When on shore power, the electricity goes through a Mastervolt 7KW isolation transformer, through the Amel auto transfer switch, and into the 230V AC panel, including all breakers.  If shore power is 60Hz, all the breakers get 60Hz.  

When on generator power, the electricity feeds all breakers.

When on inverter power, the electricity feeds only the bottom two breakers: microwave and outlets.

There are no switches or anything for the crew to worry about.  The inverter can be left ON or OFF at all times, if you wish, because it has an autoswitch.  Everything is automatic given any of the three above conditions.  

There is one switch, however, for use in 60 Hz countries:

If on shorepower 60 Hz and one desires to use a 50 Hz appliance such as the microwave, espresso machine, blender, iron, mixer, toaster, hair dryer, portable heater, etc., one must open the access door above the sink and turn OFF the little yellow 32A breaker located on the side of the 230V AC panel.  This kills shore power to the panel, so the inverter can feed clean 50Hz power to our 50Hz devices.  Alternatively, you could go to the aft lazarette and turn off 32A breaker where shore power first comes into the boat, but we never do that.

Cheerio,

Peregrinus

SM2K #350 (2002)

At anchor off of El Rompido, Piedras river, Spain