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1. 01:37 AM - Re: Re: Is there any reason to have a separate battery and alt switc (Brian Davies)
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| Subject: | Re: Is there any reason to have a separate battery and |
alt switc
=9CAssuming a constant load=9D=94a very rare condition in
an aircraft.
Brian Davies
From: owner-europa-list-server@matronics.com <owner-europa-list-server@matr
onics.com> On Behalf Of William Daniell
Sent: 13 May 2020 19:00
Subject: Re: Europa-List: Re: Is there any reason to have a separate batter
y and alt switc
My voltage is a steady 13.8 so going back to my school electricity assuming
a constant load and constant voltage the amps should be constant as well.
My second ammeter on the bat + fat wire shows a consistent charge once the
starting energy has been recovered.
In any case I will follow your advice and measure V and A with a separate i
nstrument.
thanks
Will
William Daniell
LONGPORT
+1 786 878 0246
On Wed, May 13, 2020 at 9:25 AM Gilles Thesee <gilles@elixir-aircraft.com <
mailto:gilles@elixir-aircraft.com> > wrote:
Le 13/05/2020 =C3- 14:52, William Daniell a =C3=A9crit :
I have a 912 turbo with a skyview.
About once a flight my amps go up off the chart - 70a - ending up with a r
ed x on the screen (no sparks or smoke :-)). After which the instrument c
omes alive and the amps reduce to normal 7-10 depending on the load. And re
main normal thereafter.
When the amps are climbing the reading can be "reset" by turning off the al
ternator and then turning it back in again.
I have a hall effect sensor on the thick wire which charges the battery and
this changes very little as on would expect.
I asked the europa and the aeroelectric forums and dynon. Several people s
aid they had similar events. So having checked the wiring i assumed that
this was a dynon bug.
AND ....I always understood that the alternator was unable to produce more
than 18A hence people adding external alternator. But is thus a fair assum
ption?
Could it be a faulty regulator?
Will,
Understand your concern.
I'd say an ammeter is not very useful as a *cockpit* instrument. An alterna
tor is physically incapable of supplying more than its short-circuit curren
t (21A for the Rotax).
What counts is *voltage* : under 12V, no charging, above 13+ V, system is c
harging, above ~15V, overvoltage etc.
I cannot help you on the Dynon, since I never installed or used one, and ne
ver bothered to read its manual.
Nevertheless, anytime you have an odd looking *instrument indication*, the
first thing to do is check what the *actual value* of the indicated paramet
er is.
So the first thing to do is record or take note of the ship circuits voltag
e with an idependent instrument. If you don't have a panel voltmeter, your
VHF certainly provides a voltage indication. Otherwise you'll need a portab
le voltmeter or datalogger.
Only then will come the time to make assumptions as to what actually occurs
and what is at fault.
FWIW,
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
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