OLJK = DPDT? Make before break? The only web reference to OLJK
points back to us! The idea of a capacitor to keep power going during
a battery switch cycle is an interesting idea. How big of a cap would
we need to survive a 1sec loss of power with a 500ma load allowing for
a 1VDC drop?

I personally use the two (fused) batteries in parallel approach and
haven't had any issues at all. But am toying with the two batteries
and two switches (three counting a master) approach. A late winter
project. That and replacing all my connectors with powerpoles. I
REALLY like these modular connectors which come in a myriad of
colors.

One thing to note. Before a speech I gave at the 2007 SSA convention
on "Soaring Avionics Wiring" I wanted to know if flight recorders
would survive a temporary power outage while switching batteries. So
I wrote to every manufacturer and found that all except the
Volkslogger will easily survive several seconds of lost power. PLUS
they each will keep the same log file intact. A "small" gap in a log
file is legal as long as it is obvious that it is the same flight.
This has more to do with a lost GPS signal than a power outage but the
effect is the same.

My $0.02.

- John DeRosa