---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 05/26/22: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:24 AM - Re: Antennas (Bobby Paulk) 2. 07:52 AM - Re: Power-Sonic LiFePO4 (Hypersport) (Patrick Brannan) 3. 08:48 AM - Re: two-battery, fuel pump circuit protection (Patrick Brannan) 4. 04:51 PM - Re: Re: Antennas (rd2) ________________________________ Message 1 _____________________________________ Time: 04:24:17 AM PST US From: Bobby Paulk Subject: AeroElectric-List: Re: Antennas As an old analog guy in a digital world I don't understand why an antenna on a hangar is prohibited. I had several on the outside of my hangar including a ham 3 element beam, a TV, and aircraft band. What is the 704 megaCYCLE antenna for anyway. Bobby Old Geezer ________________________________ Message 2 _____________________________________ Time: 07:52:04 AM PST US Subject: AeroElectric-List: Re: Power-Sonic LiFePO4 (Hypersport) From: "Patrick Brannan" Eric Page wrote: > Curious... the battery that you tested appears to have been discontinued and replaced with the PALP-50N18LAHY (Hyper Sport Pro). There is no mention on Power Sonic's website of the PAL50N18L-AHY (Hyper Sport). Comparing the datasheets... > > OLD: https://www.power-sonic.com/wp-content/uploads/2019/02/PAL50N18L-AHY-technical-specifications.pdf > > NEW: https://www.power-sonic.com/wp-content/uploads/2021/05/PALP-50N18LAHY.pdf > > ...shows a capacity drop from 128Wh to 96Wh, and a weight drop from 4.63 lbs to 3.75 lbs. > > If the "2021/05" in the new datasheet's URL is a date, it would appear that the change to "Pro" happened just a few months after your tests. There are still a couple of the old model floating around out there. The shelf life on a lifepo stored properly is supposed to be at least 10 years, but I have no idea how was that verified. Be aware that the specified weight is incorrect. The real weight is a little over 6lb. That's probably where the extra capacity comes from. I forget the exact number. But it weighs more than 4.63 lbs. I believe that the demand for quality LiFePO4 powersports batteries is huge and PowerSonic is probably adjusting to this market rapidly. The powersports batteries market (infrequently used equipment in general) is massive. You can put lifepo in your motorcylces, lawn mowers, atv's etc and throw away your trickle chargers. Everything just starts. Every time. That doesn't necessarily make them all appropriate for aviation use. Just food for thought. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=507061#507061 ________________________________ Message 3 _____________________________________ Time: 08:48:04 AM PST US Subject: AeroElectric-List: Re: two-battery, fuel pump circuit protection From: "Patrick Brannan" johnbright wrote: > > You have not said what alternators you are considering for your single alternator dual battery system. > > No, I don't know why Note 24 in Aeroelectric Connection says "...In any case, the diode bridge should be located as close as practical to the critical systems input power connection." In Z101, feeds in and out of the diodes are short and infused. > I think the diode bridge being located close to the equipment is because the downstream wiring is a single point of failure. It also has two fuses in parallel feeding it. I'm not sure I've thought through all the ramifications of that setup. Maybe I have it wrong. I have the B&C LX60 with the LR3D-14 controller. I think it's best that backup battery is isolated from the charging system and main battery in normal operation. Putting an appropriate diode and fuse, SDS recommends 30A, between each battery and the engine bus seems like the best way to keep the backup online and feeding the engine regardless of what happens to the rest of the system. There also needs to be switches and / or relays to isolate the batteries for testing. Depending on the backup battery used, having a contactor or relay that allows the backup to be charged by the alternator and to provide emergency power to the field and critical equipment might be a good idea. I lean toward having two batteries, each capable of starting the engine. SDS makes a point that you cannot hand prop an engine with the SDS system installed. I'm assuming that means that if the prop stops in air, I will need to use the starter to get it going again. I need to verify this with SDS. At low altitude I would keep the aux battery contactor (the alternate feed to the main bus not the engine bus) off so that the only thing the backup battery can do is run the engine. The 20 or 30 amp, self-exciting backup alternator is tempting. But I'm not sure it's justified in this case. I have inverted oil system that picks up oil from the vacuum pump pad. That's all set up already. I know that there is an adapter that can pull oil even if a vacuum pump is installed, but not sure it's worth the effort and do not know how oil flow might be affected. Two batteries, each of which will keep the plane in the air for at least one hour, seems adequate. I just have to make sure that the pilot knows when there is a failure. Preflight will include checking the charge levels of both batteries. Regarding your defrost, I've had two "interesting" experiences with canopies frosting over. Once in a sailplane and once in an A-6. It's one of those things you don't think about until it all goes wrong. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=507062#507062 ________________________________ Message 4 _____________________________________ Time: 04:51:26 PM PST US From: rd2 Subject: Re: AeroElectric-List: Re: Antennas Antenna on hangar - too lengthy to explain limitation based on convoluted interdependencies between airport authority, FBO and tenants. In this case similar to asking your FSDO to approve taking your handheld GPS along. (Say what ???!!!). So, ask no more :) As far as 704 mhz - it's the cell freq of my IoT box SIM card to turn on/off engine heater, battery charger etc. remotely via my cell phone. IoT is mainly for less frequent control, costs in my case $50/yr. ----- Original Message ----- From: Bobby Paulk Sent: Thu, 26 May 2022 07:23:41 -0400 (EDT) Subject: AeroElectric-List: Re: Antennas As an old analog guy in a digital world I don't understand why an antenna on a hangar is prohibited. I had several on the outside of my hangar including a ham 3 element beam, a TV, and aircraft band. What is the 704 megaCYCLE antenna for anyway. Bobby Old Geezer ------------------------------------------------------------------------------------- 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.