12V/24V 30A MPPT Solar Charge Controller

WattLINK is compatible with EcoFlow Delta 2, Delta 2 Max, Delta 3, Delta 3 Plus and  Wave 3 units equipped with an XT150 expansion port. It is not compatible with the EcoFlow River series and Delta Pro series or any station without a dedicated expansion port. Always verify your model before purchase.

Yes. WattLINK supports fully bidirectional 50A current flow. Energy moves from the WattCycle battery into the station when the station needs charging, and from the station outward when powering loads. Both directions operate through the same single cable connection.

If the voltage differential between the two devices is too large at the moment of connection, your power station's native internal protection will automatically pause the link. This is normal protective behavior. Allow both devices to reach a closer state of charge and reconnect. Nothing is damaged in this process. For the smoothest experience, we recommend ensuring your EF PPS and the WattCycle 48V LiFePO4 battery are at the same or a very similar state of charge before connecting. Ideally both units should be fully charged prior to the first connection, to avoid triggering the protection circuit altogether.

No. WattLINK is an independent third-party product designed and manufactured by WattCycle. It is not manufactured, endorsed, or authorized by EcoFlow. Compatibility is based on port geometry and electrical specifications.

WattLINK is rated for a maximum continuous current of 50A at 48V, supporting up to approximately 2,400W of continuous power transfer. The hardware is rated to withstand up to 150A, ensuring that real-world operating loads of 20–30A remain well within a completely safe and stable range.

WattLINK is designed and tested exclusively for use with WattCycle 48V LiFePO4 batteries on the M8 terminal end. Use with batteries of a different brand, voltage, or chemistry is outside the scope of this product's design and warranty coverage. Always use a matched, compatible battery system.

Yes. The XT150 expansion port on EcoFlow Delta 2 and Delta 3 series stations is rated to accept up to approximately 2,000W of input when connected via a proper high-current expansion cable. WattLINK's 8AWG construction and 50A rating are built to deliver exactly that — the full capacity the port was designed for. A standard XT60 solar input cable cannot achieve this through the expansion port. WattLINK connects through the dedicated expansion port and allows you to reach the station's maximum rated input through that channel.

WattLINK is built with safety headroom at every level. The 8AWG copper copper wire is capable of handling currents of up to 150A, while this extra battery cable operates at a maximum of 50A. Furthermore, the housing is constructed from high-temperature-resistant materials capable of withstanding 200°C, well beyond anything this system will encounter in normal use. As long as polarity is correctly verified and voltages are matched before connection, the risk of heat-related issues is negligible under normal operating conditions. If you want to know the detailed information, please read the blog: "Is It Safe to Connect the WattCycle Battery to the EcoFlow via a WattLINK Expansion Cable?"

A: Rest assured, it's fully protected. Watt Cycle has rigorously tested this setup in our lab. The Watt Cycle expansion cable fuse protects at approximately 50A. At the same time, EcoFlow's built-in safety relay automatically detects voltage differentials and intervenes when the gap is too large. You get industrial-grade capacity with factory-grade safety.

A: No — it simply triggers a smart protective pause. If the battery drops to 0%, its voltage naturally falls. If the voltage difference between the server battery and your Delta 2/3 exceeds 1V–1.5V, EcoFlow will display a red warning light and stop cross-charging/discharging to prevent a power surge.

A: No programming needed — just simple voltage matching. Watt Cycle's 51.2V 100Ah battery and your portable power station each manage their own SOC (State of Charge) independently. Just match the voltage before connecting for smooth operation. If a significant voltage gap is detected, the built-in protection will pause the connection until the voltages naturally sync up.

A: Actually, you can have the best of both worlds! You can install the bulky Watt Cycle server rack battery as a fixed base in your RV, garage, or van, while your EcoFlow Delta 2/3 stays quick-release and portable. Leave the heavy backup battery in place for continuous power, and simply unplug your EcoFlow to take it anywhere.

A: Massive capacity at a fraction of the price. Official expansion options can cost thousands of dollars for limited capacity. With the Watt Cycle server rack battery and our plug-and-play XT150 cable, you can unlock a reliable, safe 6kWh to 11kWh+ of home/RV backup power for just $999 — breaking free of brand ecosystem lock-in at a price that actually makes sense.

A: Yes. All you need is a plug-and-play cable and a standard 48V server rack battery.

✅ No soldering or programming required
✅ Safe, balanced dual-battery system
✅ Full 6kWh–11kWh power for under $1,000