Shore power to Gen power on the fly Question, Im stumped !!
Your ATF Automatic Transfer Switch protects the electrical panel from receiving power from both. The ATF rest on shore power and when the generator is started it takes precedence and the ATF switches to generator power, on most units you can hear a clunking sound shortly after starting the generator when the switch engages.
By design the ATF will switch to generator power while still connected to shore power, however, this is not a recommended practice because when you start the generator with the ATF energized by shore power the contacts will arch which will cause pitting of these contacts leading to the premature failure of the switch.
I always disconnect shore power before stating the generator and only start the generator with no load and turn off all the loads prior to stoping the generator to minimize wear to the ATF.
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Mike & Helen
2014 Voltage 3895 EPIC III
2013 Ford F350 CC DRW FX4
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