FAQ — Battery Storage for Commerce & Industry

Four factors decide: energy (kWh), required power (kW), site conditions and operating strategy. For smaller commercial sites, GRES cabinets are usually the right choice; for higher demand peaks, longer peak-shaving windows or larger energy throughput we look at BRES systems up to container scale. For a first assessment, a rough description of consumption, peak load and application is usually enough — reliable sizing follows with load-profile and site data.

About peak shaving →

Link to this answer: Which SCU storage system fits my load profile?

GRES (commercial storage) are compact outdoor cabinets from the GRES-75-50 up to the GRES-300-150. They need no container, stand on a concrete foundation and are the right choice for single sites between 50 and 150 kW. BRES (battery energy storage system) covers the larger all-in-one and container systems: the BRES-240-125 is a compact BESS, the BRES-480-250 an all-weather container, the BRES-720-375 a 10 ft container, the BRES-1200-625 and BRES-2400-1250 are 20 ft and 40 ft containers. PCS, climate control, BMS and protection are integrated — suitable for industry, charging parks, utilities and grid-related applications. Above that sits the FICTion series: fully immersion-cooled 20 and 40 ft systems with 2.08 or 4.16 MWh for MW-scale projects.

Link to this answer: What is the difference between GRES and BRES?

For peak shaving, power and duration of the demand peak count separately. Rule of thumb: the higher the peak to be shaved and the longer it lasts, the more storage power and usable capacity are needed. We include a safety buffer because demand peaks rarely repeat identically. The peak-shaving page gives a first orientation; final sizing is done with load profile, grid connection and operating strategy.

To the peak-shaving page →

Link to this answer: What storage size do I need for peak shaving?

Yes. GRES cabinets are paralleled on the AC side — typically two to four units at a common point of connection. BRES containers are coupled via the integrated EMS or a supervisory SCADA. Up to 4 MWh, several BRES-1200-625 or one BRES-2400-1250 with an extension container are the usual architecture; alternatively, the immersion-cooled FICTion-4160 delivers up to 4.16 MWh in a single 40 ft container. Above 5 MWh it becomes project-specific — talk to us.

Sizing enquiry →

Link to this answer: Can I cascade several SCU storage systems?

All SCU systems use LiFePO₄ cells. The GRES series is designed for ≥ 5,000 full cycles, the BRES series for ≥ 6,000. At one cycle per day that is roughly 13 to 16 years — provided temperature, charging windows and operating strategy fit. The binding warranty terms, residual-capacity values and service levels are stated in the quotation and the service contract. That is why we size systems not only by kWh, but also by expected cycle count, ambient temperature and operating profile.

Link to this answer: What is the service life of SCU storage systems?

Which verifications apply depends on voltage level, inverter power, point of connection and operating mode — typically VDE-AR-N 4105 for low voltage and VDE-AR-N 4110 for medium voltage in Germany. The final scope (application rule, unit certificates, NS protection, plant certificates) is set by the grid operator during the connection process. We clarify the verification chain before the connection request and deliver the manufacturer documents directly to electrician and grid operator.

Link to this answer: Which VDE standards do SCU storage systems comply with?

Yes. Every grid-connected storage system must be registered with the responsible distribution system operator, regardless of size. Which documents are required depends on grid level, power, operating mode and DSO requirements. For larger plants or medium-voltage connections, plant certificates, protection concepts and register entries are added. We provide your electrician with the necessary model documents and clarify early which verifications the specific point of connection requires. In addition, every storage system must be registered in the Bundesnetzagentur's Marktstammdatenregister within one month of commissioning.

Link to this answer: Do I need approval from the grid operator for a commercial storage system?

The point of connection is the interface between the customer installation and the public grid. VDE-AR-N 4105 typically applies in the low-voltage grid, VDE-AR-N 4110 in the medium-voltage grid. Storage power alone does not decide this — voltage level, generation/consumption mode, inverter, protection concept and grid-operator requirements all play a role. We therefore clarify the connection situation before the final selection of model, PCS power and verification package.

Link to this answer: What is the difference between a point of connection under VDE-AR-N 4105 and 4110?

