A balcony power plant with storage is more than just a trend – it's a crucial step towards self-sufficiency and cost control. Being able to not only generate but also store electricity allows for better balancing of peak demand, reduces reliance on the grid, and makes you more independent from fluctuating electricity prices. Especially with rising energy prices, it's worthwhile to utilize the full potential of your own photovoltaic system.
EcoFlow's STREAM series 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 simple retrofitting of an existing setup or as a complete, high-performance system – there's a suitable solution for every application.
In this article, we'll show you the differences between the three storage systems, the technical advantages they offer, and how to make the right decision for your home.
Overview: The three EcoFlow STREAM storage solutions
All storage systems in the STREAM series are modularly expandable, durable (up to 6000 charge cycles at 70%), and can be conveniently controlled via app. Thanks to AI-powered optimization, your energy flows are managed intelligently. However, there are key differences:
- The AC Pro is an AC-coupled solution for the easy retrofitting of existing balcony power plants.
- The STREAM Pro is a hybrid storage system with an integrated inverter and three MPPT inputs.
- The STREAM Ultra offers four MPPT inputs, maximum performance and flexibility for demanding setups.
Technical specifications compared
All three EcoFlow STREAM series energy storage systems are based on modern lithium iron phosphate (LiFePO4) technology, offer a long lifespan with up to 6,000 charging cycles, and are modularly expandable up to 12 kWh. They can be conveniently controlled and monitored via Wi-Fi or Bluetooth using the EcoFlow app. You can find the most important technical differences in a direct comparison here:
|
Model |
type |
Capacity (Basic) |
Expandable up to |
MPPT inputs |
PV input power |
AC output (mains-powered) |
|
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 control via app, are weatherproof (IP65) and are suitable for use on balconies, terraces or indoors.
Who is each system intended for?
AC Pro – Ideal for retrofitting:
Do you already have a balcony power plant in operation and now want to retrofit a battery storage system 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 plant – without PV inputs or special technical requirements.
Thanks to plug & play installation, you can easily connect the AC Pro yourself: simply connect the storage unit to a power outlet using the power cable and conveniently control all functions via the EcoFlow app. The system automatically analyzes your consumption habits and intelligently adjusts the charging and discharging behavior.
Whether for tenants with limited connection options or for users who want 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 get more self-consumption from your balcony power plant and noticeably reduce your electricity bill.
STREAM Pro – The versatile everyday solution
The STREAM Pro is ideal for anyone planning a new balcony power system or looking to expand their existing system with a smart storage solution. As a hybrid model with an integrated inverter, it combines storage functionality and PV control in a single device – saving space and multiple components.
Of particular note are the three independent MPPT inputs, which allow for the separate operation of multiple solar panel groups. This is especially advantageous if your panels are distributed across different directions, such as on an east/west-facing balcony. Thanks to the separate control, the system extracts maximum performance from each solar panel, even under varying light conditions.
With a mains-powered output of 800 W and a bypass function of up to 2300 W, the STREAM Pro reliably covers the basic energy 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. The STREAM Pro is therefore ideal for users looking for 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 energy needs, large solar arrays, or a strong desire for grid independence. With four full-fledged MPPT inputs, up to four solar panel 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, expandable up to 12 kWh, the STREAM Ultra offers high discharge power and precise control via the EcoFlow app. Combined with smart home systems and variable electricity tariffs, you can intelligently schedule charging times, store energy efficiently, and flexibly balance peak consumption.
Whether for family households with high energy demands, 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 ratio: Which solution is worthwhile and when?
The biggest solution isn't always automatically the best – especially not for your wallet. What matters is what requirements you have 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 price and quick integration into existing systems. It's ideal if you want to increase your self-consumption directly without complex modifications.
The STREAM Pro offers significantly more 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, offering an excellent overall package of expandability, intelligent control, and high performance. It is ideal for anyone who wants to power their home with solar energy in a particularly efficient, flexible, and future-proof way – such as larger households, smart home enthusiasts, or people with high electricity consumption who prioritize maximum independence from the grid.
Important: All models are durable, expandable and updatable – making them future-proof investments.
Decision-making aid: What you can use as a guide
These questions will help you choose the right storage solution:
- Do you already have a balcony power plant or are you starting completely from scratch?
- Do you want to simply upgrade your storage or integrate it directly 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 technology play in your life?
- What is your daily electricity consumption – single household, family or home office?
- Are you thinking about a long-term expansion of your investment?
The clearer you can answer these points for yourself, the more effectively you can select the right STREAM model.
Conclusion: Three powerful storage devices, one suitable solution
Ultimately, the decision depends on your daily routine, your electricity consumption, and the role solar power should play in your home. Take the time to compare options – and find the solution that suits you.
Compare, configure – and launch your own energy future with EcoFlow STREAM! If you have any questions or are unsure which system best suits you, we'd be happy to advise you.
