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Generac SG250 Specs (Power | Voltage | Weight)

Written by Ernie Lo in Specs Last Updated August 18, 2026

The Generac SG250 compressor is listed with standby output of 250 kW, Natural Gas fuel, 60 Hz operation, 120/208 V, 120/240 V, 277/480 V, 346/600 V output, Three phase, and sound level of 85.6 dBA @ 23 ft (7 m).

Generac Generator Specifications

Generator • Natural Gas • 60 Hz • Three phase

Standby power: 250 kWVoltage: 120/208 V, 120/240 V, 277/480 V, 346/600 VDry weight: 6,365 lb (2,887 kg)

Key specifications

250 kWStandby power
Natural GasFuel
120/208 V, 120/240 V, 277/480 V, 346/600 VVoltage
Three phasePhase
6,365 lb (2,887 kg)Dry weight
85.6 dBA @ 23 ft (7 m)Sound level
60 HzFrequency

Visual model specs

Built only from this model’s supplied generator specifications.

Power output
Low 225 kW High 250 kW
Standby

250 kW

Prime

225 kW

Fluid capacities
Low 9.06 gal High 18.99 gal
Oil

9.06 gal

Coolant

18.99 gal

Model spec snapshot
Representative numeric specifications from this generator.
250 kWStandby
6,364.75 lbWeight
85.6 dBASound

How the Generac SG250 compares

This compares the supplied numeric specification with Generac generators in the same broad standby-power class where enough comparable data exists.

Standby power
250 kW
In line with avg
46th percentile
Dry weight
6,365 lb
7% below avg
52nd percentile
Sound level
85.6 dBA
6% above avg
68th percentile
Oil capacity
9.06 gal
21% above avg
82nd percentile
Standby power250 kW
Low 150 kWAverage 255.7 kWHigh 375 kW

Very close to the similar-output Generac average. Around the 46th percentile for this field.

Dry weight6,365 lb
Low 2,844 lbAverage 6,845 lbHigh 12,362 lb

About 7% below the similar-output Generac average. Around the 52nd percentile for this field.

Sound level85.6 dBA
Low 68 dBAAverage 81 dBAHigh 93 dBA

About 6% above the similar-output Generac average. Around the 68th percentile for this field.

Oil capacity9.06 gal
Low 1.25 galAverage 7.51 galHigh 9.51 gal

About 21% above the similar-output Generac average. Around the 82nd percentile for this field.

This model Peer average

Generator information

Manufacturer Generac
Model SG250
Generator type Generator
Fuel Natural Gas
Frequency 60 Hz

Electrical output

Standby power 250 kW
Prime power 225 kW
Standby kVA 313.0
Voltage options 120/208 V, 120/240 V, 277/480 V, 346/600 V
Phase Three phase
Power factor 0.8

Engine, cooling and controls

Oil capacity 9.06 gal (34.3 L)
Coolant capacity 19 gal (71.9 L)
Maximum ambient 104 °F (40 °C)
Controller H-100, Power Zone Pro Sync
Alternator 520 (4-pole, Class H insulation)
Emissions EPA Certified Stationary Emergency

Physical specifications

Dry weight 6, 365 lb (2, 887 kg)
Dimensions (L × W × H) 138.7 × 57.6 × 68 in (3524 × 1463 × 1728 mm)
Sound level 85.6 dBA @ 23 ft (7 m)

Battery

Battery group 8D
Battery cranking 1155 CCA
Battery voltage 12 VDC V
Battery quantity 2

Disclaimer: Specifications should be verified against the official owner’s manual and confirmed on the Generac USA website.

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Ernie Lo

Ernie Lo is a qualified web designer and web developer. He works as an IT support technician and website manager at Benleigh Vending, and he also fixes vending machines.

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