Description
The APS-RTx PowerLine Flex PL31-BR20120FL provides a complete external battery solution for compatible PL31 PowerLine Flex 6kVA and 10kVA long-run UPS systems.
The battery pack contains 20 × 12V 9Ah maintenance-free VRLA batteries, factory arranged to provide the ±120VDC battery configuration required by the compatible UPS.
With approximately 2.16kWh of nominal battery energy, the PL31-BR20120FL provides stored energy for maintaining critical loads when utility power is unavailable. Actual UPS runtime depends on the connected load, battery condition, operating temperature and UPS efficiency.
Its compact 3U rack-mount design allows the battery pack to be installed alongside the UPS in standard server, communications and equipment racks, creating a clean and integrated backup-power installation.
The battery pack is particularly suitable for applications where the PL31 FL 6.0k HC or PL31 FL 10.0k HC is supplied as a long-run UPS without internal batteries.
Key Features
- 20 × 12V 9Ah internal VRLA batteries
- ±120VDC battery system
- 240VDC total series battery voltage
- Approximately 2.16kWh nominal battery energy
- Designed for PL31 FL 6.0k HC
- Designed for PL31 FL 10.0k HC
- Complete external UPS battery pack
- Maintenance-free sealed VRLA batteries
- Compact 3U rack-mount design
- Suitable for standard equipment and server racks
- Integrated battery enclosure
- Designed for long-run online UPS applications
- Typical battery recharge to 90%: 6–8 hours
- Typical battery design life: 3–5 years, depending on operating conditions and discharge cycles
- Suitable for critical IT, communications and business applications
Compatible UPS Models
| UPS Model | Capacity | Compatibility |
|---|---|---|
| PL31 FL 6.0k HC | 6kVA / 6kW | Compatible |
| PL31 FL 10.0k HC | 10kVA / 10kW | Compatible |
Typical Applications
Suitable for battery backup systems supporting:
- Servers and server rooms
- Data centres
- Network infrastructure
- Telecommunications equipment
- Banking and financial systems
- CCTV and security systems
- Access-control infrastructure
- Business-critical IT systems
- Communications racks
- Industrial control systems
- Automation equipment
- Medical support equipment
- Branch IT infrastructure
- Critical office systems
Technical Specifications
| Specification | PL31-BR20120FL |
| Product Type | External UPS Battery Pack |
| Battery Technology | Maintenance-Free VRLA |
| Battery Quantity | 20 pcs |
| Battery Rating | 12V 9Ah each |
| Battery System Voltage | ±120VDC |
| Total Series Voltage | 240VDC |
| Nominal Battery Energy | 2.16kWh |
| Configuration | 1 × 20 batteries |
| Enclosure | Rack-Mount Battery Cabinet |
| Rack Height | 3U |
| Compatible UPS Capacity | 6kVA & 10kVA |
| Compatible UPS Models | PL31 FL 6.0k HC / PL31 FL 10.0k HC |
| Typical Recharge Time | Approx. 6–8 hours to 90% |
| Typical Battery Life | 3–5 years depending on use and environment |
| Operating Temperature | 0–40°C |
| Relative Humidity | 0–95% RH, non-condensing |
| Dimensions | 443 × 720 × 131 mm (W × D × H) |
| Net Weight | 63 kg |
Battery Capacity
The PL31-BR20120FL contains:
20 × 12V × 9Ah = 2,160Wh
This provides approximately 2.16kWh of nominal stored battery energy.
Actual usable backup energy and runtime will be lower and will vary depending on:
- UPS load percentage
- Battery age and condition
- Ambient temperature
- UPS conversion efficiency
- Battery discharge characteristics
For this reason, UPS runtime should be calculated based on the actual connected load rather than nominal battery energy alone.

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