We got our 20KVA Diesel type Denyo from Kilton around 14 years ago and it's still running very smoothly. Before Basyang, the last time it ran was about 8 months ago and it started right up when we turned it on last week. i guess it helps when we regularly have it serviced at least once a year. We used to have a problem with the thing overheating because we housed it in a little shack, but that was quickly solved b putting in a coupe of exhaust fans for improved airflow inside the shack. extra tip: We also jury rigged a bell that sounds when the normal power comes on so that we know when we can switch it right back.