The Fox ESS EQ4800-S supplier line EQ4800-Slave is a 4.66kWh high-voltage LFP slave battery module with 44.8V nominal module voltage, 40.6-51.5V module operating range and CAN communication. It suits EQ4800 stack expansion where an EQ4800-M master is already included in the system design.

• 4.66kWh nominal energy with 44.8V nominal module voltage
• 40.6-51.5V battery voltage range with 50A maximum charge and discharge current
• Slave module for use with one EQ4800-M master module
• CAN communication for EQ4800 stack connection
• EQ4800 systems scale from L2 to L9 with up to eight slave modules
• 570mm long x 380mm wide x 172mm high, 39kg slave module
• IP65 and Class I protection listed for the EQ4800 system stack

Can the slave battery work alone?

No. The Fox ESS manual states that each EQ system must have one EQ-M, because the master contains the system controller. The EQ4800-S is a support module and must be ordered against a confirmed master module and inverter configuration.

This is the key difference from the EQ4800-M page. The slave page should answer expansion and module-count questions rather than presenting the unit as a complete battery system.

How far can an EQ4800 stack expand?

The EQ4800 datasheet lists the range from EQ4800-L2 to EQ4800-L9. That gives 9.32kWh at the minimum listed system and 41.93kWh at the maximum listed system.

Fox ESS UK states that each EQ stack consists of one master and additional slave modules. For Fox ESS catalogue clarity, keep the slave page active only where EQ4800-M is also retained.

What must match in the stack?

The slave module must match the EQ4800 stack design, the inverter model and the battery count allowed for that inverter. The EQ4800 documentation lists CAN communication and a 50A maximum charge and discharge current for the module.

Do not mix the EQ4800-S page with EQ2900-S copy. The capacity, dimensions, module voltage and maximum stack size are different.

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