
Energy Storage Systems
Sara Incorporated in cooperation with Danfoss
Danfoss Industries and Sara Incorporated commissioned a 270 Kw/Hr Battery Energy Storage System, S-Grid, at Danfoss’s India Plant to provide system flexibility while charging it from the 1.2 MW Solar plant installed on the premises.
Danfoss Industries Pvt Ltd. (Subsidiary of the 7 Billion Euros in sales Danfoss Group with its HQ in Denmark) and Sara Incorporated, inaugurated India’s first privately owned and managed grid-scale battery-based energy storage system, S-Grid, in Oragadam, Chennai. The 270 kilowatt-hours (KWh) system, designed and commissioned by Sara Incorporated, will pave the path for the wider adoption of grid-scale energy storage technology across India.
Battery-based energy storage enables electricity to be stored and then delivered within milliseconds, reducing the instability of the electric grid and enabling more energy to be captured and delivered on-demand. India has the ambitious vision of installing 250 GW of renewable energy generation by 2025.
Battery-based energy storage provides the flexibility and agility to better integrate intermittent solar and wind energy resources into India’s electric grid and ensure high-quality power for consumers.
S-Grid, a 270 KW/Hr project, is located at Oragadam, Chennai, and will be charged by the 1.2 MW Solar Plant at Danfoss’s facility. This system is part of the journey at Danfoss to become carbon-free by 2030. Danfoss also proposes to add a charging station to this system to enable a fully green vehicle with no fossil fuel requirement for charging.
Capacity | |
Cell Technology | LiFePO4 |
Nominal Cell Voltage | 3.2 |
Nominal Battery Voltage/Min/Max | 880/920/1000V |
Installed Capacity | 270kWh (288 x 100S3P) |
Usable Energy at 80% DOD | 215 kWh |
Usable Energy at 75% DOD | 200 kWh |
Power Delivery & Charging | |
Nominal/Max discharging Current (0.5C/1C) | 135/270A (Fuse protection at 400A) |
Max Charging Current (0.5C) | 135A (Two-hour Charge rate) |
Expected Cycles @ 70D0D @1C | >4000 Cycles (.5C Charge and Discharge) |
Expected Cycles @ 80DOD @1C | >3000 Cycles (.5C Charge and Discharge) |
Efficiency @ C1 | +-90% |
Temperature | Charge -25°C-55°C Discharge -20°C-65°C |
Battery Management System (BMS) | |
Digital Battery Management System | Master-Slave topology |
CMS (Cell Management System) | 12 LiFeP04 per CMU (24xCMU Modules) |
Communications | Can Bus diagnostics interface |
ISOSPI Bus internal comms | |
CAN bus 2.0 A&B | |
MCU - Isolated Power Supply | 6-35V Power from the main pack - No ups needed |
MCU Power Consumption | <3.2W @ 12V <20mW @ 12C in sleep mode |
CMU- Power Supply | Minimum 3 Cells 6-40V |
CMU- Power Consumption | <0.6W for 12cells (operating) <0.3mW (sleep mode) |
Temperature Measurements | Cell-Level and CMU level (Total of 288) |
Protection | 120 + Error messages |
Dimensions | BESS Module |
Width | 2200 mm |
Depth | 530 mm |
Height | 22300 mm |
Weight (without Cells) | 300 kg |
Weight (with Cells) | 2000 kg |
EMS & Control | Siemens S7 1200 |
User Communications | Can-BUS(Isolated & non Isolated) Profi Bus, RS232 |
TCP/IP: Modbus - Profi Net |