After 40 years and still an RV tech, the ONLY practice I would follow is, Shut the LOAD (AC and such) OFF, then kill the Genset. Start the Genset. wait for Transfer from the ATS, Then start you AC units. The reason is, The Contacs on the ATS take a beating when starting and stopping on a LOAD. I have yet to see a failure of a Inverter or a Genset that COULD be attributed to shutting down under load. Cooling a AIR COOLED genset, I can see the advantage to running 5 minutes before shut down. But, a WATER COOLED Genset, I see no reason, any more so that running your Auto for 5 minutes before shutting it off. Inverter(Large) have cooling fan/s, so I see no reason to worry about them. Doug
