Cummins C150D5 150 kVA Diesel Generator Set

Overview

The Cummins C150D5 is a 50 Hz diesel generator set from Cummins Power Generation rated at 150 kVA (120 kW) for emergency standby and 136 kVA (109 kW) for prime power. It sits at the upper end of the compact B-Series range and is a common size for buildings, telecom hubs, water pumping stations and small industrial plants. The Cummins C150D5 suits loads that need more than 100 kVA but do not justify a heavier QSL9 machine. Cummins lists the set for Africa and the Middle East, Europe, India and Latin America, in both an unhoused open-skid version and a sound attenuated, weather protective enclosure.

Seven Star LLC supplies the Cummins C150D5 to contractors, facility owners and utilities across the Sultanate of Oman and the GCC, with engineering support from our Muscat office. We help buyers confirm the correct rating for their load, pick the enclosure, and gather the Cummins documents that consultants ask for in submittals.

Operating Principle

A diesel generator set converts the chemical energy in fuel into electrical power in two stages. In the engine, air drawn through the dry air cleaner is compressed by a top-mounted Holset HX35 turbocharger, cooled in the charge air cooler and admitted to six cylinders, where fuel delivered by an in-line Bosch A-Series pump ignites under compression. The crankshaft turns at a fixed 1500 rpm, which is the speed needed for a four-pole alternator to deliver a 50 Hz output. The alternator then converts that shaft power into three-phase electricity, with an automatic voltage regulator holding terminal voltage as load changes.

The control system closes the loop. On the Cummins C150D5, the standard PowerCommand 1.2 controller starts and stops the engine, monitors oil pressure, coolant temperature, battery voltage and alternator output, and shuts the set down on a fault. Because fuel delivery is mechanical rather than electronic, the engine is tolerant of variable diesel quality and is simple to diagnose in the field, which matters for sites far from a service workshop.

Engineering Design of the Cummins C150D5

At the heart of the set is the Cummins 6BTAA5.9-G6, a four-cycle, in-line, turbocharged and charge-air-cooled six-cylinder engine with a 102 mm bore, 120 mm stroke and 5.9 litre displacement. Cummins describes the 6B5.9 as offering the strength of the B Series in a smaller, lighter and more economical package with a compact envelope and very low heat rejection. A single poly-vee belt with a self-tensioning idler drives the fan, battery charging alternator and water pump, and spin-on fuel and full-flow oil filters keep routine service simple.

The engine is supplied by Cummins as a Coolpac package complete with radiator and air cleaner kit, rated for a limiting ambient of 50 °C. The rating card pairs it with a Stamford UCI274E alternator and the PowerCommand 1.2 control, and the European range includes both open and enclosed versions. Starting is from a 12 V system with a 55 A charging alternator, and lube oil capacity is 16.4 litres.

Key Features

The Cummins C150D5 combines a proven mechanical engine with a straightforward control package, and its main strengths are summarised below.

• Rated output of 150 kVA standby and 136 kVA prime at 50 Hz, according to the Cummins product page and rating card.
• Six-cylinder 6BTAA5.9-G6 engine with turbocharging and charge air cooling for strong load acceptance in a compact frame.
• In-line Bosch A-Series fuel pump operating at high injection pressure for cleaner combustion and lower emissions.
• Coolpac cooling package engineered and tested by Cummins, with a limiting ambient temperature of 50 °C.
• PowerCommand 1.2 control as standard for start, stop, metering and engine protection.
• Stamford UCI274E alternator matched to the engine output for the 50 Hz rating.
• Available unhoused for plant rooms or in a sound attenuated, weather protective canopy for outdoor sites.
• Published fuel consumption of 35 L/h at full prime load on the engine, helping operators size day tanks accurately.

Industrial Applications

In Oman the Cummins C150D5 is typically chosen for standby power in mid-size commercial buildings, schools, clinics, hotels and residential towers in Muscat, where a 150 kVA unit covers lifts, pumps, lighting and critical small power. It is also widely used on telecom and broadcast sites, at pumping stations for water distribution networks, and as prime power for construction camps and remote facilities in the interior where grid supply is weak or unavailable.

Oil and gas operators and contractors use sets of this size for wellsite accommodation, workshops and small process skids, while farms and food plants rely on them to protect cold rooms. For larger loads the Cummins 312/315 kVA diesel generator set built on the QSL9 platform offers the next step up, and remote start can be added with a DSE7320 auto mains failure controller. Seven Star LLC supplies the Cummins C150D5 to projects across Oman, Sohar, Salalah, Duqm and the wider GCC.

Technical Specifications

The table below summarises published data for the Cummins C150D5 from the Cummins product page, the 2025 Europe 50 Hz rating card and the 6BTAA5.9-G6 engine specification sheet.

Selecting and Installing the Cummins C150D5

Choosing between standby and prime use is the first decision for the Cummins C150D5. Standby ratings apply for the duration of a utility outage, while the prime rating allows unlimited hours on a varying load with a 10 percent overload capability, as defined by ISO 8528 and ISO 3046. Sites in hot climates should also review the cooling package against the 50 °C limit and provide adequate ventilation, especially for plant-room installations. For maintenance planning, it helps to keep wear items such as filters, belts, a Cummins 3283330 starter motor and the Cummins 3937025 fuel injection pump family in mind for older Cummins fleets.

How to Order

To request a quotation for the Cummins C150D5, send Seven Star LLC your formal RFQ with the required rating, voltage, enclosure type and site conditions. Our Muscat team will confirm the configuration with Cummins, advise on lead time, and provide the engine specification sheet and rating card for your technical file. Contact our power generation team for support anywhere in Oman and the GCC.