BESS: No energy transition without storage

Battery Energy Storage Systems: Affordable. Scalable. Safe.

The market for battery energy storage systems (BESS) is growing rapidly, with new installation records year after year. Beyond large-scale grid storage and industrial applications, residential storage solutions represent another strong and fast‑growing market.
We support companies across the value chain in addressing the key challenges of developing cost‑efficient, safe and scalable BESS products — and bringing them reliably to market and grid connection.

Utility-scale BESS

Large-scale storage systems stabilize power grids, enable the integration of fluctuating renewable generation, and unlock revenues from ancillary services and energy arbitrage.
We design and optimize utility‑scale BESS for high availability, safety and bankable business cases.

Industrial BESS

Industrial storage systems reduce peak loads, secure critical processes and increase on‑site use of renewable energy such as PV.
We support OEMs with product strategy, develop and benchmark storage systems, and integrate BESS with EMS, on‑site consumption or charging infrastructure to create robust energy hubs.

Residential storage

Residential storage makes solar power predictable — increasing self‑consumption, enabling backup power and unlocking smart tariff models.
We support manufacturers from strategy to product development, help to reduce failure rates and test solutions at the world’s largest independent high‑voltage battery development and test center.

Components

Cell, electronics, controls and thermal management development

Systems

System integration, industrialization, localization and testing

Use cases

Simulation, translation into system requirements and testing regimes

Ecosystem

Integration of BESS into energy and mobility ecosystems

FEV e+r: Our tools and facilities

Cell laboratory
State‑of‑the‑art cell laboratory for customized battery systems and cells
BATT.CODE
Battery system design tool with interfaces for ecosystem design and system‑level simulation
eDLP
The world’s largest independent high‑voltage battery development and test center
BESS database
Comprehensive database covering more than 250 stationary storage systems from leading manufacturers
FEV CycleBat
Tool for assessing the circularity of different BESS designs and evaluating life-cycle costs, including maintenance, repairs and recycling
Build‑up workshop
Workshop for prototype build‑up and commissioning of prototypes and small series

FEV's battery development and testing center eDLP — FEV's HV battery development and testing center "eDLP"

Product Development: BESS service portfolio

Technology roadmapping
Market & competitor analysis
Strategies & business cases
Regulation & financing
M&A and due diligence

Design benchmarking
Cost benchmarking
Cost & value management

Use-case simulation & dimensioning
Turn-key BESS development
E/E integration
Software development

Performance, durability & abuse testing
Validation of grid codes & regulation

Prototype build-up
Permitting support
On-site commissioning

Circularity strategies
Design-for-circularity
Life-cycle-assessments
Regulation analyses

Case Studies: Examples

Published on February 24, 2026BESS, Case studies, Client Solutions, Industrial parks, Technologies
FEV and Regout Group Collaborate on Smart Energy Management through PV–BESS Integration
The Regout Group, a leading industrial manufacturer in Maastricht, aims to enhance sustainability and reduce energy costs. With rising electricity prices and the need for greener operations, the challenge was to identify an optimal mix of renewable energy generation and…
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Published on May 11, 2025BESS, Case studies, Technologies
Reference ESS FMEA project
Support and assessment for European ESS Integrator to meet certification criteria by performing FMEA/PFMEA and risk analysis…
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Published on May 13, 2024BESS, Case studies, Technologies
Modular battery concept for off-road machinery and stationery energy storage system
Client is considering to become a battery ack supplier for off-road machinery & stationary ESS and needs support defining the battery concent & business case…
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Published on January 9, 2024BESS, Case studies, Technologies
Battery energy storage systems: Development, installation, and commissioning of 2nd life systems
Development and assembly of B2L energy storage systems (30 to 5.000 kWh) with different OEM modules…
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Published on November 14, 2022BESS, Case studies, Technologies
Target costing for stationary energy storage system
Customer wants to develop a new stationary energy storage system A target costing and cost reduction study was made to drive concept decisions…
Read more 1 min.