Should you buy a new or used diesel generator, and which brands are recommended?
New diesel generators carry manufacturer warranties and the latest emissions technology but command higher prices. Used or rebuilt units can cost 30-60% less and are often available immediately; they suit backup or noncritical applications. Buyers should verify running hours, maintenance records, emission compliance, loadbank test results and overall condition. Leading brands include Cummins and Caterpillar, known for reliability, durability and strong service networks. Perkins, MTU and Yanmar supply engines used in many industrial gensets, while Kohler and Generac offer commercial generators with low harmonic distortion and quiet operation. Depco inspects and loadbank tests all used units in its inventory, offering customers peace of mind and customization options.
Related Questions
What are the pros and cons of new vs used units?
New generators come with full warranties, the latest emissions technology and zero operating hours. They are ideal for mission-critical application where downtime is unacceptable. However, new units cost more up front and may have longer lead times.
Used or rebuilt generators can cost 30-60% less and are often available immediately. They are well-suited for backup or non-critical applications. The tradeoff is that used units have accumulated hours and may lack modern emissions controls. Ensure that the generator has been thoroughly inspected, serviced and tested under load.
Which brands make reliable commercial diesel generators?
Leading manufacturers include:
- Cummins: known for reliability, quick load acceptance, low emissions and a global service network.
- Caterpillar (CAT): offers a wide range of diesel gensets from 6-kW to over 5,700-kW; CAT generators are valued for durability, efficiency and advanced control systems.
- Perkins / MTU / Yanmar: produce high-quality engines used in various industrial generator sets.
- Kohler / Blue Star / Generac: provide commercial and industrial generators with features such as low harmonic distortion, quiet operation and EPA compliance.
What should you look for when buying used?
When evaluating a used diesel generator:
- Total running hours: low hours can indicate less wear; however, ensure hours are genuine and not a meter reset.
- Maintenance records: review service logs for oil changes, loadbank tests and repairs. Units with documented maintenance typicallly have longer remaining life.
- Emission compliance: check whether the engine meets current emissions standards (Tier 2, 3 or 4). Upgrading older units may be costly.
- Loadbank test results: a prepurchase loadbank test verifies that the generator can deliver its rated output without overheating or producing excessive smoke.
- Physical condition: inspect for leaks, rust and worn hoses; test the automatic switch and control panel.
Does Depco offer certified used diesel generators?
- Yes. Depco’s inventory of diesel generator sets includes rebuilt and used units from trusted brands. Each unit undergoes mechanical inspection, loadbank testing and servicing. Depco can also customize fuel tanks, enclosures and switchgear to meet specific facility requirements.
By understanding how diesel generators work, their advantages, limitations, maintenance needs and regulatory requirements, commercial buyers can make informed decisions about backup and prime power solutions. When you’re ready to explore inventory or get expert advice, contact Depco to discuss the best diesel generator for your facility.
