A Comprehensive Buying Guide to Top Generator Manufacturers: CAT, Cummins, Kohler, Blue Star, MTU, Detroit Diesel, and Generac

Facility managers are crucial to ensuring the smooth operation of various systems within a facility, including emergency power supply systems – having the best generator truly matters. When it comes to backup power solutions, the choice of generator is a critical decision. In this buying guide, we will delve into the similarities and differences between some of the top generator manufacturers: CAT (Caterpillar), Cummins, rehlko (Kohler), Blue Star, MTU, Detroit Diesel, and Generac.

CAT (Caterpillar) Generators

Caterpillar generators, manufactured by Caterpillar Inc., are globally recognized for their durability, efficiency, and reliability in power generation. These generators are designed to meet the needs of various industries, including construction, healthcare, agriculture, and commercial facilities. Caterpillar offers a wide range of models tailored for standby, prime, or continuous power applications.

Caterpillar’s commercial generator lineup includes diesel and natural gas models with power outputs ranging from 30 kW to over 2,000 kW. The Cat GC series is particularly popular for its cost-effective design and reliable performance in standby applications. These generators feature advanced voltage regulation, low fuel consumption, and compliance with stringent emissions standards. Models like the DE33GC and DE715GC cater to businesses requiring dependable backup power during outages.

For more robust needs, Caterpillar offers high-capacity units that deliver up to 1,750 kW of standby power. These generators are engineered for mission-critical operations in data centers and industrial facilities.

Caterpillar’s innovative features include remote monitoring systems like Cat Connect for real-time performance tracking and streamlined designs that reduce installation costs. With their proven reliability and advanced technology, Caterpillar generators remain a top choice for those seeking the best generator solutions.

Strengths:

• Renowned for durable and robust construction.
• Wide range of power outputs for diverse applications.
• Advanced control systems for efficient operation.

Considerations:

• Typically higher upfront costs.
• Requires professional maintenance.

Cummins Generators

Cummins generators are renowned for their reliability, efficiency, and advanced technology, making them a leading choice for commercial applications. Designed to provide dependable power solutions, Cummins offers a wide range of generator models tailored to various industries, including healthcare, data centers, and retail buildings. Their commercial lineup includes diesel, natural gas, propane, and even alternative fuel-powered generators, ensuring versatility to meet diverse energy needs.

Popular models include the Quiet Diesel series, which delivers low noise levels and exceptional fuel efficiency, and the Centum Series, celebrated for its compact design and sustainability. For mobile applications like food trucks or emergency vehicles, Cummins Onan generators provide robust power with minimal vibration. Larger commercial models like the 1250DFLC offer high output (up to 1250 kW) with advanced control systems for seamless operation.

For businesses seeking the best generator solution, Cummins combines durability, innovation, and global support to ensure uninterrupted power.

Strengths:

• Globally recognized for high-quality engines.
• Broad product line catering to various power needs.
• Excellent fuel efficiency.

Considerations:

• Parts and service readily available but may be more expensive.
• Regular maintenance is crucial for longevity.

Rehlko Generators (formerly known as Kohler)

Kohler Generators are renowned for their reliability and performance in both residential and commercial applications. Their commercial models range from 24 kW to 4 MW, catering to small businesses, industrial facilities, and critical infrastructure like hospitals and data centers. These generators are available in diesel and gaseous fuel options, offering flexibility for various operational needs.

Kohler’s commercial lineup includes single-phase and three-phase models, with features like advanced voltage regulation, low harmonic distortion, and quiet operation, making them suitable for sensitive electronics and noise-sensitive environments.

For businesses seeking the best generator for backup power, Kohler’s commercial models stand out due to their robust engines, corrosion-resistant enclosures, and compliance with EPA standards. Popular models include the 24 kW–60 kW range for small businesses and the larger 80 kW–150 kW units for medium-sized operations. With customizable options like automatic transfer switches and remote monitoring systems, Kohler ensures seamless power continuity during outages.

Strengths:

• Innovative design and technology.
• User-friendly controls.
• Emphasis on environmental sustainability.

Considerations:

• Generally mid-range in terms of pricing.
• Extensive dealer network for support.

Blue Star Generators

Blue Star Generators, manufactured by Blue Star Power Systems, are renowned for their reliability and versatility in commercial and industrial applications. These generators are available in diesel, natural gas, and propane models, with power capacities ranging from 20 kWe to 2000 kWe. Designed to meet stringent EPA standards, they offer environmentally friendly solutions while maintaining high performance.

