Dyness Tower S3 TS2121.31kWh 576V high-voltage LFP battery tower with 6 modules

Overview

The Tower S3 TS21 is the largest single tower in the range: six HV9637S modules, the SBDU controller and the base, for 21.31kWh at 576V nominal and 20.245kWh usable at 95% depth of discharge. It operates from 504V to 648V and, with inverter communication, charges and discharges at up to 22.5A, about 12.78kW. Height is 1,520mm, footprint 504×380mm and weight 263kg. Six-module towers need an inverter that accepts this voltage; the Dyness list approves the TS-21 for models such as Deye SUN-5K~25K-SG01HP3-EU-AM2, Solis S6-EH3P(12-20)K-H and GoodWe GW15~30K-ET.

• HV9637S modules: 96V, 37Ah, 3.552kWh each
• 2 to 6 modules per tower, 192V to 576V
• 7.10–21.31kWh nominal, 95% recommended depth of discharge
• Up to 12 towers in parallel
• IP54 modules and controller, CAN/RS485 to the inverter
• Built-in Wi-Fi on the SBDU controller

How it works

Tower S3 is a floor-standing high-voltage battery made of a base, two to six HV9637S lithium iron phosphate modules and a battery disconnect unit (SBDU) on top. Each module holds 30 cells in series, so it adds 96V and 3.552kWh to the string. The five standard towers, TS7, TS10, TS14, TS17 and TS21, therefore run at 192V to 576V nominal and store 7.10kWh to 21.31kWh, of which 95% is the recommended usable share.

Modules connect to each other through composite plug-and-socket connectors that carry both power and the internal bus, so no power cables run between modules. The SBDU holds the DC breaker, the WAKE button, the RJ45 CAN/RS485 port for the inverter, two parallel ports and a Wi-Fi antenna.

Key features

Every tower shares the same current ratings: charge and discharge at 18.5A in normal operation, 22.5A maximum when the battery communicates with the inverter, and a 37A discharge limit. In practice this gives 4.2kW of charge and discharge power on a TS7 and 12.78kW on a TS21. The BMS protects against over-charge, over-discharge, over-current and temperature faults and balances the cells. Charging is allowed from 0°C to +50°C and discharging from -10°C to +50°C.

Installation and compatibility

Dyness asks for 100–200mm of free space around the tower, a firm base, earthing below 1Ω and a location away from direct sun, rain and snow. Power leads are 6mm² and 2m long; if they must be longer, use the same cross-section up to 3m. Dyness recommends a two-pole DC breaker between the SBDU and the inverter. Tower S3 must never be mixed with the older Tower series, either in series or in parallel.

Up to 12 towers of the same model and capacity can be paralleled, provided their voltages are within 20V, all are fully charged and a new tower is added within six months. Dyness publishes a Tower S3 compatibility list that includes GoodWe ET, Solis S6-EH3P, Deye SG01HP3, Hoymiles HYT, SAJ H2, KACO blueplanet hybrid and Sunways STH models, with the tower sizes approved for each.

Monitoring and settings

The tower reports to the inverter over CAN or RS485 through one RJ45 cable, and the WAKE button LED shows whether the link is working: steady green means battery and inverter are communicating, flashing green means the battery is healthy but the link has failed. The controller also carries a Wi-Fi module for monitoring. Dyness recommends a full charge at least every three months to rebalance the cells and calibrate the state of charge.

Questions and answers