97-218-00035-00 Fox ESS - Standalone Battery Module CS4000 (Slave)

Fox ESS Standalone Battery Module CS4000 (Slave)

The Fox ESS CS4000 is a slave battery expansion module for Fox ESS standalone energy storage systems. Providing 4kWh of additional lithium battery capacity, it connects to a CM4000 master module to expand total system storage. Multiple CS4000 slave modules can be stacked to achieve the desired system capacity, making it easy to scale energy storage as needs grow.

Key Features

• 4kWh lithium battery capacity — scalable expansion for Fox ESS standalone systems
• Slave module — connects to CM4000 master module to expand capacity
• Stackable — add multiple CS4000 modules for higher total capacity
• Integrated BMS — built-in battery management system for safety and longevity
• Compatible with Fox ESS ecosystem — designed for use with CM4000 master module

Specifications

• Capacity: 4kWh
• Module type: Slave (CS)
• Chemistry: Lithium
• Compatible with: Fox ESS CM4000 master module

Ideal For

• Expanding existing Fox ESS CM4000 battery systems
• Residential solar + storage installations requiring more capacity
• Homeowners scaling energy storage over time
• Fox ESS standalone battery system builds

Ships from Thunder Battery — Canada's trusted energy storage dealer.