nuckolls.bob(at)cox.net
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 Posted: Sun Mar 02, 2008 9:27 pm Post subject: Ignition control in a dual alternator dual bus system |
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At 01:30 PM 3/3/2008 +1100, you wrote:
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<leo(at)icn.usyd.edu.au>
Dear List,
I am currently designing the electrical system for my "all-electric" RV
10. I have been very happy with Bob's architecture for my RV6A which
worked beautifully the day my alternator died in the clouds.
I am looking at the Z-14 schematic which involves two batteries, two
alternators and a cross feed for starting and for electron sharing in
failure mode.
I note that there are no switching diagrams for mags or other ignition
systems on this diagram. I wondered what the implications for mag
switching were in this setup. Should they just have simple switches but
only turn on the impulse coupled mag for a start? If so, how serious are
the implications if the non-coupled mag is accidentally enabled at
startup? If I ran an electronic system on the left would you only turn
this on after start and again stick with impulse coupling on the standard
mag for the start.
I would be pleased to hear from anyone who has used this schematic as the
basis for their electrical system as to how they had handled the ignition
switching.
Thanks for your help.
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Leo, Why such a heavy, complex, expensive electrical system?
How about going with Z-13/8 and use the money you saved to
put at least one E-Mag on? Leave your impulse coupled mag in
place and replace the non-coupled with an E or better yet,
a P-Mag. Then, both ignitions can be ON for cranking. If
you ever have the coupled-mag crap, you can put the non-
coupled back on and wire it like Z-27. Make both ignition
switches a DPDT ON-ON (S702-3 or equal) from the get-go.
This will produce an exceedingly reliable system with
a minimum of cost and get you a really nice sparking
ignition for cranking.
Bob . . .
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