For pure storage applications — self-consumption, peak shaving, backup power — metering law is not required. It becomes relevant as soon as energy from the storage is sold to third parties (charging-park operation with billing, direct marketing on the power market). In those cases we combine the storage with calibrated DC chargers compliant with German metering law (geeicht) or a calibrated metering point. Raise this before sizing so that the MID or PTB path is chosen cleanly.

Link to this answer: Are SCU storage systems compliant with German metering law (Eichrecht)?

Available interfaces depend on the specific model. GRES systems and the BRES-240-125 are listed with RS485 and CAN; the BRES-480-250, BRES-720-375, BRES-1200-625 and BRES-2400-1250 with RS485, LAN and Modbus TCP. Available registers, control commands and monitoring functions are checked against the model documentation and the requirements of the existing EMS. Cloud monitoring and gateway scope are defined in the quotation or the service setup.

Link to this answer: Which energy-management interfaces does the BMS offer?

Yes — the BRES-1200-625 is a 20 ft ISO container with 1,206 kWh nominal capacity and 625 kW PCS power. Dimensions 6,058 × 2,438 × 2,591 mm, weight approx. 16 t per the product datasheet. Climate control, BMS, PCS and protection are integrated; on site you need a foundation, grid connection, transfer station and data link. For smaller applications there is the BRES-720-375 in 10 ft format, for large projects the BRES-2400-1250 in a 40 ft container.

Link to this answer: Is there a battery storage system in a 20 ft container?

A reinforced-concrete slab is standard, dimensioned for the actual container weight per the current datasheet plus a safety factor. We supply an installation drawing with load points and anchor positions per container type. Screw foundations are possible if the subsoil allows; in seismically active regions we recalculate per project. Earthing in line with the applicable wiring standards (in Germany DIN VDE 0100-540) is mandatory.

Link to this answer: What foundation does a container BESS need?

Yes. All BRES models are IP54-protected and designed for outdoor installation. The operating temperature range is −20 °C to +55 °C; the integrated air conditioning keeps cell temperature in the optimal window. What the site adds: minimum distances per the site-specific fire-safety concept (as a guide, the German BVES safety guideline cites 5–10 m to buildings and other fire loads; smaller distances are possible with structural fire-protection measures, agreed with the fire authority and property insurer), a paved access road for commissioning and free ventilation for the cooling units.

Link to this answer: Can BRES containers be installed outdoors?

BRES containers come with multi-level monitoring and integrated protection: temperature, smoke and gas monitoring, BMS shutdown, alarm forwarding and — depending on the model — a suppression or extinguishing system. Which verifications, test reports and fire-safety distances ultimately apply depends on site, building code, insurer and fire brigade. We supply the manufacturer documents in full; the fire-safety concept is coordinated per project with all parties.

Link to this answer: What fire protection does the container provide?

Up to the BRES-1200-625 (approx. 16 t, 20 ft), transport by standard semi-trailer is usually possible; the BRES-2400-1250 (approx. 28 t, 40 ft) requires heavy-load equipment and, depending on vehicle combination and route, a permit or exemption for oversize/heavy transport (Sec. 29(3) / Sec. 46 German Road Traffic Regulations, StVO) — usually obtained by the carrier. Lithium storage systems fall under ADR class 9 (UN 3536) — we handle transport with ADR-certified carriers including all accompanying documents. Whether a building permit is required depends on the federal state, the site and the duration of installation — a permanently installed container generally counts as a structure even without a foundation; we clarify this early with the local building authority.

Link to this answer: Which transport routes and permits are needed for a container BESS?

GRES systems and the BRES-240-125 are listed with RS485 and CAN. For the BRES-480-250, BRES-720-375, BRES-1200-625 and BRES-2400-1250, the catalogue lists RS485, LAN and Modbus TCP. Which data can be read and which functions can be controlled must be checked against the documentation for the specific model. EMS, SCADA or control-centre requirements are clarified before integration.

Link to this answer: Which communication protocols do SCU storage systems support?

In most projects, yes. Decisive are model, interface, communication requirements and the existing control system. Modbus TCP, CAN or gateway connections are tested against the target system during the project. The scope of register list, parameterisation and commissioning support is fixed in the quotation or the integration concept.

Link to this answer: Can an SCU storage system be integrated into an existing EMS or SCADA?

