12 Year Warranty ★ Ideal for * Expanding Fox ESS EQ2900 battery stacks * Installations already specifying an EQ2900 master module * Floor-mounted high-voltage battery storage systems * Projects needing 2.88kWh increments ⚡ Works well with * Fox ESS EQ2900-M master battery module * Fox ESS H1-G2 and KH hybrid inverter systems * Fox ESS EQ battery stack accessories * FoxCloud-monitored storage installations Description Specifications Data Sheets Delivery The Fox ESS EQ2900-S is a 2.88kWh high-voltage slave battery module for EQ2900 systems, with a 57.6V nominal module voltage, 52.2V to 65.7V battery voltage range and IP65 floor-mounted storage format. It suits installers expanding an EQ2900 stack that already includes the required EQ2900 master module, rather than buyers looking for a standalone battery. 2.88kWh nominal energy with 50Ah nominal capacity 57.6V nominal module voltage with 52.2V to 65.7V battery voltage range Slave battery module for EQ2900 series stacks CAN communication interface with LED display indication 50A maximum continuous charge and discharge current with 65A peak discharge for 60 seconds 570mm wide x 380mm deep x 155mm high, 31.7kg ±5%, floor-mounted stack format IEC 62619, EN IEC 61000-6-1/2/3/4, UN38.3 and IP65 listed for the EQ2900 system How is EQ2900-S used in a stack? The EQ2900-S is the slave module in the EQ2900 battery system. A working stack requires one EQ2900 master module and at least one slave module, with further slave modules added in series within the permitted system configuration. Fox ESS lists the EQ2900 system as scalable to 20.16kWh. The product page should make the master and slave distinction visible so buyers do not order a slave module as a complete battery system. What does the slave module add? Each EQ2900-S adds 2.88kWh nominal energy to a compatible EQ2900 stack. The module uses the same 57.6V nominal voltage and 50Ah nominal capacity as the matching master module. The master handles the control position in the stack, while the slave modules provide the additional battery layers. This makes the EQ2900-S the correct ordering route for capacity expansion where the master is already present in the specified system. Does EQ2900-S include warming? The current EQ manual lists EQ2900-S and EQ2900-S warming variants separately. The price-list SKU needs checking against the supplied part number if the warming version is required for a specific outdoor or low-temperature design. Fox ESS UK notes that battery warm-up availability varies by model and system configuration. Do not promise warming for this page unless the exact supplied SKU confirms it. Can EQ2900-S be installed without a master? No. The EQ2900-S is a slave module and must be used with the correct EQ2900 master module. The product page should direct standalone battery buyers to a master and slave combination rather than a slave-only purchase. What capacity does one EQ2900-S add? One EQ2900-S adds 2.88kWh nominal energy to a compatible EQ2900 stack. The system can be built up from a master and slave arrangement within the Fox ESS configuration limits. Is the EQ2900-S an IP65 battery? Yes. The EQ2900 datasheet lists IP65 ingress protection for the EQ2900 battery system. The installation location still needs to follow the manual, including temperature, ventilation and mounting conditions. PDF EN EQ2900 Datasheet V1.1 20250416 en eq2900 datasheet v1.1 20250416 451.0 KB No data sheets or downloads available for this product. Loading delivery information... Common installation accessories Solar Inverters Solar panels
