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tim2542(at)sbcglobal.net
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 Posted: Thu Jan 21, 2010 12:24 pm Post subject: E-bus load. |
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I'm having trouble getting my E bus load down to what I think are
acceptable levels. So given the following avionics what would be the
recommendation for the ones that should be feed by the E bus? It seems
like they all should except for the second comm and one EFIS maybe. The
EFIS panels will be switched separately.
Also I have been planning on using the Z 10-8, partly because of brown
out protection but also as an AUX power source. I once thought this
would also protect the avionics during start but now I see it does not.
(I dont mean to open this can of worms again, but most of the equipment
I have recommends against starting with the equip. on and I'm going to
follow that recommendation even though I believe Bob is right on this.)
Comments are appreciated.
2 ea GRT EFIS panels: < 2 amps each.
1 ea GNS 430W < 2 amps / 8 on transmit
1 ea second comm < 2 amps on transmit
1 ea transponder 1~ 1.6 amp
1 ea Auto pilot 1 amp nominal, up to 3 in turbulence
1 ea Audio panel < .5 amp
Panel lights 1 amp or so
Eng info sys < .5 amp
Ignition sys (batt bus) 1 amp
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nuckolls.bob(at)aeroelect
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| Posted: Thu Jan 21, 2010 7:42 pm Post subject: E-bus load. |
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At 02:20 PM 1/21/2010, you wrote:
| Quote: |
I'm having trouble getting my E bus load down to what I think are
acceptable levels. So given the following avionics what would be the
recommendation for the ones that should be feed by the E bus? It
seems like they all should except for the second comm and one EFIS
maybe. The EFIS panels will be switched separately.
|
Keep in mind that the "e" in e-bus is ENDURANCE. Just because
you don't have some piece of equipment available on the e-bus
doesn't mean it's not available to you ever. You can always
close the battery contactor and run any other accessory that's
on the main bus. The only time you'd ever have to do this is
if you had TWO failures (alternator + some electro-whizzy)
on the same tank of fuel. Further, by keeping the endurance
value at or below the capacity of the SD-8, the ENTIRE energy
content of the battery is held in reserve for approach to landing.
Suggest the list be pared down as follows
| Quote: | Comments are appreciated.
1 ea GRT EFIS panels: < 2 amps each. 2.0
1 ea GNS 430W < 2 amps / 8 on transmit 2.0
1 ea transponder 1~ 1.6 amp 1.6
1 ea Auto pilot 1 amp nominal, 1.0
1 ea Audio panel < .5 amp 0.2 (0.5 amps is
VERY loud!)
Panel lights 0.1 (get this
down to a couple of led floods)
Ignition sys (batt bus) 1 amp 1.0
|
This gets you down to under 8A continuous
Bob . . .
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