---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 12/28/18: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:06 PM - Re: Schottky Diode (Peter Pengilly) ________________________________ Message 1 _____________________________________ Time: 03:06:20 PM PST US From: "Peter Pengilly" Subject: RE: AeroElectric-List: Schottky Diode Hello Bob & all, thanks for your replies. I am reluctant to go to LiPos as I have a ready supply of =91gelcels=92 (or whatever they are really!) I know it could be dumb to avoid spending a couple of hundred =A3=A3/$$ on a $100K aircraft, but if I can make the gelcels work I would like to. Getting the system working on the bench is probably a good idea, I have nearly all the equipment to hand so should get something running in a week or two. At present I am inclined to use a plain on-off switch on all the batteries, and to switch the 2 main batteries and the fin battery on together at the start of a flight, I should have a minimum of 8.5 hrs endurance with the engine battery available if required. A single main battery is not possible due to the battery trays provided by the manufacturer ' this is a certified aircraft, but the electrical system is not well defined (no circuit diagram provided as almost all installations are bespoke). The engine battery is used only to extend the engine into the airflow, run a fuel pump used during starting and to run the control box. Extend/retract cycle times are typically 5 to 7 seconds. The control unit has a 7.5A c/b, so that must be approximately the max current. Yes, it is a large battery for the task, but it fits the battery tray and is a certified system (circuit diagram provided this time!) so I am loathe to mess with it. This is a top level description of the system https://www.schempp-hirth.com/en/individual/engine-options/turbo-sustaine r-e ngine.html. Once I have measured the load for each item I will report back. Regards, Peter The equipment list is (current draw assumes 12v): Item Current (mA) Notes LX Nav LX9000 glide computer 500 Max brightness Flap positioner 30 Provides flap angle - always operating Trig bridge 20 Interfaces to radio Remote stick 20 Multi-function stick top V8 electric vario 150 Sensitive rate of climb +much more Vario audio 50 estimate Power FLARM Core *** 165 Proximity warning Oudie (PDA running gliding s/w) 150 estimate - on-board battery Radio Trig TY91 *** 240 Unknown speaker load Transponder Trig TT21 *** 420 Likely to be off for some of flight TOTAL 1745 Entries marked *** have an unpredictable duty-cycle, load may vary From: owner-aeroelectric-list-server@matronics.com On Behalf Of Robert L. Nuckolls, III Sent: 28 December 2018 03:03 Subject: Re: AeroElectric-List: Schottky Diode 4. Since knowing your exact loads are a bit more critical than a typical a/c, rather than look at mfgr data sheets, consider directly measuring each item's current in actual operation. Most data sheets will show you a conservative number, to be sure the installer doesn't 'short change' the device's needs. BINGO! 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.