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All Updated Guides
Online vs Offline UPS (Topology Differences)
Online vs offline UPS differences: transfer time, protection, and when each topology fits—free comparison with sizing links.
Read Full ArticleUPS Battery Maintenance 101 (Test & Replace)
UPS battery maintenance 101: impedance tests, DoD planning, and replacement checklist for VRLA strings—free schedule with formula.
Read Full ArticleUPS Sizing (Free Guide — kW/kVA, Runtime, Battery & Redundancy)
UPS sizing: match kW/kVA to load, runtime, and battery needs with free factory examples. Step-by-step guide plus UPS load, capacity, and battery calculators.
Read Full ArticleTransformer Derating Formula (kVA ÷ k_t×k_alt — 127 kVA Ex.)
Transformer derating formula: nameplate kVA ÷ (k_temp×k_alt×k_h)—127 kVA example. Free guide; not cable ampacity. Open the sizing calculator.
Read Full ArticleSolar Transformer Capacity Check (750 kVA Example)
Check solar transformer capacity: max(PV, load, reverse)×margin with harmonics—750 kVA example. Free guide + sizing calculator.
Read Full ArticleTransformer Sizing for Harmonic Loads (K-Factor and Non-Linear Loads)
Transformer sizing for harmonic loads for electrical engineers and designers: K-factor and non-linear load sizing, THD derating, and VFD/UPS examples.
Read Full ArticleTransformer Tap Changer Faults (OLTC & OCTC)
Identify and prevent common transformer tap changer faults. Free OLTC/OCTC symptoms, causes, and maintenance checklist for 3-phase units.
Read Full Article3-Phase Transformer kVA Formula (√3·V·I + Examples)
3-phase transformer kVA: √3×V×I formula with 400/480 V examples. Free guide—verify instantly with the transformer size calculator.
Read Full ArticleTransformer Voltage Regulation Formula (%Z & Secondary VD)
Calculate transformer voltage regulation with %Z and load PF—480 V worked example. Distinguish regulation from conductor voltage drop.
Read Full ArticleOLTC vs OCTC Tap Changer (13.8 kV Cost Example)
OLTC vs OCTC: outage rules and cost at 13.8 kV. Free decision table—when on-load tap changers pay off for 3-phase plants.
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