Photovoltaic systems play a central role in the modern energy strategy of companies. However, operators are often faced with a physical problem: electricity generation is rarely synchronised with consumption. At midday, the PV system produces high surpluses, while the energy demand in production and logistics is often highest in the morning or evening.
Here come BESS systems (Battery Energy Storage Systems) come into play. They close the gap between generation and utilisation by acting as intelligent energy storage systems.
Why PV intermediate storage is crucial for the commercial sector
With rising electricity prices and volatile energy markets, the Own consumption is always more valuable than simply feeding it into the grid. A battery storage system ensures that your solar power is not sold for a few cents, but used internally - exactly when your machines or charging stations need it.
The advantages for companies at a glance:
- Increase in self-consumption: Maximum utilisation of self-produced, low-cost electricity.
- Cost reduction: Less expensive grid procurement from the energy supplier.
- Peak shaving (peak load management): Avoidance of expensive power peaks that drive up grid charges.
- Security of supply: Stable energy supply even during grid fluctuations.
- Independence: Less influence from external electricity price increases.
Technology: How the BESS system works
A commercial storage system is more than just a battery. The centrepiece is the EMS (Energy Management System). PV systems supply direct current, which is buffered in the storage system. The EMS decides on the energy flows in real time and fully automatically:
- When do you load? (With PV surplus)
- When do you unload? (For high consumption or expensive electricity prices)
- When will it be capped? (reduction of peak loads)
The result is an intelligent, dynamic energy profile that optimises your company's cost structure.
What storage size makes sense for your business?
Faber E-Tec offers scalable solutions that are precisely tailored to the generation capacity of your PV system and your load profile:
Greencube 418 kWh - For small commercial operations
The entry-level solution is ideal for craft businesses or office buildings with a PV output of approx. 50-150 kW.
Greencube 835 kWh - The standard for medium-sized businesses
Perfectly sized for warehouses, car dealerships, supermarkets or shopping centres. This storage system offers enough capacity to cover base loads at night.
BESS Container 3,340 to 5,015 kWh - The industrial solution
For energy-intensive industrial companies and solar parks. The 5,015 kWh Container convinces with a performance of 2.5 MW and offers decisive advantages:
- Absorption of extremely high charging currents from large PV systems.
- Possibility of parallel operation of several containers (multi-megawatt range).
- Maximum grid optimisation and self-sufficiency.
Practical example: Increase self-consumption and reduce costs
How does a storage facility affect the figures in concrete terms? Let's look at a company with a 500 kWp PV system on the roof:
- Without memory: The proportion of self-consumption is often only approx. 40 %. The rest is fed into the grid at low cost, while expensive grid electricity has to be purchased.
- With 835 kWh BESS: Self-consumption increases to approx. 75 %.
- With 5 MWh container: With an appropriate design, self-consumption rates of 90 % and more possible.
The economic savings result from three factors: Less grid consumption, lower grid charges due to reduced peak loads and optimised use of own energy.
Everything from a single source: integration with transformer stations
A storage system alone is often not enough - the connection to the medium-voltage grid must be ensured. Faber E-Tec offers suitable Compact transformer stations.
This gives you a complete, harmonised energy infrastructure:
- PV system (integration)
- BESS storage system
- Transformer station
- Mains connection
Conclusion: Intermediate PV storage is becoming the economic standard
If you want to utilise solar power efficiently on a commercial scale, there is no way around battery storage systems. BESS systems turn a simple PV system into an intelligent power plant that sustainably reduces your operating costs and creates planning security.
