[B and C]

I have a total newbie comment.  When running the generator I noticed the panel above the cockpit showed 240 V and the L1 light was on.  Nothing showed for L2.  I had the AC's and fridge on.  I expected to see something on L2 but?  I do not have volt or amp meters on the display.  My generator display is only oil pressure and temperature.  I need a lay mans explanation as to what I am seeing.  I admit to knowing very little about electricity and great respect for those that do.  Just trying to learn the best I can.
Thanks!