Battery storage - BESS cubes for industry and solar farms
POWER CUBES
Commercial battery storage systems
PowerCubes: Scalable energy storage for large-scale photovoltaic plants
Both systems operate with the same LFP cell technology, the same liquid cooling and the same grid connection standards. They differ in power output, footprint and expansion stage – not in the technology behind them. By connecting to the spot market, you shift the feed-in time and increase the economic efficiency of your system.
Which PowerCube is right for your project?
The selection depends on the required capacity at the grid connection point and the available area. Both systems can be interconnected on a project-specific basis to achieve higher capacity classes.
PowerCube 418
Compact C&I system for peak shaving, self-consumption and primary/secondary frequency modulation. Manufacturer: Cospowers and Faber Solartechnik.
PowerCube 836
For all BESS concepts: green electricity or grey electricity, stand-alone or co-location, greenfield or in an industrial environment.
The space requirement in direct comparison
Both housings in one drawing, same scale, 1.80 m person as a reference.
Twice the capacity of the 836 requires around 2.2 times the floor space.
- 418 · 1.96 m² footprint · 3 t
- 836 · 4.39 m² floor space · 8 t
Schematic representation based on the dimensional drawings of the product data sheets (as of June 2026). Footprint and energy density calculated from the dimensions. Foundation and maintenance clearances not included; these will be determined by us during project planning.
Why the PowerCube is worth it
In most projects we combine several revenue streams. Which combination makes sense depends on the load profile, grid connection and marketing strategy.
Grid connection from a single source
We develop and manufacture the matching transformer station ourselves, tailored to the PowerCube. We also plan the medium-voltage connection and protection concept at the same time!
increase self-consumption from PV
Surplus energy from the PV system is stored and used in the evening, rather than being fed into the grid at low prices.
spot market and direct marketing
Thanks to the smart connection to the spot market, charging takes place when prices are low and discharging during high-price hours – the time of feed-in can be freely shifted.
Provide balancing energy
The systems are designed for primary and secondary frequency modulation and comply with the grid connection standards VDE-AR-N 4110 and 4120 as well as FGW TR8.
buffer charging infrastructure
High-power charging points can also be operated on weak grid connections because the storage system absorbs the simultaneity peaks of the charging processes.
emergency power supply and black start
All systems are capable of black start and are equipped with earth fault monitoring, reverse polarity protection and surge protection.
Tested to current IEC and VDE standards
Both systems comply with the relevant standards for safety, grid connection and efficiency. The following details apply equally to the BESS PowerCube 418 and the BESS PowerCube 836.
Grid standards Germany
- VDE-AR-N 4110:2023
- VDE-AR-N 4120:2018/A1:2024
- FGW TR8:2019
PCS certifications
- IEC 62109-1/2
- IEC 62477-1
- IEC 61000-6-2/4
PCS warranty
- 5 years standard, extension upon request
Battery module warranty
- 10 years or 10,000 cycles
- Maximum scalability for solar parks and industry
The advantages of the PowerCube 836 compared to the PowerCube 418
Unlike the compact PowerCube 418, the PowerCube 836 doubles your storage capacity to 836 kWh – and does so on virtually the same footprint. This extremely high energy density makes the high-performance battery storage system the first choice for retrofit projects in existing solar parks as well as for the efficient expansion of industrial energy infrastructures.
Smart Grid functions
- Volt and frequency ride-through
- ramp-rate limitation, power factor
- Volt-Var, Freq-Watt, Volt-Watt
Security
- Reverse polarity and overvoltage protection
- earth fault monitoring
- Fire protection according to NFPA 855 / NFPA 69
Design for your project
Send us your load profile or annual consumption, your grid connection capacity and the available area. We will check which size is suitable and calculate the potential revenue from peak shaving, self-consumption and the spot market for you.
Get PowerCube online now request
In addition to our high-performance battery storage systems such as the PowerCube, Faber E-Tec GmbH plans and implements tailor-made Transformer stations and Compact stations. These are tailored precisely to the performance data, the inverters and the requirements of the respective BESS class.
BESS EPC Complete solutions from a single source
Procuring an industrial battery storage system is only the beginning. As an experienced EPC (Engineering, Procurement, Construction) provider, Faber E-Tec GmbH delivers the entire infrastructure for the BESS PowerCubes turnkey from a single source. We take care of the complete electrotechnical BESS planning, the procurement and coordination of all components, and the final on-site installation for you. In this way, we minimise interface risks during system integration and guarantee that your energy storage project is connected to the grid smoothly, on schedule, and in compliance with standards.
