Paul Tomblinwrote:
I know from harsh experience that keeping the airplane master on to
use a cigarette lighter adaptor runs down the plane battery pretty
damn fast, so that's not a good idea.


An external power receptacle (cig lighter) can be hard wired to the
battery. (with a fuse) or just use the alligator clips adapter that
comes with most inverters.

The master switch solenoid has a very high amp draw.