Mike Wills used the 2 motor cycle battery trick for the RV4.

The situation is you use both batteries for starting
and then, after a short while for charging purposes, you switch
one off for flying.

The other is kept in reserve in case of alternator or battery
failures. This probably puts a glitch on the main power bus when the
back up battery is switch in or out.

I will add a choke and large capacitor on the main bus to smooth
the glitch.

Paul


Just a suggestion,

Look into Aeroelectric Connection ---Robert Nucholls. Google for his
website. He is an aircraft electric Maven, involved with electronic
design for major manufacturers.

He has a constantly updated and updatable book which goes into most of
the concepts and problems of aircraft electrical systems. It includes a
multitude of schematics (circuit diagrams) ranging from the ridiculous
to the sublime, depending on what your desires are. His website also has
a plethora of references as well as blogs, bulletin boards etc.... easy
to get lost in.

A definitely recommended and perhaps required book.

Using an engine that is totally electrically dependent behooves us to be
more sophisticated in our electrical approach---- unless we have some
glider training.

Rich

Does he talk about chokes on the main avionics buss?

Two of these fit Mike's battery box. I am still not sure these
are the one's he used as the batteries where missing when I picked
up the airplane.

There are a bunch of equivalents out there yet to be researched.


Paul Lamar