wdaniell.longport(at)gmai
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 Posted: Wed Jun 10, 2020 9:35 am Post subject: Is there any reason to have a separate battery and alt swit |
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Well ...as a follow up to this I installed the three position switch OFF, BAT and BAT-ALTas recommended in the Z16. Low and behold, the amp reading issue seems to have gone away or at least before I was having about one event per flight and since 3 p[ositioon switch installed no events per flight.
Why would a three position switch be functionally any different from two separate switches?
William Daniell
LONGPORT
+1 786 878 0246
On Fri, May 15, 2020 at 8:11 PM Gilles Thesee <gilles(at)elixir-aircraft.com (gilles(at)elixir-aircraft.com)> wrote:
| Quote: | Le 15/05/2020 à 23:33, William Daniell a écrit :
Will,
There is a law in physics measurements : the more parameters you measure, the more you scratch your head^^!
That said, you wrote that your bus - or battery - voltage remained within the "green" limits during each of the events. So no reason to suspect the voltage regulator.
The only item capable of supplying more than the 21 amps of the alternator is the battery, but while doing this its voltage would sag due to internal resistance (Cf Ohm's law for a generator). 70 amp is no trifle.
So the main probabilty is an ammeter artefact. The best way to measure currents is with a Hall effect sensor, as the shunt may induce side effects in your circuits with high currents.
But first things first, without independent and reliable voltage and possibly current measurements or logging, no assumptions can be made.
Concerning disconnecting the battery while running, not sure it would be a safe thing to do, especially in flight :
[img]cid:1729f48fe02ee31c21b1[/img]
--
Best regards,
Gilles
http://contrails.free.fr
http://lapierre.skunkworks.free.fr
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