1. National Standard Requirement: Battery Room Thresholds Shall Be Equipped with Rodent Barriers
The GB/T 51048-2025 Design Standard for Electrochemical Energy Storage Power Stations specifies:
Ventilation openings, penetrations, doors, cable trenches, and other openings connected to the outdoors shall be provided with protective measures against rain, snow, wind-blown sand, and small animals. Door thresholds shall be equipped with rodent barriers.
The conventional solution is typically:
Standard Door + Metal Rodent Barrier
However, rodent barriers are designed only to prevent small animals from entering. They cannot stop rainwater backflow, stormwater flooding, or flood intrusion.
For Battery Energy Storage System (BESS) facilities located in coastal areas, riverside regions, or low-lying sites, water entering the battery room may result in equipment damage, system shutdowns, electrical short circuits, corrosion, and insurance claim disputes.
Battery room thresholds should not only provide rodent protection—they should also provide flood protection.
2. FM Approved Flood Door: An Upgraded Alternative to Traditional Rodent Barriers
Shanghai Weiwang's FM Approved Flood Door can be installed at battery room entrances, providing dual protection at the same threshold.
1) Upgrading Traditional Rodent Barriers
- The bottom sealing system forms continuous contact with the floor.
- Minimizes gaps beneath the door to prevent rodents and small animals from entering the battery room.
- Serves as an upgraded alternative to conventional rodent barriers.
- Suitable for battery rooms, electrical rooms, control rooms, and other critical equipment areas.
2) Providing Flood Protection
- FM Approved, with waterproof performance verified by an internationally recognized third-party certification body.
- Designed to protect against heavy rainfall, flash flooding, and rising external water levels.
- Offers significantly greater protection than conventional rodent barriers when used at battery room entrances.
- Certification documents, installation drawings, and inspection records are available to support project reviews and insurance verification.
3. Why Do BESS Facilities Need FM Approved Flood Doors?
Traditional rodent barriers solve the question of whether rodent protection is provided.
FM Approved Flood Doors go one step further by addressing whether the battery room entrance has a verifiable flood protection capability.
4. Typical Applications
- Battery room entrances in standalone BESS power stations
- Energy storage projects in coastal, riverside, or low-lying areas
- Commercial and industrial energy storage facilities
- Electrical rooms, control rooms, PCS rooms, and other critical equipment rooms
- Projects requiring enhanced flood resilience and insurance compliance
5. Conclusion
Battery rooms are among the highest-value and highest-risk areas within a Battery Energy Storage System.
With increasingly frequent extreme weather events and the implementation of updated national standards, conventional rodent barriers alone are no longer sufficient to meet the risk management requirements of high-standard projects.
Shanghai Weiwang's FM Approved Flood Door transforms a traditional rodent barrier into a comprehensive flood protection solution.
One Door. Dual Protection—Rodent Prevention and Flood Defense.