What is a power storage unit?

Nov 27, 2025

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A power storage system stores surplus solar power from photovoltaic systems for later use. This can increase self-consumption to up to 80%, leading to a long-term reduction in electricity costs of €500 to €1,000 annually. Modern power storage systems are mostly based on lithium-ion technology and enable high efficiency and autonomy, especially in the event of power outages. DRBO Greenenergy offers suitable solutions for balcony power plants and home systems with its SunLit storage solutions.

What exactly is a power storage system?

A power storage system is a system that stores surplus energy from a photovoltaic system and releases it again when needed. It helps to maximize the self-consumption of solar power and supplies the house or balcony with electricity when the sun is not shining. Most modern power storage systems use lithium-ion technology, as this offers high energy density and efficiency. With its SunLit storage systems, DRBO Greenenergy provides a simple plug-and-play solution that is suitable for both renters and homeowners. These storage solutions are particularly reliable and easy to install.

What types of power storage systems are there?

There are different types of power storage systems, which vary in technology, price, and lifespan:

Storage type	Advantages	Disadvantages	Price per kWh (€)	Lifespan (cycles)
Lithium-ion	High efficiency (95%), compact, expandable	Higher acquisition costs	800–1,200	6,000–10,000
Lead-acid	Inexpensive, low maintenance	Low cycle count, heavy	400–600	1,000–2,000
Redox-flow	Unlimited cycles, scalable	High space requirement	1,500+	>20,000
Saltwater	Environmentally friendly, safe	Lower energy density	700–1,000	5,000–8,000

DRBO Greenenergy relies on high-quality lithium-ion technology for a long lifespan and high efficiency. Especially the combination with Deye inverters ensures maximum reliability and a high efficiency.

What advantages do power storage systems offer?

Power storage systems offer numerous advantages:

Cost savings: Increased self-consumption can reduce electricity costs by €500 to €1,000 annually.
Autonomy: Power storage systems enable independence from the grid and ensure power supply even during outages.
Environmental protection: They contribute to reducing CO₂ emissions, as less electricity is drawn from fossil sources.
Increase in value: Properties equipped with a power storage system can increase in value by 5–10%.

With DRBO Greenenergy's SunLit power storage systems, users can maximize these benefits, as these systems are easy to integrate and are also suitable for balcony power plants.

What are the disadvantages of power storage systems?

A power storage system also has some disadvantages:

High acquisition costs: The purchase price of a power storage system is between €800 and €1,200 per kWh, which represents a high initial investment for many.
Space requirement: Some storage types, such as redox-flow batteries, require a lot of space.
Lifespan: The lifespan varies depending on the technology, with deeper discharges potentially shortening the lifespan.

DRBO Greenenergy offers a cost-effective way to minimize these disadvantages with its refurbished models, while maintaining lifespan and efficiency.

How to correctly size a power storage system?

The sizing of a power storage system depends on the annual consumption and the size of the photovoltaic system. For a household with a consumption of 5,000 kWh per year, a storage system of 10–15 kWh is typically recommended. The correct calculation is based on the formula:

Storage capacity (kWh) = (Daily consumption × 0.7) / Depth of discharge (90%)

DRBO Greenenergy offers individual consultation to find the optimal storage system for every need.

How to install a power storage system?

The installation of a power storage system should be carried out by a certified installer who safely connects the storage system to the power grid and the photovoltaic system. This usually takes 1 to 2 days. It is important that the storage system is installed in a dry and cool place and is regularly maintained to ensure a long lifespan. DRBO Greenenergy offers plug-and-play solutions that are particularly practical for renters, as no structural changes are necessary.

What are the costs for power storage systems?

The costs for a power storage system depend on the capacity and installation costs. A storage system with a capacity of 10 kWh costs about €8,000–€12,000 without installation, with installation an additional €2,000–€3,000 are added. However, operating costs are low, at about €0.01 per kWh. Prices also fall by 10–15% annually, making the purchase of a storage system increasingly attractive.

