I worked as maintenance supervisor for over a year at a nursing home and I never had any problems with our generator.

we were required to run ours once a week and throw or trip the switch once a month. I rigged a meter up to the panel that it feed to get voltage measurements.

all was fine til we had an ice storm and that poor thing ran for about 9 hours than finaly it gave the ghost. talking about a erious issue when it is 25 outside and your healthcare provider has no power or heat at all that was a long and intresting night to say the least