Why 20ft and not 40ft
A 20ft unit fits within standard road transport regulations without oversize permits and allows expansion to be staged in 5–6.9 MWh increments. A 40ft container means higher transport cost, more difficult siting, and a larger loss if a single unit fails.
Dimensions, weight, and foundation requirements
| Parameter | Value |
|---|---|
| External dimensions | 6.06 × 2.44 × 2.90 m |
| Weight with cells | 30–38 t |
| Footprint | 15 m² + service zone |
| Foundation load capacity | min. 2.5 t/m² |
| Container spacing | min. 3 m (subject to fire safety expert approval) |
How much MWh fits in a 20ft container today
The 314 Ah cell generation delivers 5.0–5.6 MWh in a 20ft unit. 628 Ah and 1,130 Ah cells raise capacity to 6.25–6.9 MWh in the same footprint, lowering land and construction cost per MWh.
Corrosion protection class and performance in the Polish climate
C4H is standard for inland sites, C5-M for coastal locations. The operating range is -30…+55°C, and a liquid cooling system with a heating function keeps cell temperature within the 15–35°C window regardless of outdoor conditions.
Fire protection and gas detection
- Combustible-gas detection at module level — response before ignition
- Aerosol or gas-based fire suppression with zone segmentation
- Emergency ventilation with explosion-proof dampers
- Design reviewed and approved by a certified fire safety expert