A balcony power plant with storage is more than just a trend—it's a decisive step toward self-sufficiency and cost control. Those who can not only generate but also store electricity can better balance peak consumption, reduce their electricity consumption from the grid, and become less dependent on fluctuating electricity prices. Especially with rising energy prices, it's worthwhile to utilize the full potential of their own photovoltaic system.
With its STREAM series, EcoFlow offers three modern storage solutions perfectly tailored to the requirements of balcony power plants. The AC Pro, STREAM Pro, and STREAM Ultra variants differ primarily in their connection type, PV input control, and everyday flexibility. Whether for a simple retrofit of an existing setup or as a complete high-performance system – there is a suitable solution for every application.
In this article, we'll show you the differences between the three storage options, the technical advantages they offer, and how to make the right choice for your home.
Overview: The three EcoFlow STREAM storage solutions
All storage units in the STREAM series are modularly expandable, durable (up to 6,000 charging cycles at 70%), and can be conveniently controlled via an app. Thanks to AI-supported optimization, your power flows are intelligently managed. But there are key differences:
- The AC Pro is an AC-coupled solution for easy retrofitting of existing balcony power plants
- The STREAM Pro is a hybrid storage system with integrated inverter and three MPPT inputs
- The STREAM Ultra offers four MPPT inputs, maximum power and flexibility for demanding setups
Technical data in comparison
All three storage systems in the EcoFlow STREAM series are based on modern lithium iron phosphate (LiFePO4) technology, offer a long service life with up to 6,000 charging cycles, and are modularly expandable to up to 12 kWh. They can be conveniently controlled and monitored via Wi-Fi or Bluetooth using the EcoFlow app. You can find a direct comparison of the key technical differences here:
|
Model |
type |
Capacity (base) |
Expandable up to |
MPPT inputs |
PV input power |
AC output (grid-connected) |
|
AC Pro |
AC-coupled |
1.92 kWh |
up to 12 kWh |
– |
– |
800 W |
|
STREAM Pro |
Hybrid + Inverter |
1.92 kWh |
up to 12 kWh |
3 × 500 W |
2000 W |
800 W |
|
STREAM Ultra |
Hybrid + Inverter |
1.92 kWh |
up to 12 kWh |
4 × 500 W |
2000 W |
800 W |
All models feature intelligent app control, are weatherproof (IP65) and are suitable for use on balconies, terraces or indoors.
Which system is intended for whom?
AC Pro – Ideal for retrofitters
Do you already have a balcony power station in use and now want to add a storage unit without having to completely rebuild the entire system? Then the AC Pro is the perfect choice for you. As a purely AC-coupled storage solution, it can be easily integrated into almost any existing balcony power station – without the need for PV inputs or special technical requirements.
Thanks to plug-and-play installation, you can easily set up the AC Pro yourself: You connect the storage unit to a power outlet using the power cable and conveniently control all functions via the EcoFlow app. The system independently analyzes your consumption habits and intelligently adjusts the charging and discharging behavior.
Whether for tenants with limited connection options or for users looking to expand their existing system with a storage solution, the AC Pro delivers real added value without modifying the existing solar system. This allows you to maximize your self-consumption from your balcony power plant and significantly reduce your electricity bill.
STREAM Pro – The versatile everyday solution
The STREAM Pro is ideal for anyone planning a new balcony power plant or expanding their existing system with an intelligent storage solution. As a hybrid model with an integrated inverter, it combines storage functionality and PV control in a single device, saving space and requiring multiple components.
Particularly noteworthy are the three independent MPPT inputs, which allow you to operate multiple solar module groups separately. This is especially advantageous if your modules are distributed in different directions, such as on an east- or west-facing balcony. Thanks to the separate control system, the system gets the most out of each solar panel, even in changing light conditions.
With a grid-connected output of 800 W and a bypass function of up to 2300 W, the STREAM Pro reliably covers the basic needs of small to medium-sized households or home offices. Using the EcoFlow app, you can not only monitor the system but also actively control it and analyze consumption patterns. This makes the STREAM Pro ideal for users seeking a balanced mix of performance, flexibility, and ease of use.
STREAM Ultra – For maximum performance & self-sufficiency
The STREAM Ultra is the most powerful and versatile storage solution in the EcoFlow STREAM series. It is designed for demanding users with high power requirements, large solar systems, or a strong desire for independence from the power grid. With four full-featured MPPT inputs, up to four solar module groups can be individually controlled—ideal for complex setups on roofs, balconies, terraces, or facades.
In addition to a base capacity of 1.92 kWh, which can be expanded up to 12 kWh, the STREAM Ultra offers high discharge performance and precise control via the EcoFlow app. Combined with smart home systems and variable electricity tariffs, you can intelligently schedule charging times, store energy in a targeted manner, and flexibly balance consumption peaks.
Whether for family households with high energy needs, for technology enthusiasts, or for anyone who wants to maximize the use of their PV system: The STREAM Ultra stands for maximum efficiency, maximum control, and a future-proof energy solution.
Price-performance factor: Which solution is worthwhile and when?
The largest solution isn't always automatically the best—especially not for your budget. What matters is what your requirements are for your solar solution and how much you want to get out of the energy you generate.
The AC Pro scores points with its affordable entry-level price and quick integration into existing systems. It's ideal if you want to increase your home energy consumption directly without extensive modifications.
The STREAM Pro offers significantly greater flexibility in module control, making it ideal for users who want to efficiently combine different module groups—for example, on an east-west facing balcony. The slightly higher price is reflected in the expanded functionality: Three MPPT inputs and the integrated inverter make the system particularly efficient and versatile.
The STREAM Ultra is the premium solution within the STREAM series and offers an excellent overall package of expandability, intelligent control, and high performance. It is ideal for anyone who wants to supply their home with solar power in a particularly efficient, flexible, and future-oriented way—such as larger households, smart home enthusiasts, or people with high electricity consumption who value maximum independence from the grid.
Important: All models are durable, expandable, and updateable – making them future-proof investments.
Decision-making aid: What you can base your decision on
These questions will help you choose the right storage solution:
- Do you already have a balcony power plant or are you starting from scratch?
- Would you like to simply upgrade your storage or integrate it into a complete system?
- How many solar panel groups do you want to connect – one or more?
- What role do app control, automation and smart home play for you?
- What is your daily electricity consumption – single household, family or home office?
- Are you thinking about a long-term expansion of your facility?
The more clearly you can answer these questions for yourself, the more precisely you can select the right STREAM model.
Conclusion: Three powerful storage devices, one suitable solution
With the STREAM series, EcoFlow has developed three solutions specifically tailored to different requirements. The AC Pro is perfect if you want to easily add storage to your balcony power plant. The STREAM Pro offers you additional options for controlling your solar modules, making it ideal for everyday use. If, on the other hand, you want maximum control, performance, and independence, the STREAM Ultra is the right choice.
Ultimately, the decision depends on your daily routine, how much electricity you use, and what role solar power should play in your home. Take the time to compare options and find the solution that's right for you.
Compare, configure, and launch your own energy future with EcoFlow STREAM! If you have any questions or are unsure which system is best for you, we'd be happy to advise you.
