Most modern stationary (IE, permanently installed) gensets exercise automatically.
But yes, once a week "for a few minutes" isn't proper. Once a month for 20 minutes would be far better, and preferably under load. It's like people who start their motorcycle once a week all winter long and run it for 60 seconds thinking they're doing it a favour when in reality it's only making things worse.
But yes, once a week "for a few minutes" isn't proper. Once a month for 20 minutes would be far better, and preferably under load. It's like people who start their motorcycle once a week all winter long and run it for 60 seconds thinking they're doing it a favour when in reality it's only making things worse.