Balcony power plants, small solar systems for balconies, reduce electricity consumption and contribute to the energy transition. To fully exploit their potential, suitable storage is essential. This article explains why storage is crucial for balcony power plants, what options are available, and which solutions performed best in balcony power plant storage tests in 2025.
Contents
- Why do you need a storage system for a balcony power plant?
- Which storage system is suitable for a balcony power plant?
- How do you choose the right storage system for a balcony power plant?
- Top storage solutions for balcony power plants 2025
- LiTime 48V 30Ah GC2
- LG Chem RESU 10H
- BYD Battery-Box Premium HVS
- SonnenBatterie Hybrid 9.53
- E3/DC S10 E
- Tesla Powerwall 2
- Conclusion
- FAQ about storage for a balcony power plant
Why do you need a storage system for a balcony power plant?
A balcony solar system with a battery storage solution does more than just store excess energy – the effects are greater than you might think:
- Increase in self-consumption rate: Solar power generation is intermittent and only works when there is sufficient sunlight. If household electricity demand doesn't match the generation time, excess energy is wasted. A storage battery can store excess energy generated during the day and use it at night or on cloudy days, thereby increasing self-consumption and reducing dependence on the electricity grid.
- Reduction of grid feed-in: Without a storage battery, excess energy is fed into the grid. A storage battery can store excess energy and avoid unnecessary feed-in to the grid, thus maximizing economic benefits.
- Increased energy self-sufficiency: Traditional electricity supply depends on the grid and can be affected by power outages or price fluctuations. A storage battery transforms the balcony solar system into an independent, small energy system that provides emergency power during outages or grid disruptions, thus increasing energy security in the household.
- Optimizing system efficiency: The volatility of solar power generation can lead to unstable power flow, which can affect the normal operation of electrical appliances. A storage battery can balance the differences between generation and consumption, provide stable voltage, and optimize system efficiency.
Which storage system is suitable for a balcony power plant?
For a balcony power plant, the use of a Lithium battery storage Recommended. Lithium batteries offer high efficiency, a long lifespan, and a compact design that is particularly well-suited to the requirements of small solar power systems. They enable rapid storage of excess solar energy and efficient use even in the hours after sunset or on cloudy days.
Nowadays, almost all modern Solar energy storage systems Equipped with lithium batteries, as these offer optimal performance and ease of use. Compared to other battery types such as lead-acid batteries, they offer significantly more advantages in terms of energy efficiency and maintenance, making them the preferred choice for balcony power plants.
How do you choose the right storage system for a balcony power plant?
If you already own a balcony power plant but are considering a suitable battery storage system, you have two options: either you opt for a portable solar energy storage device that integrates both solar charging and lithium battery storage, or you choose a conventional lithium battery. The main differences between these two options are as follows:
Lithium battery:
A conventional lithium battery primarily serves as an energy storage unit and cannot be directly charged by solar energy. It requires the connection of a solar controller, inverter, and other devices to enable charging and power supply. It typically only provides direct current (DC), and an additional inverter is necessary to provide alternating current (AC). Compared to devices with integrated solar charging capability, installing a lithium battery is more complex and requires specialized electrical engineering knowledge. It is better suited for large, long-term residential or commercial solar systems.
Portable solar energy storage device:
A portable solar energy storage device integrates solar power charging and is equipped with an MPPT or PWM controller, allowing direct connection to the solar panel to charge the battery – without additional equipment. The integrated design enables plug-and-play use, requiring only the connection of the solar panel and the load, eliminating the need for professional installation. However, due to its extensive features, it tends to be more expensive. It is particularly well-suited for small-scale applications in balcony power systems, especially for users who desire ease of use without complex installation.
| Characteristics | Conventional lithium battery | Integrated energy storage |
|---|---|---|
| Functionality | Energy storage only, additional devices required | Integrated solar power charging, multifunctional outputs |
| Installation complexity | Complex installation, requires expertise | Plug and Play |
| Application scenarios | Large solar power plants, fixed installations, high load requirements | Small solar power systems, mobile scenarios, emergency power supply |
| Cost | Low initial costs | High initial costs |
Top 6 storage systems for balcony power plants (test)
Given the diverse needs of users, we have selected six photovoltaic storage batteries or storage systems that we consider particularly recommendable. These products cover various performance characteristics and price ranges. The first three are individual storage batteries, the last three are integrated storage systems. Please read the text as needed to learn more about the products.
