---------------------------------------------------------- Europa-List Digest Archive --- Total Messages Posted Thu 05/14/20: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 01:37 AM - Re: Re: Is there any reason to have a separate battery and alt switc (Brian Davies) ________________________________ Message 1 _____________________________________ Time: 01:37:56 AM PST US From: "Brian Davies" Subject: RE: Europa-List: 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 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 > 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 -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message europa-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Europa-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/europa-list Browse Digests http://www.matronics.com/digest/europa-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.