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bktrub@aol.com wrote:
I've recently found that a 40 amp alternator is not sufficient to run a
13B with electric fuel pumps and EFI. Seems the injectors take up a
huge amount of amperage at higher rpms. I'm fine on the ground,- at
about 13.7 volts, but when I'm running 5-6000 rpm, my voltage starts
dropping and stabilizes at a little below 12 volts after an hour of
flying. I have two 18 AH batteries. I"ve got a Dynon D10, terra 250
Transponder, Xcom radio, EC2, EM2, and two fuel pumps from RWS. I only
run one pump at a time except for takeoff and landing. Anyone know what
the current draw for the injectors is at 6000 rpm?
Looks like I need to add another alternator.
Dang-it!! Thank you for that report. I've been running fine on the ground doing run-ups. The biggest hit to the
batteries has been getting it started. My electric load is probably higher than yours, since I'm also running an EWP.
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