Key selection criteria include:Load requirements: Measure actual power draw in watts (not just VA), consider power factor (0.95-1.0 for modern IT), and plan for growth.Runtime needs: Match to business continuity requirements rather than rules of thumb.Topology: Online double-conversion is standard for mission-critical IT.Battery chemistry: Compare VRLA vs Li-ion based on TCO, not just upfront cost.Efficiency:...
Determining UPS runtime involves several key considerations:Generator availability: Sites with generators typically need 5-15 minutes runtime (enough for generator start). Sites without generators may need 30-60 minutes.Business processes: Consider time needed for orderly shutdown or remote orchestration.Load characteristics: Model runtime using vendor curves at your specific load level.Environmental factors: Verify assumptions against ambient temperature as...
The choice between Valve-Regulated Lead-Acid (VRLA) and Lithium-ion (Li-ion NMC or LFP) batteries involves several key differences:Lifespan: VRLA typically lasts 3-5 years at 77°F (25°C), while Li-ion offers 8-12 years.Temperature sensitivity: VRLA life halves for every 18°F (10°C) above 77°F; Li-ion tolerates heat better but still prefers 68-77°F.Energy density: Li-ion provides higher energy density, meaning...
