BACKUP POWER & AMF SIZING

Diesel Generator (DG Set) Sizing Calculator.

Size commercial and industrial emergency diesel generators (kVA) by evaluating essential running load, largest motor starting inrush transients, fuel consumption at 75% load, and AMF changeover panel ratings.

Step 1: Emergency Power Audit

Critical Backup Load Parameters

Total Essential Running Load

Single Largest Motor on Backup System

Motor Starting Mechanism

DOL causes 6× inrush current; Star-Delta reduces surge to 3×; VFD minimizes generator sizing.

Generator Reserve Margin20%

Recommended DG Set Rating

125kVA

3-Phase 415V Diesel Generator with CPCB-IV+ Acoustic Enclosure

Operational Loading65%Optimal DG longevity zone (60%–80%)

Rated Current174 Aat 415V 3-Phase

Fuel Consumption~27.5 L/hrat 75% load

AMF Breaker218 A4-Pole Incomer

Mains Failure Changeover:< 15 Seconds (Auto-Start AMF)

AMF Synchronization & Panel Engineering

Automatic Mains Failure (AMF) Panel: Microprocessor-based auto-start controller monitoring 3-phase KSEB grid voltage, frequency, and phase sequence.

Interlocking Protection: 4-Pole motorized changeover switch with electrical and mechanical interlocks to prevent utility backfeeding into the grid.