V-TAC OHS25K-100 25.6kWh HV battery tower25.6kWh 256V LiFePO4 tower: 5× OH-5K, OHS-HV100, base

Overview

The OHS25K-100 (V-TAC SKU 120025) is a complete OHS high-voltage tower: OH-Base, 5 OH-5K modules in series and the OHS-HV100 control box with cables. It provides 25.6kWh nominal and 20.48kWh usable at 256V, with 40A recommended and 50A maximum current. The stack measures 590×1000×420mm and weighs about 252.6kg. Its voltage sits within the 160–700V battery window of Deye SG01HP3 three-phase hybrids, which are listed with the OH-5K in Deye's CEI 0-21 declaration.

• 5.12kWh, 51.2V OH-5K modules in series
• Towers of 4–8 modules: 204.8–409.6V, 20.48–40.96kWh
• OHS-HV100 control box, 120–750V, 50A max
• IP65 modules and control box, 590×420mm footprint
• CEI 0-21 with Deye SG01HP3 inverters, 4–48 modules
• IEC 62619 certified by TÜV SÜD

How it works

An OHS tower stands on the OH-Base, carries a chosen number of OH-5K battery modules connected in series and is topped by the OHS-HV100 high-voltage control box. Each OH-5K adds 5.12kWh and 51.2V, so four modules give 204.8V and 20.48kWh and eight give 409.6V and 40.96kWh. The control box holds the BMS, an air switch, the BMS on/off button, a display, Wi-Fi and the DC and communication ports to the inverter.

V-TAC recommends 40A charge and discharge current, with 50A maximum, and quotes usable energy at 80% depth of discharge, for example 16.38kWh for a four-module tower. The system is rated for at least 6,000 cycles at 25°C and 0.5C to 70% end-of-life capacity. V-TAC's datasheet allows up to 10 modules in series and six towers in parallel.

Installation

Modules, base and control box are stacked and fixed with side screws; supplied items include the 2m positive and negative leads to the inverter, communication cables, an earthing lead, a 120Ω terminal resistor and waterproof RJ45 connectors. The manual specifies charging at 0–45°C, discharging at -10 to +55°C, 5–85% humidity, altitude up to 2,000m, a level floor, a site out of direct sun and wind and away from salt air, and a dry-powder extinguisher nearby. Installation is for trained electricians only.

Compatibility and settings

The battery communicates with the inverter over CAN. Deye's CEI 0-21 declaration for its SG01HP3 three-phase HV hybrids (SUN-5K to SUN-25K-SG01HP3-EU-AM2) lists the OH-5K with four to 48 modules. With inverters that cannot communicate with the battery, the manual gives fixed settings: maximum charge voltage 56.0V × N modules, cut-off 49.0V × N at 20% SOC, restart 51.2V × N and 50A charge and discharge.

Monitoring

The control box display shows SOC, system voltage, current, minimum and maximum cell voltages and temperatures, relay and heating status, insulation resistance and fault codes. Through Bluetooth and Wi-Fi the Xiaodan Energy Storage app for Android and iOS shows charge and discharge data, sends alarms and installs software updates.

Questions and answers