pitts_pilot(at)bellsouth.
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 Posted: Wed Dec 30, 2009 8:12 am Post subject: loading the buss(s) |
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DLM wrote:
> --> RV10-List message posted by: "DLM" <dlm46007(at)cox.net> (dlm46007(at)cox.net)
>
My point was to split some distributed loads (like lights) so as to not lose ALL of an item if you have failure of one buss or the other.
Phil's observation was a good one .... don't put all your eggs in one frying pan. 
> How about two buses and all each appliance to its own breaker; then
> make all breakers pull able or toggle able.
I went with two fuse blocks. One fuse block feeds power to each item mounted on the instrument panel, and is attached to the panel.
The other fuse block feeds power to all the items mounted on the airframe, and is attached to the airframe, so I really don't have a true essential buss ..... yet. I contemplated splitting power for the glass panels and radios (two each) ..... but since I only have one ships battery and a backup battery for each glass panel ..... I dunno. I have alarms for diminished charge current and voltage so I'll know instantly when the alternator or main battery goes offline.
My panel is completely removable through plugs/sockets or, in the case of main power feeds, a screw (or two .... I'm not done yet!).
Be careful ..... a lot of the 'pullable' breakers aren't meant to be used as a switch.
> With everything selectable on either bus trim can be on either bus and still be useable.
That's a lot of redundancy! And expensive! A complete redundant electrical system is the next step up! I think of the essential buss as just that .... powering the minimum that I need to safely fly the airplane if I 'lose something'.
> My avionics master is a toggle able breaker.
> The single alternator can push power to the essential bus through a
> power diode or through an avionics breaker which connects the two
> buses. The alternator can get its excitation voltage from the
> essential bus battery instead of the main battery if off line. That
> way I still have control over the electric fuel pump for landing as
> well as any other appliances which may be needed for only a short
> time or after landing.
I'm only interested in getting to the closest airport ..... I'm not interested in having all the 'nice' stuff, like landing lights or boost pump. I can land without them. All I really need is my GPS to find the airport, and the equipment to do an IFR approach if necessary. And I can even do without a radio if necessary.
>
> --
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