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Cummins/Onan QSB5-G1 Generator Set

The Cummins/Onan QSB5-G1 is a 56 kW (70 kVA) diesel standby generator set powered by a Cummins/Onan QSB5-G1 engine. It operates at 50 Hz. It holds about 12.2 L (3.2 gal) of oil and 25 L (6.6 gal) of coolant, with a maximum ambient rating of 50 °C. The set measures 821×739×982 mm (32.3×29.1×38.7 in) and weighs about 352 kg (776 lb).

56 kW
Standby
4.5 L
Displacement
12.2 L
Oil capacity
2
Document types

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Typical fuel consumption for 55–60 kW Diesel generators →

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Specifications

Fueldiesel
Frequency50.0 Hz
Standby power56 kW
Standby kVA70
Prime power50 kW
Oil capacity12.2 L
Alternator100 amps
Coolant capacity25.0 L
Max ambient50.0 °C
Dimensions (L×W×H)821×739×982 mm
Dry weight352 kg

Engine

Cummins/Onan QSB5-G1
Displacement4.5 L
Rated speed1500 rpm

Service intervals

2
ItemActionHoursMonthsNotes
valve clearanceCheck2000 hrB-Series (4BT3.3): valve clearance checks not required for 2000 hours, twice the industry standard
engine overhaulOther20000 hrQSK23-Series: expected life cycle to 20,000 hours before first overhaul

Extracted from the manufacturer documentation linked to this model. Values are copied as printed; confirm against your unit's manual and serial number.

Common questions

What is the power rating of the Cummins/Onan QSB5-G1?

The Cummins/Onan QSB5-G1 is rated 56 kW standby (70.0 kVA).

What engine is in the Cummins/Onan QSB5-G1?

The Cummins/Onan QSB5-G1 is powered by the Cummins/Onan QSB5-G1 engine.

What kind of fuel does the Cummins/Onan QSB5-G1 run on?

The Cummins/Onan QSB5-G1 runs on diesel.

How much coolant does the Cummins/Onan QSB5-G1 hold?

The Cummins/Onan QSB5-G1 cooling system holds 25 liters (6.6 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

How much oil does the Cummins/Onan QSB5-G1 take?

The Cummins/Onan QSB5-G1 has an engine oil capacity of 12.2 liters (12.9 US quarts), per the manufacturer specification sheet.

What is the prime power rating of the Cummins/Onan QSB5-G1?

The Cummins/Onan QSB5-G1 is rated 50 kW prime (63 kVA), against 56 kW standby.

What is the dry weight of the Cummins/Onan QSB5-G1?

The Cummins/Onan QSB5-G1 has a dry weight of 352 kg (776 lb).

What alternator comes on the Cummins/Onan QSB5-G1?

The Cummins/Onan QSB5-G1 uses a 100 amps alternator.

Fuel consumption

RatingLoadL/hgal/h
Prime100%18.04.76
Standby100%21.05.55

Available documents

Spec sheet — QSB5-G1Reference — CUMMINS-GENERATOR-ENGINES-CATALOG (Cummins/Onan)

This page was generated from the 2 manufacturer documents above by automated extraction; every figure shown is copied from one of them. How the data is compiled.