---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Wed 03/13/19: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:01 AM - Starters (Steve Kelly) 2. 05:03 PM - Three Questions on Z-07 (markfw) 3. 05:34 PM - Re: Three Questions on Z-07 (John Morgensen) 4. 05:46 PM - Re: Three Questions on Z-07 (markfw) 5. 07:48 PM - Re: Three Questions on Z-07 (user9253) ________________________________ Message 1 _____________________________________ Time: 08:01:16 AM PST US Subject: AeroElectric-List: Starters From: "Steve Kelly" Can someone with more knowledge than me on the subject, tell me the difference between a series wound motor and a PM motor. Also, does the series wound have more torque. Is it more durable. I have a Skytech PM on my O-320 thats getting a little sluggish on the initial turn of the prop. While I'm aware that there may be other causes, confidence that my engine will start reliably is important. I have heard good things about B&Cs starters. While they're more expensive, I guess you get what you pay for. Steve -------- Steve Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488049#488049 ________________________________ Message 2 _____________________________________ Time: 05:03:06 PM PST US Subject: AeroElectric-List: Three Questions on Z-07 From: "markfw" I am building an electrically dependent LSA Carbon Cub. I will be using the SDS EFI system. I am currently planning to use Z-07 as the basis for my electrical system architecture. I have three questions: 1. Using Z-07 as drawn my Endurance Bus (E-Bus) load is only 4.0 amps, due to high efficiency avionics, and my MOTIVE Power Distribution Bus (MPDB) load is 14 amps due to the EFI. In an alternator-out situation if I run the MPDB on one battery and the E-Bus on the other, wouldnt I be wasting some of the E-Bus battery since its load is so much less than the load on the MPDB? Assuming that I want to keep the batteries the same size, would it be better to merge the MPDB and the E-Bus, keeping all connections the same? In the alternator-out scenario I would then shut down my MAIN Power Distribution Bus to shed load and drive the E-Bus with both batteries, perhaps through a single relay. In an earlier e-mail Bob said > During that discussion, we concocted the idea > of an ENDURANCE bus to (1) power a > minimally useful equipment list, (2) power > additional items easily turned off to shed > load and (3) have a battery energy path > around a de-energized battery contactor. Essentially it seems to me that with an EFI the whole MPDB could be treated as part of the E-Bus. I realize that I may be missing something here. 2. I have been looking at using a pair of EarthX ETX680 (PC680-equivalent) LiFePO4 batteries since they have a BMS that will post info to my GRT EFIS about their condition. I would like to use both batteries for starting as in Z-07. I have read that people like to separate their avionics bus from the starting battery because of a potential voltage drop during starting. However, the BMS on the EarthX batteries takes their output to zero if it drops below either 12.8v or 11.5v (both are stated in their on-line documentation). Since the EarthX batteries can demonstrably start Lycoming 4 cylinder engines without dropping off line, does this in fact imply that there is not a voltage drop below 11.5v on starting with them? Is this a difference between LiFePO4 batteries and lead acid batteries? 3. Can someone tell me what the DSS2XC61-01A is? Is it a diode? Thanks. Mark[/quote] Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488059#488059 ________________________________ Message 3 _____________________________________ Time: 05:34:09 PM PST US Subject: Re: AeroElectric-List: Three Questions on Z-07 From: John Morgensen I have a couple of years experience with the EarthX batteries and I have some positive comments: 1. The voltage should not drop during the engine start unless there is a dead stall. 2. In a single battery installation, the battery is sized to the alternator output. A 70 amp alternator should have an EarthX900. I would ask EarthX about 2 batteries. 3. I almost tested the BMS by leaving some electronics on for 2 days. The voltage dropped to just under 12 volts and it still had no trouble starting the engine. However, in that circumstance the battery absorbed 60+ amps for at least 15 minutes. No harm done but if it happens again I will put it on the charger for a more leisurely charge rate. john On 3/13/2019 5:02 PM, markfw wrote: > > I am building an electrically dependent LSA Carbon Cub. I will be using the SDS EFI system. I am currently planning to use Z-07 as the basis for my electrical system architecture. > > I have three questions: > > > 2. I have been looking at using a pair of EarthX ETX680 (PC680-equivalent) LiFePO4 batteries since they have a BMS that will post info to my GRT EFIS about their condition. I would like to use both batteries for starting as in Z-07. I have read that people like to separate their avionics bus from the starting battery because of a potential voltage drop during starting. However, the BMS on the EarthX batteries takes their output to zero if it drops below either 12.8v or 11.5v (both are stated in their on-line documentation). Since the EarthX batteries can demonstrably start Lycoming 4 cylinder engines without dropping off line, does this in fact imply that there is not a voltage drop below 11.5v on starting with them? Is this a difference between LiFePO4 batteries and lead acid batteries? > > > Mark[/quote] > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=488059#488059 > > ________________________________ Message 4 _____________________________________ Time: 05:46:23 PM PST US Subject: AeroElectric-List: Re: Three Questions on Z-07 From: "markfw" thank you John. Very useful information. I will talk to EarthX about dual batteries. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488061#488061 ________________________________ Message 5 _____________________________________ Time: 07:48:20 PM PST US Subject: AeroElectric-List: Re: Three Questions on Z-07 From: "user9253" Electronic parts frequently become obsolete and are replaced by improved versions. Search Mouser for part number DSS2x61-01A. At the expected engine load, the diode will drop about 0.7 volts or less and could get hot consuming 10 watts of power. Mount it to a heatsink using heat conductive paste. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=488065#488065 ------------------------------------------------------------------------------------- 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.