yeah they are noisy but still i will always prefer generator on UPS ,,,,,,,,,,right now this generator works flawless for 3 years and in all that time it runs all my home dozens of lights and atleast 5 fans , further more fridge and deep freezer all at the same time ,,,,,,,,,,,,,switch off the deep freezer and i can use donkey pump as well ,,,,,,,,,,,,,about noise ,,,,,,,,,,i have noticed that this noice is not comming from alternator and engine ,,,,,,,means its not a mechnical noice ,,,,,,,,,,,,,,,i guess if we instal some bigger cylincer then we can reduce some noice ,,,,,,,,,,,i see these generator during assambling in china factories and came to know that there is nothing in these cylincers which can reduce noice ,,,,,,,,,,,,,,,but if we instal some car cylicer like Fx cylincer then may be engine will overheat,,,,,,,,,,,,,,if any guy have any experence of installing car cylincer on these generator then plz do share here ,,,,,,,,,,,,,,we want to make these gen super quite,,,,,,,,,,,,