What is a battery storage system?

A battery storage system stores electrical energy for later use. It typically consists of one or more battery modules, a battery management system and an inverter that converts electricity between direct current (DC) and alternating current (AC). Battery storage is often used in combination with photovoltaic systems but also plays an important role in industrial applications and e-mobility.

Battery storage systems are used across a wide range of sectors – from private households to industry. This article focuses on industrial applications, where battery storage is a central component of modern energy management strategies. It helps companies make better use of renewable energy, optimise load profiles and achieve significant cost savings.

Why is battery storage worthwhile?

Battery storage systems are no longer a technology of the future – they have become a key element of modern energy strategies. The share of renewables in the energy mix continues to grow, but generation remains dependent on weather and time of day. During periods of high production, not all electricity can be used, while at other times there may be a shortfall. These fluctuations lead to pronounced price swings on electricity markets.

It is therefore increasingly important to store electricity when it is abundant and inexpensive. According to a study by the Institute of Energy Economics at the University of Cologne market volatility is rising – making flexible storage solutions ever more valuable.

Advantages of a battery storage system

• Increases self-consumption of on-site generated electricity
• Reduces electricity purchases from the grid
• Protects against rising electricity prices
• Relieves pressure on the grid infrastructure
• Improves supply security
• Enhances the profitability of PV systems
• Contributes to decarbonisation

Especially in times of volatile energy prices and fluctuating renewable generation, battery storage systems provide independence and flexibility.

When does a battery storage system make sense?

A battery storage system is particularly worthwhile when:

• A photovoltaic system is already installed or planned
• Self-consumption is to be increased
• Peak load capping measures are implemented
• Electricity demand is high
• Energy costs are to be reduced in the long term

What types of battery storage systems exist?

There are several types of battery storage technologies:

• Lithium-ion batteries: the most common type, with high energy density and long service life
• Lead-acid batteries: cost-effective but with lower cycle stability
• Saltwater batteries: environmentally friendly but less efficient
• Redox flow batteries: scalable and durable, ideal for large-scale applications

The best choice depends on the specific application, budget and technical requirements.

How can I determine whether a battery storage system is suitable for my company?

Whether a battery storage system is economically viable depends on several factors: electricity consumption, load profile, PV capacity, feed-in tariffs and the share of self-consumed energy. A battery simulation can provide a reliable assessment, offering key performance indicators for profitability and sizing – a solid basis for decision-making.

Advanced simulation tools take into account dynamic factors such as variable load profiles, future electricity price trends or changing feed-in tariffs. They also allow different scenarios to be tested (e.g. PV system expansion or planned production increases). This enables companies to evaluate whether a battery storage system is economically beneficial for their specific case – and what capacity it should have.

Conclusion

A battery storage system is a future-oriented solution for companies aiming to store electricity efficiently, optimise self-consumption, support efficiency optimisation and reduce energy costs. Depending on the application and requirements, different systems offer specific advantages.

For businesses seeking long-term autonomy and sustainability, investing in a battery storage system is a strategic decision – ideally based on a detailed battery simulation.