Sprinter heaters for cold nights(and days too)

if you are on "shore power" the inverter won;t be online. ( well for me and many other models)

it would be odd if your 120VAC from shore power is converted/ rectified to DC and then Inverted to AC at your outlet.
my limited knowledge shows a "pass through" for 120 shore power to the outlets- an automatic switch box selects shore power when available- when not available, mine will look for the generator


Mike