Maximum Solar Utilisation, Maximum Savings
2300W Output for Peak Demand Moments
The EcoFlow STREAM Ultra X provides a leading 2300W AC output, letting you power high-demand appliances through its AC socket using solar energy stored in the battery.
2300W Output for Peak Demand Moments
When you connect two units in parallel, you can boost the output to 2300W, allowing you to power heavy-duty appliances 100% with solar energy.
Sunset to Sunrise Power: From 3.84kWh to 23kW
EcoFlow STREAM Ultra X goes beyond industry standards, capturing surplus solar energy during the day to keep you powered through the night — and it scales easily to fit your energy needs.
2 Ways to Scale for Different Needs
Dual Units in Parallel
Connect two STREAM Series units, or pair a STREAM Ultra X with any STREAM Extra Batteries using a Parallel Cable. This setup lets you run heavy-duty appliances up to 2300W, all powered by solar energy.
2 Ways to Scale for Different Needs
Plug-and-Play Decentralised Solar Network
With multiple STREAM products, you can place one near your solar panels and the others anywhere in your home. Once the batteries are plugged into AC sockets, they automatically form a solar network, distributing energy to your devices in the laundry, kitchen, living room, and beyond.
Capture Every Ray, Maximise Sunlight
Harness the sun's power faster than ever. With four advanced MPPTs and a massive 2000W solar input, the STREAM Battery captures and stores more solar energy, more efficiently.
Don't Let Clouds or Dusk Limit Your Solar Power
The STREAM Battery uses advanced low-light technology to capture energy from even muted skies, delivering up to one extra hour of solar harvest each day compared to industry averages.
Safety You Can Trust
Built into Both Hardware & Software
Ready For Any Weather
AI-Driven Energy, Always Optimised
EcoFlow OASIS doesn’t just answer your energy management questions quickly—it also provides smart analysis and tailored optimisation tips to help you get the most from your system.
Total EcoFlow Energy Ecosystem Harmony
Compatible with EcoFlow Smart Meter and Smart Plug
Take full control with EcoFlow Smart Meters or Smart Plugs to ensure no power goes to waste. When you connect an EcoFlow Smart Meter with the STREAM Series, they communicate directly, even offline. This allows the STREAM Series to automatically adjust its output to your home grid in real time, with minimal delay.
Cross-Brand Ecosystem Harmony
EcoFlow OASIS brings together third-party devices that use Tiber, Matter, and Shelly protocols, all on one unified platform. Enjoy a simpler, more intuitive experience without the hassle of switching between multiple platforms and apps.
How to Install
Explore STREAM Ultra X Details
EcoFlow STREAM Ultra X
EcoFlow STREAM Ultra
EcoFlow STREAM Pro
EcoFlow STREAM Max
What's in the box - STREAM Ultra X
STREAM Ultra X × 800W
STREAM Solar Panel Extension Cable (2.95m) × 8
STREAM AC Cable (1.5m) × 1
PV Wrench × 1
Mounting Bracket × 1
Locking Bracket × 1
Safety Instructions × 1
Installation Guide × 1
Warranty Card × 1
Specs - EcoFlow STREAM Ultra X
Capacity
3,84kWh
Cycle Life
6000 cycles to 70% capacity
AC Charging Input
1200W
AC Output
1200W
MPPT
4
PV Input Power
2000W (500W*4)
PV Input Voltage
Maximum 60V DC
AC Output-Grid Tied
800W
AC Charging Input
10A
Max Device Power Supported
2300W (10A)
Operating Temperature
-20~55°C
Battery Self-Heating
Low-Temperature Charging Activation (≤5°C)
Connection
Wi-Fi/Bluetooth
Ingress Protection Rating
IP65
Net Weight
38,8kg
Dimensions
420mm × 294mm × 460mm
Acoustic Noise
＜30 dB
Warranty
10-Year
FAQ
1. The battery capacity of the STREAM Ultra X is 3.84kWh, which is twice the battery capacity of the STREAM Ultra.
2. The battery of the STREAM Ultra X has a greater charging power. The maximum charging power is 1500W when using PV, 1200W when using the grid and 1500W when using both.
3. Replacing the DIY Front Case of the STREAM Ultra X is a different process. For more information, see the STREAM
Ultra X User Manual.
Please read the Product Compatibility List in the User Manual before purchasing and using the STREAM Solar Battery with other products (including third-party products).
1. The STREAM AC doesn't support discharging in off-grid mode. It can only work in on-grid mode.
2. The maximum charging/discharging power of the STREAM AC battery is 800W.
3. When the STREAM AC and STREAM Max are connected in parallel, they must be connected to the AC outlet of the STREAM Max using an AC cable. For more information, see the System Expansion Chapter of the STREAM AC User Manual.
