I suffer from severe sleep apnea, and while camping I needed to charge my RV batteries during the daytime hours. Due to the American Disabilities Act, I could run my generator at night to power my CPAP(continuous positive airway pressure) machine, but why needlessly disrupt others.
I built an enclosure to reduce the noise of running my generator at campgrounds. There are two short videos. The first is without the noise reduction enclosure, and the second with the enclosure. Both video's compare running at "no load" and then adding 1500 watts of load. Notice that you can hear the birds over the sound of the enclosed generator.
Due to updated technology, I now power my CPAP with a lithium battery that will power the machine for 3+ nights of sleep. I do occasionally still run my enclosed generator during non-quiet hours to recharge the RV batteries.