Inverter Generators
Inverter Generators are generators who posess an AVR, an AVR is an automated voltage regualtor which can controll the voltage from an generator.
Emergency power generators
Emergency generators are generators made for power outages, that means that it can provide you with power whilst there is an power outage so that you wont lose progress on important documents or your server wont abruptly working due to the loss of power and damage your disks.
Diesel Generators
Diesel Generators as said in the name run on Diesel, because they run on diesel they can generate more power but they also produce some more noice because of the stronger motor.
Gas Generators
Gas generators are generators that run on Gas to work such as propane and natural gas. These type of generators are more quiet but have the same performance than diesel generators.
Dual Fuel Generators
Dual fuel generators are like the name already describes generators that can run on 2 seperate types of fuel, most commonly is the duo with Gas and Diesel for the best possible performance.