Battery modules, inverter, thermal management and fire suppression system are already integrated and wired within the enclosure. On-site work is limited to the foundation, cable connection and commissioning – rather than the assembly of a storage system from individual components. This significantly shortens construction time compared to custom-configured systems and makes the schedule predictable. If higher power requirements arise, we install multiple units in parallel instead of redesigning the project from scratch.
The BESS PowerCube is specially designed for demanding environmental conditions and direct outdoor installation. The robust system protection rating of IP55 (inverter/PCS up to IP66) and an extremely wide temperature range from -40 to +60 °C guarantee reliable outdoor operation. Intelligent, active liquid cooling and a multi-stage, NFPA-compliant fire protection concept safeguard your storage project and investment over the long term.
As an EPC partner, we handle the engineering, procurement and construction of the BESS PowerCube, operating in accordance with ISO 9001 and ISO 45001. The system components are certified to IEC 62109-1/2, IEC 62477-1 and IEC 61000-6-2/4. On request, we can supply the appropriate medium-voltage solution and transformer substation from our own production – meaning that the most critical interface in the project, the one between the storage system and the grid connection point, lies within a single scope of responsibility.
Through the integrated, state-of-the-art energy management system (EMS), the PowerCube 836 is monitored 24/7 in real time. All relevant BESS operating data, the current state of charge and important system messages are available to you at any time via remote access. This enables predictive maintenance and the economically optimal control of your industrial battery energy storage system.
At Faber E-Tec, the same project manager accompanies you throughout the entire duration of your storage project: feasibility analysis and economic forecast, technical design, approval documentation, construction and grid connection in accordance with VDE-AR-N 4110. You do not coordinate interfaces between multiple suppliers, but have a single point of contact – with someone who knows your project.
Start your BESS project
Send us your load profile data or project documents. Our engineers will evaluate your load profile, and you will generally receive a well-founded economic feasibility forecast for your PowerCube within 7 days.
What planners and operators ask most frequently
When is the 418 the right choice, and when is the 836?
The decisive factor is the required power at the grid connection point. The PowerCube 418 delivers 200 kW at 418 kWh and suits commercial and industrial load profiles – such as for peak shaving or increasing self-consumption of PV energy. The PowerCube 836 delivers 418 kW at 836 kWh and is designed for utility-scale projects, stand-alone storage systems and co-location alongside solar or wind farms. Where space is limited, the footprint is also relevant: 1.96 m² compared to 4.39 m² per cube.
Can multiple cubes be combined into larger systems?
Yes. Both sizes are installed in parallel multiple times in practice to achieve higher power and capacity classes. We create the specific design, including medium-voltage connection, transformer station and protection concept, on a project-specific basis.
How long does the storage last?
Can the systems be installed outdoors?
Yes. The operating temperature range is from −40 to +60 °C; above 45 °C, there is a reduction in performance. The permissible relative humidity is 0–95 %, provided there is no condensation. The 418 is rated to IP54, whilst the 836 is rated to IP55 with battery modules that also offer IP67 protection. With noise emissions of ≤ 65 dB, the unit remains manageable even in the vicinity of residential areas.
Can the systems be installed outdoors?
How is the fire protection designed?
Which grid connection standards are complied with?
How your BESS project works – from enquiry to commissioning
A commercial BESS (Battery Energy Storage System) project is not an off-the-shelf solution. For maximum profitability, we begin with the precise analysis of your data. The result: a tailor-made industrial battery storage system that matches your load profile, the planned grid connection and your commercialisation strategy precisely.
Request & transmission of load profile data
You send us your load profile data, annual consumption or complete project documentation for your solar farm – simply via the enquiry form or directly by email and telephone. If a preliminary enquiry or feedback from the grid operator is already available, we integrate the specifications regarding voltage level and grid connection point directly into the BESS planning.
Our engineers will evaluate your data, calculate the optimal storage capacity and performance, and assess revenue potential. In doing so, we focus on peak shaving, self-consumption optimisation and spot market trading. You will generally receive your project-specific profitability forecast for the battery storage system within seven days of receipt of complete data.
System integration from a single source: With us, you receive the BESS battery storage system including the matching transformer station (compact substation). This includes the complete medium-voltage connection, the certified protection concept and the grid connection in accordance with VDE-AR-N 4110 / 4120. Following successful commissioning, Faber Energy Trading can, on request, take over ongoing optimisation and storage trading.
