It's clear that there's a good sized learning curve behind the RV-12 avionics so I bought Van's' White Lightning ground power unit so I can sit in the plane and play with the avionics without draining the battery. The installation question is whether it should be wired to the output side of the battery contactor (I'm leaning that way) or the input side. With the output side, you can power the airframe without draining the battery because you don't turn on the battery master. With the input side you get the benefit of recharging the battery without turning on the battery master.

I'm reluctant to do that because I don't know enough about recharging issues for the EarthX lithium battery.

In any event, it'll be a bear to get access to either side of the battery contactor so it'll wait 'til warming weather. -8 this morning in Minnesota.