Generator sets usually have different labels and tags placed in various locations that have information for that specific unit. While most of the information on these tags and labels is important , there are some tags that have key information required when buying/selling a generator.


The exact location of this tag will vary greatly depending on the manufacturer and model of the engine but it will always be on the engine portion of the generator set. This may be a laminated sticker or metal plate has been engraved. This tag will provide information like engine manufacturer, model, serial number, arrangement number/cpl and horsepower/rpm rating. 


The generator tag is typically easier to spot than the engine tag and can be found on the control panel or the generator body most of the time. This will have information like manufacturer, model, serial number, power, voltage, phase, HZ, amps and rpm. 


This is going to be the company that engineered the unit such as Cummins, Caterpillar, Detroit Diesel, Perkins etc… 


The model distinguishes a particular engine or generator from a line of other products the manufacturer makes. The model number or name usually consist of a series of numbers and/or letters. Model types usually distinguish engine displacement, number of cylinders, and design. 


This is a unique series of numbers and letters given to an engine or generator that is used in identifying a specific engine. The serial number is similar to a finger print, no two serial numbers will ever be the same.


The arrangement and Control Parts List number are important, especially when determining exact parts that were used in that engine. Parts like piston group, cylinder heads and fuel system can be determined from these numbers.


Horsepower is the most popular unit of measurement for engine power. Some tags will have engine power in KW. Rpm refers to the revolutions per minute the engine is making at the given advertised power.  


The power capacity advertises the displacement of the generator which is typically measured in KW units. 


The voltage will usually have two number sets. The first number is the line to neutral voltage and the second one is the line to line voltage. 


This is the number of voltage sources. The most common type are single and three phase generators. Three phase generators are more efficient because unlike single phase generators, the supply of power is linear and does not have peaks and dips. 


This is the basic unit of frequency that the generator operates at. Most generators in the U.S will operate at 60 Hertz. Outside the U.S most generators operate at 50 Hertz. 


Amperage is a measurement of the current or flow of electrons through a conductor.