HYXiPOWER All-in-One Expansion Battery 5 kWh – scalable customised energy storage

With the HYXiPOWER 5 kWh expansion battery, you easily expand your existing All-in-One system. Each module contains high-quality, long-life LiFePO₄ cells and internal BMS communication. Thanks to the wireless modular design, you simply connect the battery to the bottom of the system – without loose data cables or configuration.

Key benefits

Plug-&-play extension: stack the module under your current battery and the inverter automatically recognises it.
Wireless internal contact: no data cables between modules – safe, clear and interference-free.
Safe and maintenance-free: LiFePO₄ cells with active temperature management and pressure relief.
Fully compatible: suitable for all HYXi All-in-One models (10 – 25 kWh).
Automatic balancing: each module part contains its own BMS that monitors and aligns the cell voltage.

Installation tip from Radiant Green

Switch off the system completely before installing the extension. Make sure the module rests firmly on the base and click it in place with the supplied mounting kit. Check via the App whether the additional capacity has been recognised and, if necessary, perform a “Battery Auth” according to the manual.

Technical specifications

Nominal capacity: 5 kWh per module
Cell type: LiFePO₄ – automotive grade
Voltage: 51.2 V DC | Rated current: 100 A
Housing: IP67 | Material: stainless steel
Dimensions: 700 × 350 × 200 mm | Weight: ± 44 kg
Compatible with: HYXiPOWER HYX-H6K / H9K / H12K / H15K series

Which HYXiPOWER part do you need?

Are you already using a HYXiPOWER All-in-One system and want to expand, or are you putting together a new set? The comparison below shows exactly what the inverter and expansion battery do, how they work together and in which situation you use them.

Feature	All-in-One Inverter 6-15 kW	Expansion battery 5 kWh
Function	Controls energy conversion, BMS communication, UPS backup and PV control	Adds 5 kWh of additional storage to an existing HYXi system
Application	Replacement or additional inverter module in 10 – 25 kWh sets	Expand storage from 10 → 15 → 20 → 25 kWh or more
Capacity / Power	6 – 15 kW continuous (depending on battery modules)	5 kWh per module (LiFePO₄)
Installation	Place on top of battery stack, connect via GRID & BACKUP connector	Place under existing stack, clicks in wirelessly without cables
Communication	Wi-Fi / 4G / CAN / RS485 / LAN / PLC	Automatic BMS connection, no separate connection required
Security	IP67, AFCI, smoke detection, overvoltage protection, emergency stop	IP67, pressure relief, temperature monitoring, internal BMS
Expandability	Supports up to 5 modules per inverter, later in parallel up to 10 (Q4 2025)	Combine up to 5 modules/inverter, automatically recognised
Dimensions (W×H×D)	700 × 380 × 200 mm \| 46 kg	700 × 350 × 200 mm \| 44 kg
When to choose?	When replacing, new set construction or expanding up to 15 kW output	When you want to add more storage capacity to your existing system

Tip from Radiant Green: always use original HYXiPOWER parts for optimal communication between BMS, UPS function and inverter. This will keep your system safe, efficient and fully expandable.

Datasheet Quick guide Manual Brochure

HYXiPOWER All-in-One Expansion Battery 5kWh