Online UPS.

Choose double-conversion online UPS for medical, broadcast and mission-critical loads — line-interactive introduces a 4–10 ms transfer gap that accumulates as failures over time. Line-interactive UPS uses a transfer switch that introduces a 4–10 ms gap when the grid drops. For most office equipment that gap is invisible; for medical devices, broadcast servers, fire-alarm panels, switching-mode power supplies running tight tolerances and any equipment with sensitive transformers, that gap registers and over time accumulates as failures. Double-conversion online removes the question: there is no transfer event because there was never a switching path. We use line-interactive only where the load can genuinely tolerate it.

UPS battery autonomy is typically 10–15 minutes for buildings with diesel backup, 30–60 minutes for IT loads without generators, longer for critical-care clinical loads. Sized to the longer of two windows: the time your generator takes to start and stabilise, plus a 50% safety margin; or the time the load needs to shut down cleanly. For most buildings with diesel backup that means 10–15 minutes of UPS battery; for IT loads without generator backup 30–60 minutes is typical; for critical-care clinical loads we size to longer windows with redundancy.

Choose lithium-ion for new UPS deployments above 20 kVA — 3–4× cycle life, half the floor space and 30–45% lower 8-year lifetime cost than VRLA. 3–4× cycle life, half the floor space and a fraction of the maintenance versus VRLA. Initial cost is ~2× but lifetime cost is typically 30–45% lower over 8 years. For new installations above 20 kVA we almost always recommend lithium. For sub-20 kVA loads with short autonomy requirements, VRLA remains acceptable.

Online UPS AMC scope includes quarterly preventive checks, annual full discharge test, firmware patching and a board spares pool — with response under 4 working hours within Guwahati metro. Capacitor inspection, fan-bearing health, internal-temperature trend, log review, battery-bank impedance test (or BMS report for lithium). Annual full discharge test. Firmware patching on schedule. Spare-board pool for the modules in your rack. Response targets in writing — under four working hours within the Guwahati metropolitan area; structured around scheduled rotations elsewhere.

Yes — we coordinate UPS with the diesel set and ATS as one engagement, treating the whole power chain as one system rather than three contracts. We coordinate the UPS with the building's diesel generator and automatic transfer switch as part of the same engagement — runtime calculations, ATS logic, harmonic-load coordination and the documented start-up sequence. The whole power chain is treated as one system rather than three contracts.

Yes in most cases — a careful audit of UPS firmware, charging-curve and communications interface tells us whether the existing UPS supports lithium without replacement. A careful audit of the UPS firmware, charging-curve compatibility, communications interface and physical mounting tells us whether the existing UPS supports lithium. Many recent generations of Vertiv, Delta and Fuji modules do. We provide the audit report before quoting; if the UPS itself needs replacement we will say so.