Build an advanced solar power solution with the Fox EQ4000 modular solar power battery, a premium high-voltage lithium energy storage module engineered for full compatibility with all Fox ESS AIO (All-in-One) inverter platforms — Flex, Hub, and Non-Hub systems. Designed with advanced LFP (Lithium Iron Phosphate) technology and a scalable modular architecture, the Fox EQ4000 4kWh battery delivers exceptional performance, safety, and long-term reliability across residential, commercial, and off-grid applications.
Whether you are powering a home, upgrading an RV solar system, building a remote cabin, or adding backup capacity to a marine or off-grid installation, the Fox EQ4000 solar battery integrates seamlessly with any Fox AIO configuration, providing dependable, future-proof energy storage.
Product Overview
The Fox EQ4000 lithium battery is part of the high-performance Fox AIO PowerQ ecosystem, supporting plug-and-play integration with Flex, Hub-based, and Non-Hub Fox AIO inverters. The EQ4000 operates as a true hybrid module, allowing seamless stacking and expansion across all AIO systems for maximum flexibility and long-term scalability.
Each EQ4000 module delivers 3.97 kWh of usable energy and supports expandable configurations up to 27.80 kWh, making it ideal for both small residential systems and larger backup or off-grid installations. With 90% depth of discharge (DoD), >95% round-trip efficiency, and a wide operating temperature range, the Fox EQ4000 ensures reliable, high-performance energy storage in diverse climates and operating conditions.
When paired with any Fox AIO inverter (Flex, Hub, or Non-Hub), the EQ4000 supports intelligent energy management, fast installation, and safe indoor or outdoor deployment.
Key Features
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4kWh high-voltage LFP battery module for all Fox AIO inverters (Flex, Hub, and Non-Hub)
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Scalable architecture – expand up to 27.80 kWh
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Advanced lithium iron phosphate (LFP) chemistry for safety and long cycle life
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90% Depth of Discharge and >95% round-trip efficiency
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Wide operating temperature range for harsh environments
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CAN communication for seamless inverter integration
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IP65-rated enclosure for indoor and outdoor installation
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True plug-and-play modular design
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Certified to UL1973, UL9540, UL9540A, and UN38.3 safety standards