• Dyness Tower T21 front
  • Dyness T-21
  • Dyness-Tower-exploded
1 3

Dyness Tower T21 – 21.31 kWh HV Home Battery (LiFePO4)

€4.260,41 incl. 21% VAT
Shipping calculated at checkout.
In Stock
Freight prepaid delivery (NL/BE) from €5,000 order value
Delivery within 3–7 business days (NL/BE)
Direct technical support
More than 20 years of hands-on experience in PV & energy storage
Net discount conditions for registered partners
Professional access
  • Generic
  • Apple Pay
  • Bancontact
  • Google Pay
  • iDEAL Wero
  • Klarna
  • Maestro
  • Mastercard
  • MobilePay
  • PayPal
  • Visa

The Dyness Tower T21 is the most powerful configuration in the Tower series — a premium 21.31 kWh high-voltage home battery (576V) engineered for maximum energy independence and large-scale residential or light-commercial applications. With a 576V DC high-voltage architecture, the system operates at lower current levels, significantly reducing internal resistance losses and maximizing overall system efficiency.

Built from 6 stackable HV9637 modules + 1 BDU, the T21 delivers exceptional energy density within a compact footprint. The robust IP54 enclosure enables installation in technical rooms, garages, or sheltered outdoor environments — ideal for advanced self-consumption, peak shaving, and extended backup power strategies.

  • Maximum Capacity: 21.31 kWh in a single tower system.
  • 576V High Voltage: Lower losses, superior efficiency.
  • IP54 Protection: Indoor & sheltered outdoor installation.
  • Cable-Free Stacking: Fast, secure plug & play assembly.

The Ultimate High-Voltage Energy Storage Platform

  • Maximum Efficiency: 576V optimizes performance with modern HV hybrid inverters while minimizing conversion losses.
  • Enterprise Plug & Play: Modular architecture eliminates internal inter-module cabling.
  • Scalable Architecture: Multiple Tower systems can operate in parallel (Master/Slave configuration) for large-scale storage expansion.
  • Proven Safety: Premium LiFePO4 cells with intelligent BMS monitoring and over 6000 life cycles.
Installation Notice: This is a 576V DC high-voltage system. Installation must be carried out by a certified professional in accordance with local electrical regulations. Ensure your inverter supports the voltage range 504V – 657V.

Technical Specifications

SpecificationValue
ModelDyness Tower T21
Nominal Capacity21.31 kWh
Battery TechnologyLiFePO4 (Lithium Iron Phosphate)
Nominal Voltage576V DC
Configuration6x HV9637 Module + 1x BDU
Voltage Range504V – 657V
Protection RatingIP54
Dimensions504 × 380 × 1500 mm
Weight269 kg
CertificationsCE, UN38.3, IEC62619
Datasheet Download Manual Download
What is included with the Dyness Tower T21?
The complete T21 package includes one BDU box (Item A) containing the Tower BDU, 2m inverter communication cable, positive and negative power cables (2m), DC connectors (+/-), BDU communication connector, mounting hardware, user manual and warranty card. Additionally, six battery boxes (Item B) are supplied, each containing one HV9637 battery module (96V/37Ah) with fastening components — a total of 6 modules.
Which inverters are compatible with the Tower T21?
The Tower T21 is designed for high-voltage hybrid inverters from manufacturers such as GoodWe, Solis, SAJ and Ingeteam. Always consult the official compatibility list and verify that your inverter supports the voltage range 504V–657V.
Can the storage capacity be expanded further?
Within a single tower, T21 represents the maximum configuration (6 modules). For additional capacity, multiple Tower systems can be connected in parallel using a Master/Slave configuration to scale total storage capacity.
Is indoor installation safe?
Yes. The combination of thermally stable LiFePO4 chemistry and IP54 protection allows safe installation in technical rooms, garages or sheltered outdoor environments when installed by a certified professional.

Explore our complete Dyness home batteries .

Activate your installer account

Verify your company within 12 hours and gain immediate access to professional net pricing, engineering support and live EU inventory.

Register Access Partner Portal
Fast-Track Authorization: Manual business verification and activation within 12 hours.
Professional Net Pricing: Direct purchasing rates for Aiko, Jinko, BYD, Solis and more.
Technical Authority: Senior engineering support with 20+ years of PV and storage expertise.
View full details
Dyness Tower T21 – 21.31 kWh HV Home Battery (LiFePO4) – General installation or product video