A BESS container price without batteries is quoted per enclosure, not per kWh. Fit the same enclosure with 104.5 kWh or 100 kWh packs of the same outer dimensions and its price stays the same. What moves the price is the delivery scope: the enclosure only, or a battery-ready enclosure.
When people quote a BESS container price, they usually mean a complete system with cells, PCS and EMS installed, priced per kWh. Battery makers and integrators already have the batteries; what they buy is the enclosure. The sections below break down the two quotes, then take each price variable in turn.
What each delivery scope includes
| Delivery scope | Included | Supplied by you or the system integrator | Variables that move the price most |
|---|
| Enclosure-only (empty container) | Steel enclosure, insulation, coating, doors and seals, earthing and equipotential bonding; battery racks optional | Battery packs, BMS, PCS and EMS, plus subsystems such as liquid cooling and fire protection | Enclosure size and format, floor loading, insulation, corrosion category, number of doors, battery racks or not, quantity |
| Battery-ready | All of the above, plus the liquid-cooling loop and dehumidification, fire suppression and fire alarm, flammable gas detection and explosion venting, LV auxiliary distribution and lighting, DC combining and output terminals, enclosure-level monitoring and security, and the enclosure-level factory test | Battery packs, BMS, PCS and EMS | Cooling capacity and supply frequency, fire suppression and venting design, electrical scope |
Both scopes are built in the ETENZ factory and can be delivered under your brand. A battery-ready enclosure ships with everything installed except the battery packs and has passed its enclosure-level factory test; on site, the packs go in and are wired and commissioned. The item-by-item scope is on the BESS Enclosure Manufacturing and Integration page.
What drives the price of an empty BESS container
The 20 ft high cube (6058 × 2438 × 2896 mm) is the most common format for BESS enclosures: its outer dimensions and corner castings follow the ISO container standards, so it is booked as a standard container. Widen it to 2550 mm, or go beyond ISO length or height, and both steel and labor go up, while sea freight is charged as out-of-gauge cargo. How to choose between the two widths is covered in BESS Enclosure Design Requirements.
Typical 5 MWh class liquid-cooled enclosures weigh about 42 to 43 t fully loaded, so the base frame, floor and racks are designed to the pack weight and anchoring points. Heavier packs and more tiers mean more steel. Whether the quote includes battery racks makes a clear difference to the unit price; if it does, send the pack datasheet and ETENZ draws the envelope from it, so the racks and the enclosure fit the first time.
Insulation material and thickness follow the lowest and highest site temperatures. Corrosion protection is specified to ISO 12944, from C3 to C5: the higher the category, the more coats and the greater the total film thickness, and the interior can be one or two categories lower than the exterior. The number of doors follows the rack layout: where packs are loaded through doors on the long side, each extra door adds a frame, seals and locks.
What a battery-ready enclosure adds
Liquid cooling and fire protection are selected per project, and the price follows the configuration. The chiller is sized from the heat load the battery supplier gives and the site ambient temperature, and chosen for a 50 Hz or 60 Hz supply. On the enclosure side, liquid cooling runs up to the quick coupling on each pack; the cold plates and the circuit inside the pack belong to the pack. For chiller options, see the end-wall BESS chiller.
The suppression agent, detection and interlock logic, whether a water sprinkler system is added, and the explosion vent area are configured to the project specification and the local fire code, so the same enclosure with a different fire protection design carries a different price.
LV auxiliary distribution, lighting, DC combining and the output terminals are built to your single-line diagram, and enclosure-level monitoring and security come with interfaces for the BMS alarm signals and the EMS communication protocol. Before shipment, the enclosure-level test covers the pressure test of the liquid-cooling loop, chiller operation and the fire protection interlocks, and the records come with the documentation package.
Separate lines in the quote
CSC design approval is charged once per design, covers every unit built to that design, and is listed as its own line. The ETENZ 20 ft high-cube design has RINA type approval, CSC included, for a maximum gross mass of 50 t, so empty enclosures of that design are booked as standard containers.
Series orders start with a first-article enclosure; once assembly and interfaces are confirmed, the series is built to the same process. The first article and the series are priced separately.
Indicative prices are given EXW Shanghai and formal quotations FOB Shanghai; ocean freight and insurance from there are arranged by your forwarder.
Lead time depends on quantity and scope
Lead time is stated in the quotation according to quantity and delivery scope. For the grid-forming storage project in Zhongwei, Ningxia, ETENZ built 143 enclosures of the 20 ft, 5 MWh class to one set of drawings and one process baseline, from the start of production to the last delivery in 40 days.
An indicative price in three working days
Send the battery pack datasheet and the destination, and ETENZ returns an indicative price EXW Shanghai within three working days. Once the pack data, capacity and quantity, delivery scope, destination and standards, and branding requirements are all in, the formal quotation follows against the drawings; how to prepare these five categories is set out in the BESS Enclosure RFQ Checklist.
When you compare quotes from several suppliers, line up the delivery scope, the separate lines and the trade terms item by item before comparing unit prices. How to tell whether an enclosure maker is reliable is covered in How to Choose a BESS Enclosure Supplier.
Frequently asked questions
How much does a BESS container cost without batteries?
It is priced per enclosure and depends on the delivery scope and what is installed inside. Send the battery pack datasheet and the destination, and ETENZ gives an indicative price within three working days.
Why is a BESS enclosure not priced per kWh?
The cost of the enclosure follows the steel it takes and the liquid cooling and fire protection fitted inside, not the battery capacity. Priced per kWh, the same enclosure would change price with every change of battery pack.
What is the difference between a BESS enclosure and a containerized BESS?
A BESS enclosure is the enclosure itself, plus whatever liquid cooling, fire protection, LV distribution and monitoring the delivery scope includes. A containerized BESS is the complete system with cells, PCS and EMS installed. The first is priced per enclosure, the second usually per kWh.
How does an empty BESS container differ from a battery-ready enclosure?
An empty container is the steel enclosure with insulation, coating and doors, with battery racks as an option. A battery-ready enclosure has liquid cooling, fire protection, LV and DC systems and monitoring installed in the factory and has passed its enclosure-level factory test; on site, the packs go in and are wired and commissioned.
If your data are ready, submit an RFQ; if you only have the battery pack datasheet, send that first.
