Felicity FLS48100SG2 Modular Home Battery 5.12-40.96 kWh

The Felicity FLS48100SG2 is a stackable low-voltage home battery for residential properties, small businesses, and off-grid applications where flexibility, safety, and expandability are key. This system is built around 51.2V 100Ah LiFePO4 battery modules and is used in practice as a scalable storage solution from 5.12 kWh up to a maximum of 40.96 kWh.

Thanks to its modular design, you can start small and expand later as your energy usage, solar installation, or backup power requirements grow. The FLS48100SG2 combines a smart BMS, built-in WiFi, RS485/CAN communication, floor-standing installation, and an integrated aerosol fire suppression system in one sleek and modern setup that is especially attractive for customers who want more than a simple standalone battery.

For Off Grid Supply, this is an interesting product for customers looking for a 48V energy storage system that pairs well with hybrid inverters, is ready for future expansion, and is suitable for daily use, high cycle life, and reliable backup power.

5.12-40.96 kWh

Modular capacity from a compact base configuration to a serious home battery for daily use.

51.2V 100Ah modules

Built on low-voltage LiFePO4 modules that are well suited for 48V hybrid energy storage systems.

6000+ cycles

Designed for long-term use with deep discharge capability and a long technical lifespan.

Smart and safe

With smart BMS, fuse, breaker, WiFi monitoring, and integrated aerosol fire suppression.

Overview of key advantages

• Built around 51.2V 100Ah LiFePO4 modules
• Scalable from 5.12 kWh to 40.96 kWh
• High usable storage thanks to a minimum DoD of 95%
• More than 6000 charge cycles to 80% remaining capacity
• Built-in WiFi for remote monitoring
• RS485 / CAN communication for connection with inverters and energy management systems
• Smart BMS, breaker, and fuse built in
• Integrated aerosol fire suppression system
• Floor-standing design with a clean, modular structure
• Broad compatibility with leading inverter brands

Detailed product explanation

The FLS48100SG2 is not a simple standalone battery, but a modular stack system designed for structural energy storage. Each module uses LiFePO4 chemistry and is intended for daily charging and discharging in combination with a suitable 48V hybrid system. Thanks to the stackable architecture, the installation remains neat and organized while the capacity can later be increased without replacing the entire system.

This makes the model suitable for customers who want to make better use of their own solar power, reduce peak demand, or use more of their stored energy in the evening and at night. It is also interesting for situations where a reliable reserve is desired in the event of grid outages or unstable grid voltage, in combination with a suitable hybrid inverter.

The combination of smart protection, WiFi monitoring, floor-standing installation, and an integrated fire suppression system also gives this product a more professional appearance than many simple 48V battery blocks.

How the product works

The Felicity FLS48100SG2 stores energy that is charged through a compatible hybrid inverter from solar panels or the electricity grid. When power is needed, the battery pack delivers that energy back into the system. In a normal home, this often means charging during the day and discharging in the evening or at night.

When the system is combined with an inverter that supports backup or EPS, the battery can also play an important role in backup power. The battery itself manages charge and discharge protection, temperature monitoring, and communication via the built-in BMS.

Because the storage is modular, you can start with a smaller number of modules and add extra capacity later as your consumption or solar production grows.

Who is this product suitable for?

• Households that want to increase self-consumption of solar energy
• Users looking for a 48V low-voltage solution
• Customers who value expandability instead of a fixed rigid system
• Installations where communication with hybrid inverters via RS485 or CAN is desired
• Users looking for extra safety through smart BMS and integrated fire suppression
• Residential and small commercial applications where floor-standing installation is practical

When is the FLS48100SG2 less suitable?

This system is less suitable if you are specifically looking for a very compact wall-mounted battery or if you need a fully outdoor-rated solution. The FLS48100SG2 is a floor-standing system with IP21 protection and is therefore intended for dry indoor environments or technical rooms.

For customers who only want a small entry-level battery without future expansion plans, simpler models may be more logical. The strength of this model lies in scalability, system design, and long-term use.

Practical benefits in daily use

In practice, the FLS48100SG2 is mainly about flexibility and clarity. The system looks neat in a technical room, garage, or utility room and is easier to scale than many loose battery blocks with external cabling. That makes it attractive for users who want not only performance, but also a clean and logical installation.

The combination of smart protection, communication, and monitoring also contributes to ease of use. Especially when the battery is used daily to store solar power and release it again in the evening, you want to be able to rely on stable communication with the inverter and a clear system status.

For users who take energy storage seriously and want the option to expand later, this Felicity solution feels much more like a real system than a loose standalone battery.

Why choose Off Grid Supply?

Off Grid Supply looks not only at battery capacity, but at the full application. That means you do not just get a product description, but targeted advice on which configuration makes sense for your consumption, your solar installation, your inverter, and your expansion plans.

This is important with the FLS48100SG2, because the system is modular and can be used meaningfully in multiple capacity variants. The right choice depends on your peak demand, your annual yield, your backup power needs, and the extent to which you want to expand later.

That combination of product knowledge, system thinking, and relevant hybrid solutions makes Off Grid Supply a logical partner for customized energy storage.