Gas Generators Description
Generators run on various fuels and are available in different power categories depending on how much power is needed from running a small setup to supporting the needs of a whole building with their power generating rankings in kVAs, the higher the number prefix the more powerful it is. A generator is essentially an engine that is connected to an alternator that produces electricity through a process called electromagnetic induction. Gas generators are great if your requirement includes a generator that won't be making insane amounts of noise and something that is putting out lesser pollution. Also being a little cheaper on the running cost as gas is a cheaper form of fuel, but higher initial cost which is something that can be made up for in a while of running by saving on fuel expenditure.
The downside with gas generators is that they aren't as robust and have more parts that can go bad so general maintenance can possibly be higher which is why regular changes of the engine oil and air filter keep the generator running better. What generator works for you depends on how much power you need it to produce and the larger ones naturally consume more fuel to produce more electricity.