Generators are divided into various types, such as diesel generator, gasoline generator, portable generator, trailer generator, silent generator and industrial generator and so on. Diesel generator and silent generator are the most popular because their use is widely and have low fuel consumption. 

When you choose to buy a diesel generator, you need to compare products and know what is available to suit your needs. Will the generator be used a a primary source of power — or is it for emergency use only. 

When buying your diesel generator you should also consider how quiet you want it to be. If it is going to be situated near your house or business premises you will want a quiet generator. Air-cooled diesel generators tend to be louder, while liquid-cooled are quieter and more dependable.Safety should also be considered when choosing a diesel generator. Low oil pressure and automatic shutdowns will be standard on most generators.   

Besides, it is also important to consider the location where the generator will be used. In a remote location without access to commercially-generated power, a silent generator may be used as the main source of power for a cabin or a home. Some models are more convenient for this purpose because they are able to be hard-wired into a residential electric system. For outdoor use, where generators will be exposed to the elements, models with a rust-resistant finish are a better choice. Outdoor generators that are stationary can be further protected by the installation of a shelter. If, rather than having a fixed location, the generator will need to be moved from place to place, the size and weight of the generator is also worth considering. For portability, choose the smallest and lightest generator that will meet the anticipated power need.