For smaller businesses, Blue Star provides models in the 60-150 kW range, ideal for office buildings, restaurants, and apartment complexes. Larger enterprises can choose from units between 200 kW and 2 MW, which are robust enough to support critical operations in facilities like data centers or manufacturing plants. These generators are customizable to meet specific requirements and can be equipped with advanced enclosures and accessories.

Blue Star’s commitment to quality makes them a top choice for those seeking the best generator for both standby and prime power needs.

Strengths:

• Known for customized solutions based on client needs.
• Emphasis on energy efficiency.
• Reliable performance in diverse conditions.

Considerations:

• May not have as extensive a global presence.

MTU Generators

MTU generators are globally recognized for their reliability, efficiency, and versatility in powering critical applications. As part of Rolls-Royce, MTU offers a wide range of commercial generator sets designed to meet diverse needs, from backup power to continuous operation. Their diesel and gas generators are engineered for maximum performance, low emissions, and long service intervals.

Diesel models like the MTU Series 4000 and Series 2000 are ideal for demanding environments, offering robust designs and exceptional fuel efficiency. Gas-powered options, such as the MTU Series 500 and Series 4000, provide sustainable energy solutions with advanced features like combined heat and power (CHP) capabilities.

These generators are used in industries such as healthcare, data centers, and manufacturing, where reliability is paramount. Whether you need a compact unit or a high-capacity system, MTU delivers some of the best generator solutions available today, tailored to meet specific operational requirements.

Strengths:

• High-performance engines with cutting-edge technology.
• Suitable for demanding applications.
• Robust and reliable under heavy loads.

Considerations:

• Premium pricing.
• Professional installation and maintenance recommended.

Detroit Diesel Generators

Detroit Diesel generators are renowned for their durability, efficiency, and reliability, making them a trusted choice for industrial and commercial applications. These generators offer a wide range of power outputs, from 200 kW to over 1,000 kW, catering to diverse energy needs. Popular models include the Series 60, available in configurations like the 275 kW and 350 kW Tier 3 diesel generators, and the powerful 16V149 model, which delivers up to 1,000 kW.

Known for their robust engineering, Detroit Diesel generators are equipped with advanced features such as electronic controls, fuel-efficient engines, and compliance with EPA emission standards. These qualities make them ideal for backup or prime power solutions in industries like construction, healthcare, and data centers. For those seeking the best generator for long-term use, Detroit Diesel offers reliable performance with minimal maintenance requirements, ensuring consistent power supply even in demanding environments.

Strengths:

• Strong focus on fuel efficiency.
• Known for long-lasting performance.
• Customizable options available.

Considerations:

• May not be as commonly found in all regions.
• Higher initial costs.

Generac Generators

Generac is a leading manufacturer of power solutions, offering a wide range of generators for residential, commercial, and industrial use. Known for their reliability and innovation, Generac generators are designed to provide seamless backup power during outages, ensuring critical operations continue uninterrupted.

For businesses, Generac’s commercial models deliver tailored solutions to meet diverse power needs. Their product lineup includes small kilowatt natural gas generators ideal for offices and warehouses, as well as large multi-megawatt systems for extensive facilities.

Generac’s Modular Power System (MPS) stands out for its scalability and redundancy, allowing businesses to expand power capacity as they grow. Additionally, their fuel options—diesel, natural gas, propane, and bi-fuel—offer flexibility while addressing emissions concerns.

Generac’s reputation as the provider of the best generator stems from its commitment to durability, efficiency, and advanced features like remote monitoring. With these attributes, Generac ensures businesses stay powered and protected in any situation.

Strengths:

• Market leader in residential generators.
• Cost-effective solutions.
• User-friendly controls.

Considerations:

• Primarily known for residential applications.
• May require more frequent maintenance.

A comprehensive search for the best generator isn’t complete without Duthie’s Guide to Backup Generator Sizing and Preparedness.

In partnership with an emergency power service provider like Duthie Power Services, it is crucial for facility managers to conduct a thorough analysis of the top generator manufacturers before making a decision. “Our recommendations to customers for new generator purchases are completely dependent on the customer’s needs,” says Duthie Power Services Sales Engineer Mike Goodman. “Choosing the right generator for a facility involves a careful evaluation of specific needs, budget constraints, and its intended purpose.”

Find the Best Generator for your Site

Corinne Rodriguez, Duthie Power’s Sales Manager, expands, “Each manufacturer has its unique strengths and considerations which we discuss with the facility managers and onsite staff who will be maintaining the generator.” Whether it’s the rugged reliability of CAT, the global recognition of Cummins, or the innovative solutions offered by Kohler, the choice ultimately depends on the specific requirements of the facility and the long-term goals of the organization.