Critical Power Guides for Facility Managers and Engineers

Practical guidance on UPS systems, generators, batteries, power quality, and data-center infrastructure, written by the team that installs and maintains them. No theory for its own sake. These are the questions we get asked on site.

VRLA battery life against battery room temperature: half life at 35 °C and a quarter at 45 °C, beside a CET technician working on an Ultracell battery rack

Why UPS Batteries Die Early, and the Habits That Double Their Life

Every 10°C above 25°C can halve UPS battery life. The temperature, load and testing habits that protect your battery investment.

kVA vs kW power triangle and a 10 kVA UPS delivering 10, 9 or 8 kW at power factor 1.0, 0.9 and 0.8, beside a rack-mounted UPS under test

kVA vs kW: Why Unity Power Factor Changed UPS Sizing

Modern UPS run at unity power factor (1.0), so kVA equals kW. Why that changed UPS sizing and how to compare quotes correctly.

Online double-conversion UPS block diagram: rectifier, DC bus, battery, inverter, static switch and maintenance bypass, beside a Riello UPS front panel

The Four Operation Modes of an Online UPS, and When Your Load Is Protected

The four UPS operation modes, and when each one earns its place Efficiency, protection, and the trade-off every critical-power decision comes down to.[…]

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