to securely stack the module onto an existing unit.

1 x installation instructions for expansion module

• Instructions specifically describing the expansion of an existing tower system.