Dyness Tower TS21 – 21.31 kWh HV Home Battery (LiFePO4)

The Dyness Tower TS21 is the largest single-tower variant of the Dyness Tower S3 high-voltage (HV) energy storage system and offers a nominal capacity of 21.31 kWh at a nominal voltage of 576V DC. The system consists of six HV9637S LiFePO4 battery modules and a Tower S3 BMS & Base Unit as the central management unit. With a usable capacity of 20.245 kWh at 95% DOD and a maximum continuous charge/discharge power of 12.78 kW, the Tower TS21 is suitable for residential energy storage with a high power profile, in combination with a compatible HV hybrid inverter. For even larger projects, the system is expandable to a maximum of 255.72 kWh via parallel connection of up to 12 complete towers. 21.31 kWh LiFePO4 high voltage: Nominal voltage 576V DC, usable capacity 20.245 kWh at 95% DOD. 12.78 kW continuous charge/discharge power: Maximum single-tower power capacity for homes with a heat pump, electric vehicle or high simultaneous consumption. Maximum single-tower configuration: 6 modules per tower, the highest capacity within a single Tower S3 system. Plug & Play parallel connection: Up to 12 complete towers connectable in parallel via Daisy Chain for a maximum system capacity of 255.72 kWh, without a secondary master controller. IP54 protection rating: Suitable for installation in technical rooms, garages or sheltered outdoor locations. Wide inverter compatibility: Communication via CAN/RS485 with leading HV inverters including Solis, GoodWe, DEYE, Hoymiles and Kaco. Dyness Tower TS21 — Specifications Specification Value Model Dyness Tower TS21 Battery module type LiFePO4 (HV9637S) Number of modules 6 Nominal energy 21.31 kWh Usable energy 20.245 kWh (95% DOD) Nominal voltage 576V DC Operating voltage 504–648V DC Nominal capacity 37 Ah Max. continuous charge/discharge power 12.78 kW (0.6C) Recommended depth of discharge (DOD) 95% Cycle life ≥6,000 cycles (0.2C, 25°C, 95% DOD, 70% EOL) Communication protocol CAN / RS485 Protection rating IP54 Charging temperature 0–50°C Discharging temperature -10–50°C Dimensions (W × D × H) 504 × 380 × 1520 mm Weight 263 kg System expansion Maximum 12 towers in parallel (Plug & Play) Certifications CE-EMC, CE-RED, IEC62619, IEC62040, IEC62477, IEC63056, UN38.3 Compatible Tower S3 configurations Tower configuration Number of modules Nominal capacity Usable capacity TS7 2 7.10 kWh 6.745 kWh TS10 3 10.66 kWh 10.127 kWh TS14 4 14.21 kWh 13.499 kWh TS17 5 17.76 kWh 16.872 kWh TS21 6 21.31 kWh 20.245 kWh Installation requirements — please read before ordering: Installation must be carried out exclusively by qualified HV installers in accordance with applicable safety regulations. Tower S3 and Tower T-series must not be mixed: Tower S3 components (HV9637S modules and S3 BMS) are not compatible with the older Tower T-series (1.5G, HV9637 modules). Combining or connecting both series in parallel will result in system malfunctions and loss of warranty. Maintain a minimum ventilation clearance of 100 to 200 mm from the back wall and adjacent equipment during installation. Download Datasheet Download User Manual View Comparison Sheet What is included in the package? The Tower TS21 is supplied as a complete system consisting of: 6x Dyness Tower S3 battery module HV9637S (3.55 kWh per module) 1x Dyness Tower S3 SBDU (BMS controller with DC breaker, WAKE button and integrated Wi-Fi) 1x Dyness Tower S3 Base (baseboard with adjustable levelling feet) 1x Red DC power cable (positive, 2m) 1x Black DC power cable (negative, 2m) 1x Inverter communication cable (RJ45, 2m) 1x RJ45-CAN-120 Ohm termination resistor Assembly hardware (screws and OT4-6 grounding terminals) and user manual The BMS & Base Unit and battery modules are also available separately for expanding an existing Tower S3 system to a larger parallel configuration. Which inverters are compatible with the Dyness Tower TS21? The Tower S3 series communicates via CAN/RS485 with a wide range of leading HV inverters, including Solis, GoodWe, Ingeteam, Solplanet, SAJ, DEYE, Hoymiles, SOLINTEG and Kaco. Please consult the user manual or contact us for the most up-to-date compatibility list and the required firmware settings per inverter model. Can I mix Tower S3 components with the older Tower T-series? No. Connecting or mixing Tower S3 components with the older Tower T-series (1.5G) is strictly prohibited. The Tower S3 series uses HV9637S battery modules and a fully redesigned BDU topology that is not compatible with the Tower T-series (HV9637 modules). Combining both series will result in system malfunctions and loss of warranty. Please refer to the comparison sheet for a full overview of the differences between both series. Can I expand the Tower TS21 to an even larger system capacity? The Tower TS21 is the maximum single-tower configuration of the Tower S3 series with 6 modules per tower. Further expansion within a single tower is not possible. For larger projects, up to 12 complete TS21 towers can be connected in parallel via Daisy Chain for a maximum system capacity of 255.72 kWh. Always verify the maximum configuration of the connected inverter and the required parallel connection accessories before expanding. Why does the Dyness Tower TS21 become more attractive as solar export rates decline? As solar feed-in tariffs continue to decline across Europe and time-of-use energy pricing becomes more widespread, storing self-generated solar energy locally is becoming increasingly financially relevant. The Dyness Tower TS21 enables you to use solar energy generated during the day in the evening and at night, reducing low-value grid exports and maximising self-consumption at the full retail electricity price. With a usable capacity of 20.245 kWh and a continuous power of 12.78 kW, the Tower TS21 is particularly well suited for homes with a high daily consumption, a heat pump, an electric vehicle or multiple high-demand appliances, where ample capacity must remain available throughout the night. The actual financial benefit depends on your consumption profile, PV yield, energy contract and applicable feed-in tariffs. View more products in our Dyness home battery collection.