Generator Sizing: 100 to 200
Standby and prime-rated diesel generator sizing data from 20kW to 2000kW per NEMA MG1 and ISO 8528-1. Includes standby vs prime kW, kVA rating, motor starting kVA (skVA), fuel consumption, altitude derating (3.5%/1000ft), and ambient temperature derating (3%/10C above 40C) per major manufacturer specifications.
| rating kw | alt derate pct per 1000ft (%/1000ft) | fuel consumption gph full load (gal/hr) | notes | phases (dimensionless) | power factor (dimensionless) | prime kw (kW) | rated kva standby (kVA) | rated voltage V | standby kw (kW) | starting skva (kVA) | temp derate pct per 10C above 40C (%/10C) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 100 | 3.5 | 8.5 | 100kW; most common commercial standby size | 3 | 0.8 | 90 | 125 | 120_208_240_480 | 100 | 700 | 3 |
| 125 | 3.5 | 10.5 | 125kW | 3 | 0.8 | 113 | 156 | 120_208_240_480 | 125 | 875 | 3 |
| 150 | 3.5 | 12.5 | 150kW | 3 | 0.8 | 135 | 188 | 120_208_240_480 | 150 | 1,050 | 3 |
| 175 | 3.5 | 14.5 | 175kW | 3 | 0.8 | 158 | 219 | 120_208_240_480 | 175 | 1,225 | 3 |
| 200 | 3.5 | 17 | 200kW; large commercial | 3 | 0.8 | 180 | 250 | 120_208_240_480 | 200 | 1,400 | 3 |
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