Overview#
The Doosan G325 delivers 260 kW of prime power (325 kVA) from a Cummins QSL9-G8 8.9-liter engine, stepping into the large portable class at 14,000 lbs. The 480-gallon integral fuel tank and 1,000A main breaker support sustained high-demand construction and temporary power operations.
At this power class, the Doosan G325 competes directly with Atlas Copco QAS 330 and MQ Power DCA-300 — typically pricing 15-30% below both while using the same Cummins engine platform that rental fleet service departments know well.
Cummins QSL9 engine and large-frame serviceability#
The G325 steps up to the Cummins QSL9, an 8.9-liter inline-6 that is one of the most widely deployed large-displacement diesels in the portable power industry. The QSL9 is used across multiple generator brands at the 250-350 kVA class, which means service technicians are familiar with the platform and parts availability is excellent.
The 1,000A main breaker supports high-amperage loads common on large commercial construction sites — tower cranes, concrete batch plants, and large temporary HVAC systems. The 480-gallon integral fuel tank provides enough capacity for sustained multi-day operations without frequent refueling.
Our service experience#
OnPoint services Cummins QSL9-powered generators across multiple brands in Northern California. The QSL9 is a proven workhorse at this power level — robust, well-supported by Cummins distributors, and straightforward to service. The G325's enclosure provides adequate service access for the larger engine, and the 500-hour oil change interval keeps maintenance predictable. For fleet operators at the 300+ kVA class, the G325's Cummins standardization means the same filters, fluids, and procedures used on other QSL9-powered units in the fleet.