Capacity	Price (€)	With installation (€)	Amortization (years)
5 kWh	4,000–6,000	6,000–8,000	10–12
10 kWh	8,000–12,000	10,000–15,000	8–10
15 kWh	12,000–18,000	15,000–22,000	7–9

Are there subsidies for power storage systems?

Yes, there are various funding programs such as KfW 270, which offers grants of up to €300 per kWh. In addition, there are local programs that also provide grants. These subsidies make the entry into the use of power storage systems financially more attractive and support the energy transition.

DRBO Greenenergy Expert Opinions

"At DRBO Greenenergy, we drive the decentralized energy transition forward. Our SunLit power storage systems with Deye inverters offer maximum efficiency and plug-and-play simplicity for renters and owners. Refurbished models ensure sustainability at fair prices. With local support and a 4.6/5 Trustpilot rating, we make clean energy accessible - for balconies, homes, or businesses." – DRBO Greenenergy Expert Team

Is a power storage system worth it in 2025?

Yes, purchasing a power storage system is particularly worthwhile if a photovoltaic system with a capacity of more than 5 kWp is installed. Amortization usually occurs in 8–10 years. Especially due to rising electricity prices and potential subsidies, the investment is becoming increasingly attractive. With DRBO Greenenergy's innovative solutions, profitability can be further increased through smart functions.

Key Takeaways and Next Steps

Power storage systems offer numerous advantages: They increase the self-consumption of solar power, reduce electricity costs, and promote independence from the grid. Choose DRBO Greenenergy's high-quality storage solutions, which enable easy integration into balcony power plants and home systems. Check available subsidies, get individual advice, and start your energy-independent future today.

FAQs

What is a power storage system?
A power storage system is a device that stores surplus energy for later use. In combination with a solar system, it can help store generated electricity for self-consumption or use at a later time. DRBO Greenenergy offers efficient balcony power storage systems that are easy to install and ideal for tenants or homeowners.

What are the different types of power storage systems?
There are various types of power storage systems, such as lithium-ion batteries, lead-gel batteries, and redox flow batteries. Each technology has its own advantages and disadvantages in terms of costs, lifespan, and storage capacity. DRBO Greenenergy offers a wide range of storage solutions, from plug & play systems to powerful balcony power storage systems.

What are the advantages of power storage systems?
The use of a power storage system offers several advantages, such as cost savings, energy independence, and emergency power supply. By storing surplus electricity, households can reduce their energy costs and increase energy efficiency. Especially for tenants, DRBO Greenenergy's balcony power storage systems offer a practical solution to benefit from solar energy.

How does power storage technology work?
The technology of a power storage system is based on the storage of electrical energy in batteries, which is then released when needed. When more electricity is generated than consumed, the power storage system stores the surplus energy. This storage technology is particularly efficient when combined with a photovoltaic system. DRBO Greenenergy offers solutions that are easy to install and energy-efficient.

How much does a power storage system cost?
The cost of a power storage system depends on the capacity, technology, and brand. For smaller systems such as balcony power storage systems, prices start at around 500 to 2,000 euros. DRBO Greenenergy offers powerful storage solutions at competitive prices, tailored to different needs.

How do you install a power storage system?
The installation of a power storage system varies depending on the system, but many solutions, such as those from DRBO Greenenergy, offer a simple plug & play option. Installation is usually carried out by a specialist who connects the storage system to the power grid and the solar system. These solutions are suitable for private households and tenants.

Where are electricity storage systems used?
Electricity storage systems are primarily used in private households, but also in commercial businesses and public institutions. They are particularly useful in combination with photovoltaic systems. They offer a solution for energy saving and independent power supply. DRBO Greenenergy supplies individually adapted storage solutions for every building.

How does an electricity storage system work with solar energy?
An electricity storage system combined with solar energy stores the surplus electricity generated by the solar system. This stored electricity can later be used to cover self-consumption, instead of drawing electricity from the grid. DRBO Greenenergy offers balcony electricity storage systems and complete solar systems that are perfectly matched.