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The Fox ESS EQ4800 Slave Battery Module is a high-performance 4.66kWh lithium iron phosphate (LiFePO₄) expansion battery designed to seamlessly scale Fox ESS EQ high-voltage battery systems. Built for reliability, efficiency, and easy installation, this slave module allows homeowners and businesses to increase energy storage capacity as their needs grow.
This module operates as part of a modular stack and must be paired with a compatible EQ4800 Master module to function.
Expandable Modular Design
Each EQ4800 Slave Module adds 4.66kWh of usable energy, allowing systems to scale up to 41.93kWh by stacking multiple modules in series.
100% Depth of Discharge (DoD)
Use the full capacity of the battery without compromising lifespan, maximising return on investment.
High-Voltage Architecture
Designed for high-voltage battery systems, improving efficiency, reducing current losses, and enabling better inverter performance.
Safe & Long-Life LiFePO₄ Chemistry
Lithium iron phosphate technology offers superior thermal stability, long cycle life, and enhanced safety compared to conventional lithium batteries.
Plug-and-Play Installation
The modular, stackable design enables fast installation, saving labour time for installers and allowing future upgrades without system redesign.
Indoor & Outdoor Rated (IP65)
Suitable for both indoor and outdoor installations with robust weather protection.
Battery Type: Lithium Iron Phosphate (LiFePO₄)
Nominal Energy: 4.66kWh
Usable Capacity: 4.66kWh
Depth of Discharge: 100%
Communication: CAN
Round-Trip Efficiency: >95%
Cooling: Natural convection
Ingress Protection: IP65
Operating Temperature:
Charge: 0°C to 55°C
Discharge: -10°C to 55°C
Installation: Indoor / Outdoor (Stand mounting)
Scalability: Up to 9 modules in series (41.93kWh)
Warranty: 10 years (manufacturer standard)
Designed exclusively for Fox ESS EQ4800 High-Voltage Battery Systems
Requires EQ4800 Master Module (slave module cannot operate independently)
Compatible with supported Fox ESS hybrid and battery inverters
Residential solar and battery systems
Energy storage upgrades and staged installations
Homeowners planning future capacity expansion
Installers seeking fast, modular battery solutions
If you want a safe, scalable, and future-proof battery expansion solution, the EQ4800 Slave Module delivers outstanding flexibility with premium build quality. Add storage as your energy needs grow—without replacing your existing system.
Upgrade your Fox ESS battery system today with the EQ4800 Slave Module and unlock scalable, high-voltage energy storage.
All our products are covered by the Manufacturer's Warranty, which guarantees that they will be free from defects in materials and workmanship under normal use and service. The specific terms and duration of the warranty may vary depending on the product and the manufacturer. Please refer to the product's documentation or contact our customer support team for detailed warranty information.
Warranty Claim Process
In the unfortunate event that you encounter a faulty product, we want to make the warranty claim process as seamless as possible for you. To initiate a warranty claim, please follow these steps:
If damage is confirmed to be from normal wear-and-tear, drops, unauthorized repairs, or other non-warranty factors, service and shipping fees will apply. In such cases, we will contact the customer for approval before proceeding with paid repairs.
Unfortunately we cannot provide loaner units during the warranty repair process. For mission-critical equipment, we highly recommend purchasing backup units to prevent downtime in case of defects.
You have 30 calendar days to return an item from the date you received it.
To be eligible for a return:
Upon receiving your order, we kindly request that you thoroughly inspect all packages within 7 days of delivery. This inspection period is crucial as it allows you ample time to identify any visible damage caused during transit. Please keep in mind that promptly reporting any freight damage is vital in safeguarding your right to file a claim and ensuring a swift resolution.
Should you identify any freight damage during the inspection, we urge you to notify us immediately. Our customer support team is ready to assist you through the claim filing process and provide the necessary guidance to ensure a smooth and hassle-free experience.
The advertised price for this product includes the applicable STC battery rebate, applied as a pre-discount at the time of purchase.
To be eligible for the battery rebate:
Supply-only purchases are not eligible for the battery rebate.
By proceeding with this purchase, the customer agrees to assign all eligible Small-scale Technology Certificates (STCs) associated with the battery installation to Solar Battery Supermarket (or its nominated agent).
This assignment allows the rebate to be applied as a point-of-sale discount.
If the customer does not agree to assign the STCs, the full non-rebated price of the battery system will apply.
Installation by a licensed and accredited installer is mandatory to qualify for the rebate-adjusted price.
Standard metro installation is available from $500, subject to property assessment.
Additional works (including switchboard upgrades, long cable runs, or non-standard installations) may incur extra charges and will be quoted and approved prior to installation.
To assess eligibility and proceed with installation, the customer may be required to provide:
Failure to provide required information may delay installation or affect rebate eligibility.
This rebate offer does not limit your rights under Australian Consumer Law.