---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 10/19/20: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:39 AM - Re: Z102 w/AEC9005 (Eric Page) 2. 08:11 PM - Re: Re: Z102 w/AEC9005 (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 08:39:11 AM PST US Subject: AeroElectric-List: Re: Z102 w/AEC9005 From: "Eric Page" Trying again; I posted this ten days ago with no response... > I'm building a Kitfox that will probably use an auto-based engine conversion. I like the look of your Z102 architecture for its redundancy in engine electrical supply, as well as the auxiliary bus for pre-flight ground activities. But, I have a couple of questions: > > 1. Am I correct in my understanding that: > a) the auxiliary battery is normally paralleled with the main battery during engine start *and* during normal operation (bus voltage >13V) so that it can be recharged by the alternator? > b) the auxiliary battery will be isolated to engine-related functions only, if the bus falls below 13V? > > 2. The Z102 schematic shows a START CMD signal from the push-to-start switch to an AEC90XX Aux Battery Management Module (ABMM). The only thing like this that I can find is your AEC9005 series of Low Voltage Warning and ABMM devices. However, the AEC9005 schematic in this document... > > http://www.aeroelectric.com/DIY/LV_Warn_Fab_and_Install.pdf > > ...does not include an input for the START CMD signal. Is there another ABMM design on the drawing board, or does Z102 contemplate an iteration of AEC9005 with the addition of the START CMD facility? If the latter, then is it safe to assume that START CMD is simply a gate drive signal to the FET, diode isolated from the comparator output? > > 3. On the AEC9005 schematic linked above, what is the purpose of Zener diode Z118? Is it to protect the FET against excessive V(d-s) in case the contactor's flyback diode fails to perform, or is missing? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=498899#498899 ________________________________ Message 2 _____________________________________ Time: 08:11:03 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Z102 w/AEC9005 At 10:30 AM 10/19/2020, you wrote: Trying again; I posted this ten days ago with no response... Sorry 'bout that . . my bad. I've been pondering the 'step up' from Z101 to Z102 . . . not sure I'm all that enthusiastic about it. Help us understand the motivation for an AUX battery added specifically to support the engine. Your total electrical needs for comfortable flight are predictable and/or measurable. The amount of energy contained in a battery is similarly known. If you split duties of the two batteries for alternator-out operations, then your endurance is set by whichever battery gives up first. Z101 offers dual feed bus structures with opportunity for load shedding to a predictable level. THAT number drives the battery selection and maintenance protocol. That's one of the reasons I discontinued the IBMM . . . $cost of ownership$ for a second battery is significant especially when it's not a quantum boost to system reliability. Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-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/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-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.