LiTime 48V 30Ah GC2
The LiTime 48V 30Ah GC2 Bluetooth lithium battery Offering 1536Wh of energy and 3000W of continuous power, it's ideal for golf carts, ATVs, LSVs, and e-trikes. It features Bluetooth 5.0 for easy connection to the LiTime app and intelligent battery monitoring. With a long lifespan of over 4,000 cycles at 100% DOD and 15,000 cycles at 60% DOD, as well as high discharge performance, it delivers powerful acceleration and a smooth driving experience. It also offers comprehensive protection with a 100A BMS and flexible charging options, including solar or generator power.
| Characteristic | Details |
|---|---|
| Main advantage | - Real-time battery status check via Bluetooth without additional equipment. - Flexible combinations of multiple devices in parallel operation (e.g. 3 devices ≈ 4.32 kWh). - Compared to BYD/Pylontech, it is better suited for small balcony photovoltaic systems. |
| capacity | 1536Wh |
| Area of application | Small balcony photovoltaic systems, DIY storage projects |
| Target audience | Beginners who want to try a DIY storage system for the first time, with an extremely low budget |
| Price | €512.99 |
LG Chem RESU 10H
The LG Chem RESU 10H is a state-of-the-art energy storage system for residential photovoltaic installations, equipped with an integrated Battery Management System (BMS) to ensure safe and efficient operation. With a capacity of 9.6 kWh and a power output of up to 5 kW, it provides a reliable power supply, even during peak demand or in emergencies. The storage system is scalable, allowing expansion up to 19.2 kWh, and supports both RS485 and CAN communication protocols. It is also compatible with leading inverters such as the SMA Sunny Boy Storage.
| Characteristic | Details |
|---|---|
| Main advantage | - Supports multiple parallel extensions. - Compatible with various inverters (z.B. SMA, SolarEdge) |
| capacity | 9600 Wh |
| Area of application | Home energy storage |
| Target audience | Suitable for users with a medium to high budget who seek large capacity, high performance and brand reliability; suitable for families with high electricity demands. |
| Price | €3,360.50 |
BYD Battery-Box Premium HVS
The BYD Battery-Box Premium HVS offers powerful emergency power and off-grid functionality with award-winning efficiency thanks to true series connection. Its patented modular plug-in technology allows for flexible, user-friendly installation without internal wiring. Featuring a cobalt-free lithium iron phosphate (LFP) battery, it provides maximum safety, lifespan, and performance. The system is compatible with leading 1- and 3-phase inverters and can be flexibly expanded to achieve a capacity of up to 38.4 kWh.
| Characteristic | Details |
|---|---|
| Main advantage | - Modular design, wall or floor mounting. - Compatible with most common inverters (z.B. Fronius, Kostal) |
| capacity | 5100Wh |
| Area of application | Medium and large photovoltaic systems for private households |
| Target audience | - Households with high electricity demand: They need to supply electricity to appliances with high electricity consumption, such as refrigerators and air conditioners. - Long-term network-independent users: e.g. country houses or holiday homes. |
| Price | 2000-2500 € |
SonnenBatterie Hybrid 9.53
The sonnenBatterie hybrid 9.53 is an innovative energy supply solution for homes, combining high efficiency and flexibility. With a capacity of 9.53 kWh, it provides enough energy to cover a household's electricity needs and store excess energy. The battery is particularly environmentally friendly, as it is equipped with long-lasting lithium iron phosphate (LFP) technology. It integrates seamlessly into existing solar systems and enables intelligent control for efficient energy use. Furthermore, it offers the highest safety standards and is suitable for both residential and commercial applications.
| Characteristic | Details |
|---|---|
| Main advantage | - Integrated inverter, intelligent energy management system, supports virtual power plant (VPP). - Plug and Play, adaptable to balcony PV systems, supports emergency power function. |
| capacity | 5000-15000Wh |
| Area of application | PV energy storage for households |
| Target audience | - High-end home users who focus on brand building and long-term investments. - Environmentalists who need the functionality of a virtual power plant (VPP) and want to participate in the shared use of energy. - Users who value the aesthetics of their properties (e.g., villas or modern apartments). |
| Price | Approximately €8,000 |
E3/DC S10 E
As a benchmark product for home energy storage systems in Germany, the E3/DC S10 E, with its modular design, efficient energy management, and reliable emergency power function, is the ideal partner for balcony photovoltaic systems and home storage solutions. The S10 E PRO enables the use of home power plant advantages in new application areas and offers battery capacities from 11.7 to 46.7 kWh. With a charging and discharging capacity of up to 12 kW, it effectively supports the operation of heat pumps and the overnight charging of electric vehicles from the solar storage system.
