On 11/20/2021 7:51 AM, Jeff Scott wrote:
If flight is going to be dependent on electrical power, I'd rather use a
standby alternator than a standby battery. For the same weight, it makes an
emergency into a mere inconvenience.
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I think Jeff and I both said about the same thing on engine driven pumps
with electric backup.
As for my system with backup battery and all electric fuel supply
system, I can, and do, keep my very small 4AH battery charged with
alternator output during flight. My options are, 1. pumps run on main
buss with alternator charging, 2. main buss / no alternator, 3. backup
battery with alternator charging, 4. backup battery / no alternator, and
either or both pumps from either or both tanks. I take 10 seconds to
check my backup system before each engine start and failure is a "no
fly". I can pump my tanks dry with backup battery alone as I've done on
the ground during maintenance. My entire backup system with switches,
breakers, wire, battery, etc., probably goes about 6 pounds total,
equivalent to a backup alternator with no moving parts.
That's my system. Each of us goes with what makes us comfortable.
Larry Flesner
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