*Note: After completing the installation and connection of the STREAM AC, you must configure the system wiring settings in the app before using the device.
4. When a STREAM Max is connected to a STREAM Ultra/Pro/AC Pro/Ultra X in parallel, only one device can be connected to the end of the connection chain.
1. In off-grid mode, the STREAM Max doesn't support discharging via the AC outlet, but it can be charged using the PV port.
2. When the STREAM Max and STREAM Max/AC are connected in parallel, they mustbe connected to the AC outlet of the STREAM Max using an AC cable. For more information, see the System Expansion Chapter of the STREAM Max User Manual.
*Note: After completing the installation and connection of the STREAM Max, you must configure the system wiring settings in the app before using the device.
3. When a STREAM Max is connected to a STREAM Ultra/Pro/AC Pro/Ultra X in parallel, only one device can be connected to the end of the connection chain.
The system prioritizes solar energy. When solar generation falls short of the power demand, the battery automatically steps in to make up the difference. If there’s still a shortfall, the grid supplies the remaining power.When solar output exceeds consumption, the excess energy is first stored in the battery. Any additional surplus can be exported to the grid, depending on your settings and in compliance with local regulations.
All devices must be connected to the same network and added to the same “Space” within the EcoFlow app.
To access the full functionality of the STREAM Series, a connection to Wi-Fi and the EcoFlow app is required. Bluetooth or LAN-only connections will not support features like remote control or historical data tracking.
Yes, a temperature rise during use is normal and does not affect the product’s lifespan. The unit has passed rigorous testing and includes overheat protection. For best performance, install it out of direct sunlight with at least 3 cm clearance from walls or objects, and away from flammable materials.
The system can be self-installed and maintained. However, in the UK, local regulations require the EcoFlow STREAM DIY Cable to be wired into the distribution board, which must be done by a certified installer or electrician.
If you disable the feed-in protection switch in the EcoFlow app, the excess solar power will be fed into the grid.
For safety and compliance reasons, the STREAM system will automatically detect a grid anomaly and stop feeding current into the grid during a power outage. You can then plug in your appliances directly into the AC outlets to use internal battery or solar power.
Compensation policies may vary by region. You should contact your local grid operator using the contact information provided on your electricity bill to inquire.
As long as the panels meet the input range for the PV port and use the same type of connector, they can be used. Each PV port’s input range is: operating voltage 15-60V, operating current ≤14A.
Due to regulatory limits, it is recommended to connect no more than one microinverter.
Not necessarily. It might prioritize using one device's power or discharge multiple devices simultaneously. The system employs an intelligent charging and discharging strategy based on the current power levels of the devices, the power consumption of the appliances, the actual connection setup, and your settings in the app. Thus, the discharging performance of specific devices may vary.
The AI TOU feature means that the EcoFlow app will use dynamic electricity price data from the local power company to perform smart charge and discharge strategies based on peak and off-peak pricing, maximizing your electricity bill savings. This feature requires a subscription.*An AI TOU strategy will only be generated when the price difference between peak and off-peak is substantial enough because charging and discharging involve losses. If the economic benefits are less than the battery loss, charging and discharging will not take place.
No. / No. The Portable Power Station can only be charged by the STREAM Series products, not discharge to them. If you need to expand capacity or power, you can increase the number of STREAM Series products in the STREAM system (up to 6 devices per system).
STREAM Ultra X features a battery capacity around 40% higher than industry standards, helping to minimise solar energy waste. With support for up to 2300W AC output, it can power high-demand appliances, making it the most efficient balcony storage solution for solar energy use.
1. Estimated Electricity Cost Savings (Based on Germany)The estimated savings are calculated using the following formula:
- Annual Savings = Savings from self-consumed system generation + Savings from surplus energy utilisation
- Generation estimates: PVWatts Calculator
Self-consumption rate: Estimated using HTW Berlin's Independence Calculator (source)
- Electricity rate: €0.40/kWh
- Estimated surplus energy utilisation rate (AI Mode, Solar Forecast): 35%
Note: Savings will vary depending on geographic location, panel orientation, daily electricity prices, and other factors.
Example Calculations:
Configuration: Ultra X × 6 + 10 × 500W solar panels (5,000W total)
Annual savings: (5328kWh × 90% × €0.40/kWh) + (5328kWh × 10% × 35% × €0.40/kWh) = €1,993
2. Some AI features in the EcoFlow app require a premium subscription. Please refer to the app for details on plans and feature availability.
3. The EcoFlow app integrates weather data from Solcast, performing over 100 million data operations per hour to deliver forecasts with up to 94% accuracy and a three-day horizon. (source)
