When an APC UPS reaches low battery runtime (e.g., <2 minutes), it sends a shutdown command to connected systems. By default, most servers enter state. In S5:
| Use Case | APC Model | Key Feature | |----------|-----------|---------------| | Single server, budget | Back-UPS Pro BR1500G | Serial port (not just USB) | | 1-2 servers, small office | Smart-UPS SMT1500C | Built-in NMC slot (AP9630) | | Rackmount, multi-server | Smart-UPS SMT2200RM2U + AP9631 | Outlet groups + scripting | | Data center | Smart-UPS SRT5KXLT + NMC | Environment monitoring + WoL trigger scripts | apc ups wake on lan best