The systems can be delivered with a cloud gateway and monitoring portal. The portal shows live values for SoC, SoH, cell voltages, temperatures, active/reactive power and alarms. Historical data, export functions and alarm routes are defined in the monitoring setup or service contract. Service-relevant events — climate, BMS, protection messages — can be forwarded directly to operator, control room and service partner on request.

Link to this answer: How does cloud monitoring work?

Yes, we often plan PV, storage and charging infrastructure together. We look at how PV generation, grid connection, charging power and storage strategy interact at the transfer point. Depending on the project, the EMS coordinates PV self-consumption, peak shaving and charging priorities. The right storage and PV size follows from load profile and grid connection.

Charging park + storage →

Link to this answer: Can SCU storage be combined with PV and charging infrastructure?

Warranty and service scope are defined per project and contract. Cell warranty, system warranty, residual-capacity terms, maintenance intervals and response times are stated bindingly in the quotation, the manufacturer documents and the service contract. For projects in Germany we plan service, spare-parts availability and remote support from the quotation phase. Short response times or defined spare-parts stocking can be agreed as a separate service level.

Link to this answer: What warranty and service does SCU offer?

Eligibility depends strongly on the use case — PV self-consumption, process energy, charging infrastructure, energy efficiency and direct marketing run under different programmes. In Germany, KfW 270 is an option for renewable-energy projects; KfW 295 and regional programmes are checked individually per site — they do not fit every storage project. One rule almost always applies: apply before placing the order. We are happy to give a first funding assessment and name the points to clarify with bank, funding body or tax adviser.

Request a funding check →

Link to this answer: Which funding programmes can be combined for commercial storage?

That depends strongly on load profile, demand charge, storage size and operating strategy. Peak shaving pays off above all when demand peaks are short, recurring and expensive. PV self-consumption, charging-park buffering or market-price windows improve the business case further, but must be netted out properly. A reliable payback calculation is therefore always done with your real site data.

More on peak shaving →

Link to this answer: How fast does a commercial storage system pay off through peak shaving?

In principle yes, provided power, metering, controllability, availability and prequalification fit. In practice, marketing runs via an aggregator or direct marketer who pools several plants and coordinates prequalification with the responsible transmission system operator. Whether a specific SCU system is suitable for FCR or aFRR is decided by PCS power, EMS, communication link, site and marketing model. Revenues fluctuate strongly with auctions and market prices — reliable figures belong in a project-specific calculation.

Link to this answer: Can SCU storage systems participate in the balancing-energy market?

Candidates are PV self-consumption, peak shaving, charging-park buffering, market-price windows and, in larger projects, balancing energy via an aggregator. Which combination makes sense follows from site, energy contract, metering concept and EMS. Prioritisation is mandatory — the storage cannot serve every revenue stream at maximum simultaneously. Until technology, marketing and contract model are fixed, we treat additional revenues as a scenario, not a promise.

Link to this answer: Which revenue-stacking strategies are possible?

System prices are available on request. Depending on the project, the overall budget also includes transport, civil works and foundations, electrical installation, protection equipment, commissioning, EMS integration and, where required, a transformer station or medium-voltage connection. The relevant cost components depend on the site and grid connection. The scope and project costs are clarified during the technical review.

Discuss project scope →

Link to this answer: Which costs should a storage project budget include?

SCU Group Europe is an importer and distributor. We supply the systems, advise on capacity, power and application, and prepare the quotation and product documentation. Installation is carried out by qualified electrical contractors or local partners. Grid connection, transport, installation, commissioning and on-site responsibilities are agreed for each project.

About SCU Group Europe →

Link to this answer: Who supplies and installs the battery storage system?

Your name and email address are enough for an initial enquiry. A short description of your application helps us assess the project. If available, you can add the site, grid connection, required power or storage capacity, timeframe and whether load-profile data is available. Missing details can be left open; technical sizing follows once the load profile, site data and operating strategy are available.

Discuss your project →

Link to this answer: What information does SCU need for an initial project enquiry?

Yes. Start by describing what the storage system should do, such as reduce demand peaks, increase PV self-consumption or support a charging park. Load-profile data is optional for the initial enquiry. For reliable sizing and an assessment of project economics, we then clarify which measurement and site data is still needed.

Discuss your application →

Link to this answer: Can I enquire without a complete load profile?