Deye AI-W5.1-B Energy Storage 20 kWh - Pluggable & Scalable Battery Storage
Description
Product information
The Deye AI-W5.1-B in the 20 kWh version is a powerful, pluggable and modularly expandable energy storage system for reliable use in private as well as commercial PV systems. With a capacity of 20.48 kWh, robust housing and modern battery management system, this storage system offers a long-lasting, flexible and safe solution for maximising the self-consumption rate.
Highlights at a glance
- High storage capacity: 20.48 kWh for large energy requirements
- Powerful charge/discharge current: Up to 250 A for fast energy transfer
- Low-voltage battery system: 51.2 V voltage for increased safety
- Simple integration: Plug-in design for effortless installation
- Modular & scalable: Expandable according to individual requirements
- Robust housing: Long service life and protection for a wide range of application environments
Efficient energy storage for modern requirements
With a storage capacity of 20.48 kWh, the Deye AI-W5.1-B is ideal for households with high energy demands or commercial enterprises. The powerful 250 A charge/discharge current enables a fast response time to load changes and ensures the availability of stored energy, even for short-term demand.
Flexible & scalable use
The modular design and plug-in system make the Deye AI-W5.1-B particularly easy to install. It can be flexibly integrated into existing solar systems and can be easily expanded as energy needs increase without extensive system modifications.
Robust design for long-lasting use
With a sturdy housing, high-quality workmanship and reliable battery management system, the energy storage system offers protection and performance at the same time. With dimensions of 1422 mm in height and over 230 kg in weight, it is designed for permanent and safe installation.
Who is the Deye AI-W5.1-B 20 kWh battery storage system suitable for?
This storage system is ideal for:
- Homeowners with high energy consumption
- Commercial enterprises with a need for energy management & self-sufficiency
- Installers who rely on modular storage solutions
- System operators focused on optimising self-consumption
| Model | DEYAI-W20.4-B |
| Battery type | LiFePO4 |
| Module capacity (kWh) | 5.12 |
| Module nominal voltage (V) | 51.2 |
| Module capacity (Ah) | 100 |
| System nominal voltage (V) | 51.2 |
| System operating voltage (V) | 44.8-57.6 |
| System capacity (kWh) | 20.48 |
| System usable capacity (kWh) | 18.4 |
| Charge/discharge current (A) - recommendation | 200 |
| Charge/discharge current (A) - nominal value | 250 |
| Charge/discharge current (A) - peak discharge (2 min,25°C) | 360 |
| Operating temperature (°C) | Charge: 0 ~ 55 / Discharge: -20 ~ 60 |
| LCD display | SOC%, Power, Total Voltage |
| Communication interface | CAN2.0, RS485 |
| Humidity | 5% ~ 90% |
| Altitude | ≤2000m |
| Enclosure IP protection class | IP65 |
| Storage temperature (°C) | 0 ~ 35 |
| Dimensions (W/D/H, mm) | 720 * 255 * 1412 |
| Weight (kg) | 233.5 |
| Installation location | Floor mounting |
| Recommended depth of discharge | 90% |
| Cycle life | 25 ± 2°C, 0.5C/0.5C, EOL70% ≥ 6000 |
| Warranty | 10 years |
| Certifications | CE/IEC62619 /VDE2510-50/ UL1973/UL9540A/UN38.3 |
FAQs on the 20 kWh Deye AI-W5.1-B energy storage system
Can the system be expanded to 25–30 kWh at a later date?
Yes, up to six modules are possible per tower, resulting in a maximum capacity of 30.7 kWh per stack. By paralleling up to six towers, the system can be flexibly expanded to a total capacity of over 180 kWh.
How much energy is actually available?
A system with four modules offers 20.48 kWh gross capacity. At a recommended depth of discharge of 90 %, around 18.4 kWh of usable energy is available, ideal for demanding self-consumption and backup applications.
Which inverters are compatible with the “Plug-&-Play” system?
The storage is fully tuned to three-phase Deye hybrid inverters of the SUN-xK-HP3 and SUN-xK-BM series. The connection is made without additional configuration. All relevant communication protocols are integrated at the factory.
Do I need active cooling?
No, the system uses purely passive convection for heat dissipation. According to the manual, only free airflow behind the housing is required to ensure reliable heat dissipation. Fans or external cooling systems are not necessary.
Does the battery need to be fully charged before first use?
Yes, the system should be charged once to 100 % before commissioning. This initial charge ensures that the state of charge (SoC) is correctly recognised and prevents incorrect displays or abrupt SoC jumps during operation.
Scope of delivery Deye AI-W5.1-B Modular battery system (20.48 kWh):
System composition
- This product is a set and consists of five separate main components, which together make a 20.48 kWh tower system.
Component 1: Deye AI-W5.1-B-BMS (control unit & base)
- The central control unit (BMS cluster), which manages the entire system. This unit forms the base of the battery tower.
Components 2, 3, 4 & 5: Four Deye AI-W5.1-BATT battery modules (5.12 kWh each)
- Four pure battery modules each with 5.12 kWh, which are stacked onto the BMS unit and each other.
1 x set of battery connection cables (plus & minus)
- A pair of high performance cables to connect the BMS unit to an external hybrid inverter.
1 x communication cable (CAN/RS485)
- A data cable for communication between the BMS and the inverter.
3 x connection bridge / parallel connection cable
- Short, robust cables or solid bridges to connect the four battery modules with each other.
1 x earthing cable
- A protective earth cable for the proper earthing of the BMS unit.
1 x mounting accessories (tower mounting)
- Includes screws or locking elements to securely connect the five components to a tower.
1 x operating and installation manual
- A printed manual that describes the installation of the entire tower system.
Properties
| Capacity: | 20.48kWh |
|---|---|
| Charging/discharging current: | 250A |
| Tension: | 51,2V |
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