Operations

UPS Runtime Calculator

Sizing batteries for rack, ISP switches, NAS or home-lab gear — the flat, vendor-server model, honest about its limits.

Backup time at 60 W

120 min

≈ 2.02 hours · 121 Wh usable of 168 Wh nominal

Discharge current

5.56 A

at nominal voltage 12 V

Sizing guidance

Keep continuous load under ~80 % for lead-acid longevity (recommended max 108 W). Deep-cycling small SLA cells below 50 % DoD extends life considerably; high temperatures halve real-world capacity. Plan for the worst-case load, not the average.