| Characteristic | Details |
|---|---|
| Main advantage | - Modular design for flexible capacity expansion. - Integrated inverter and emergency power function, no separate purchase required. - High efficiency during charging and unloading (>95%). |
| capacity | 4500-13800 Wh |
| Area of application | Balcony photovoltaic systems, hybrid energy houses |
| Target audience | Families with a medium budget who need flexibility to expand capacity |
| Price | Approximately €6,000-12,000 |
Tesla Powerwall 2
The Tesla Powerwall 2 offers twice the storage capacity of its predecessor, at 13.5 kWh, and is ideal for medium to large photovoltaic systems. It enables efficient use of generated solar power, reduces dependence on energy providers, and can be expanded with additional modules as needed. Thanks to its backup power capability, the system remains operational for up to seven days during power outages. The Powerwall 2 is quiet, child-safe, and requires no regular maintenance, while its performance can be conveniently monitored via the Tesla app.
| Characteristic | Details |
|---|---|
| Main advantage | - Integrated inverter and intelligent management functions. - Supports solar optimization and emergency power supply. - Can be monitored in real time via the Tesla app. |
| capacity | 13500 Wh |
| Area of application | Home photovoltaic systems for consumers with high electricity demand |
| Target audience | - Technology enthusiasts who are looking for the value of the Tesla brand. - Households with high electricity consumption (e.g., multiple appliances, charging of electric vehicles). - Users who need to monitor energy consumption in real time via an app. |
| Price | Approximately €8,000-10,000 |
Conclusion
Which battery storage system is best for a balcony power plant? We hope this article answers your questions and helps you choose the right storage system. The table below provides a quick overview of the key features of each product.
| Products | Type | Target audience | Main advantages | Disadvantages |
|---|---|---|---|---|
| LiTime 48V 30Ah | Conventional lithium battery | Beginner, ultra-low budget balcony photovoltaics | Very low price, Bluetooth monitoring. | Small capacity (multiple units required). |
| LG Chem RESU 10H | Conventional lithium battery | Medium to high budget household | Large storage capacity. | Higher price, requires external devices. |
| BYD Battery-Box HVS | Conventional lithium battery | Households with high energy demands, off-grid users | Large capacity, reliable brand. | High initial costs. |
| SonnenBatterie Hybrid 9.53 | Integrated energy storage | High-end household users, environmentalists | VPP support, extremely long lifespan. | Expensive. |
| E3/DC S10 E | Integrated energy storage | Households with a medium budget, backup power requirements | Modular expansion. | Expensive. |
| Tesla Powerwall 2 | Integrated energy storage | Technology enthusiasts, households with high electricity demand | Brand value, high energy density. | Fixed capacity. |
FAQ about storage for a balcony power plant
What is the best storage solution for a balcony power plant?
The 6 storage systems for a balcony power plant presented in the text are all great, but each has a different price and is suitable for different scenarios, so please buy according to your needs.
How large should the storage tank be for a balcony power plant?
The size of the storage system for a balcony solar power plant depends on your own electricity consumption and the desired level of energy independence. For most households, a storage capacity of approximately 2 to 5 kWh is sufficient to store excess solar power for self-consumption and use at night or on cloudy days. Larger storage systems can be advantageous if you are aiming for greater independence from external electricity providers.
Is a balcony power plant with 2000 watts and storage a worthwhile investment?
A 2000-watt balcony solar power system with storage can be quite useful, especially if you want to store excess solar power for your own use. With storage, the generated electricity can also be used at night or on days with little sunshine, increasing energy independence and reducing electricity bills. The combination of 2000 watts of power and storage offers a good solution for smaller households or apartments to maximize the use of self-generated electricity.
Is a battery storage system worthwhile for a balcony power plant?
A battery storage system for a balcony solar power plant can be worthwhile if you want to use the generated solar power even outside of daylight hours. It stores excess energy produced during the day and allows for use in the evening and at night, or on cloudy days. This increases independence from the power grid and can reduce electricity costs in the long run. Whether it's worthwhile depends on factors such as your own electricity consumption, the storage and installation costs, and the size of the balcony solar power plant.
