Solax IES-HS50E 5.1kWh Battery Module for X1-IES System

SolaX IES 5.1kWh Battery: The Scalable Lithium Storage Unit for Hybrid & On-Grid Systems

The SolaX IES 5.1kWh battery is a high-performance storage module that gives homeowners and small businesses flexibility, longevity and full compatibility with modern energy setups. Whether you're just getting started with solar or planning for future expansion, this battery makes scaling your storage simple , especially when paired with a SolaX MCS0800E-D BMU or TBMS-MCS0800E for multi-stack configurations.

Modular Power That Grows With Your Needs

Each IES unit delivers 5.1kWh of usable capacity, and you can stack up to 6 modules to create over 30kWh of total storage. If your energy use increases over time, just add another module , no system overhaul required. For even larger systems, integrate a second stack using the SolaX IES Series Box to keep everything in sync.

• Stackable design: up to 6 modules per column
• Expandable to dual-column systems with Series Box
• Built-in BMS functionality and overvoltage protection

Safe, Efficient and Built for British Homes

With lithium iron phosphate (LFP) chemistry and a 6000+ cycle lifespan, the IES range ensures long-term reliability. Its compact footprint and whisper-quiet operation make it ideal for domestic use, garages, utility rooms, or small commercial premises. For colder installations, heater-compatible versions are also available.

• 6000+ cycle life with 90% DOD
• Low maintenance and indoor-friendly form factor
• Heated variants available for extreme climates

Full Integration With SolaX Hybrid Inverters

Designed to work seamlessly with SolaX hybrid inverters, the IES 5.1kWh system supports full energy management , including grid-tied, off-grid, and backup configurations. Using the right BMU, you’ll gain real-time monitoring, fault protection, and solar-to-storage optimisation via the Solax Cloud platform.

Why Evergy Recommends This Product

We recommend the SolaX IES 5.1kWh battery for users who want long-term flexibility with the option to scale up affordably. Combined with the MCS0800E-D or TBMS-MCS0800E and the IES Series Box, this battery becomes the core of a powerful multi-stack system.

• Trusted by solar professionals for hybrid systems
• Proven performance in UK residential and light-commercial settings
• Part of the SolaX energy storage ecosystem

Ideal for Modular Energy Storage Systems

This battery is ideal for homeowners installing a solar system now with plans to grow, or commercial setups with phased installation schedules. It’s also an excellent fit for sites looking to optimise off-peak charging and time-of-use tariffs through smart hybrid inverters.

Technical Specifications

• Capacity: 5.1kWh usable (nominal 5.38kWh)
• Dimensions: 475 × 193 × 755 mm
• Weight: 52.5 kg
• Chemistry: LFP (Lithium Iron Phosphate)

For full details, including electrical ratings and stacking requirements, see the technical tab or datasheet.

Pair With the Right Accessories

Don’t forget to include the correct management unit when configuring your system. Choose the MCS0800E-D for single-stack installs or the TBMS-MCS0800E for dual stacks. If you're going multi-column, you'll also need the IES Series Box to ensure safe balancing and communication between stacks.

Need Help Building the Right Setup?

Visit our full range of solar batteries, hybrid inverters, and battery accessories to explore compatible options. Or contact the Evergy team , we’ll help you design the ideal system for your property and goals.

FAQs

Q: Can I install just one module to start?
A: Yes, the system is designed to operate from a single unit and scale as your storage needs increase.

Q: What’s the difference between the BMUs?
A: The MCS0800E-D is for single-column stacks. If you’re installing more than six batteries across two stacks, you’ll need the TBMS-MCS0800E with the Series Box to manage both stacks safely.