Sync Energy Flow All-in-One Battery Kit 3.6kW + 3 Battery SEF1A36G3

The Sync Energy Flow All-in-One 3 x Battery Kit is a smart, scalable, and installer-friendly energy storage solution designed to simplify modern home energy management. Combining a 3.6kW hybrid inverter with  3 x 5.1kWh LiFePO₄ battery, this modular system is expandable up to 35.84kWh—making it the perfect fit for both new builds and retrofit projects.

Thanks to its stackable, all-in-one design, the system offers quick, neat installation with plug-and-play setup, hidden handles, and adjustable feet. It’s PV-ready, so solar systems can be added at any time, while built-in safety features such as fire suppression, integrated surge protection, and DC/AC isolators provide reliability and peace of mind.

With the Sync Energy app, both installers and homeowners gain full visibility and control over energy usage, storage, and flow. Advanced features like Tariff Sense (real-time tariff insights) and Auto Solar Charging (using only excess solar to charge EVs) ensure energy is used as efficiently as possible.

Designed for long-term performance, the system’s LiFePO₄ battery technology offers up to 6,000 cycles at 90% depth of discharge, ensuring maximum lifespan and value.

Features

• All-in-one stackable system – hybrid inverter + battery storage
• Includes 3 × 5.1kWh LiFePO₄ battery (expandable up to 35.84kWh)
• 3.6kW hybrid inverter with modular scalability
• PV-ready – solar can be added anytime
• Fire suppression system – built-in safety and protection
• Integrated heating below 5°C – reliable year-round performance
• Integrated AC & DC surge protection
• DC/AC isolators + EV/PV support
• LiFePO₄ battery tech – 90% depth of discharge, 6,000 cycles
• Remote monitoring & control via Sync Energy app
• Tariff Sense – real-time tariff & cost-saving insights
• Auto Solar Charging – use only excess solar for EV charging
• Durable outdoor build – IP65 and IK10 rated

Specifications

• Model: SEF1A36G3
• Inverter Power: 3.6kW
• Battery Capacity: 3 x 5.1kWh (expandable to 35.84kWh)
• Battery Type: LiFePO₄
• Cycle Life: 6,000 cycles at 90% DOD
• Dimensions (with 1 battery): H 979 × W 621 × D 245 mm
• Mounting: Stackable all-in-one design
• Monitoring: Sync Energy app (remote control & tariff insights)
• Ratings: IP65 (weatherproof), IK10 (impact resistant)

What are Heavy Goods?

Some of our products are big and bulky like storage heaters and Solar Battery Storage need to travel by pallet rather than by standard courier. Carriage costs are shown at checkout and are charged at the cost price of a pallet on a 48-hour delivery service to most locations. If you live somewhere a little more out of the way, it may take a bit longer due to logistics.

All storage heaters (except mini bathroom models) and Solar Battery Storage weigh over 30kg, which means they fall into our heavy goods category. The delivery cost is calculated based on your postcode and how many pallets are needed for your order. Here’s the good news sometimes you can get more on a pallet for the same price. For example, four heaters may cost the same to deliver as one, if they all fit neatly on a single pallet.

Each pallet can carry up to 500kg and will arrive by lorry. Please note, you’ll be responsible for unloading the pallet on delivery.