---------------------------------------------------------- RV10-List Digest Archive --- Total Messages Posted Thu 05/27/21: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:58 AM - Auxiliary Battery (Greg McFarlane) 2. 05:47 AM - Re: Auxiliary Battery (Lenard Iszak) 3. 06:40 AM - Re: Auxiliary Battery (Charlie England) 4. 07:36 AM - Re: Auxiliary Battery (Richard McBride) 5. 09:51 PM - Re: Auxiliary Battery (Robert Jones) ________________________________ Message 1 _____________________________________ Time: 04:58:30 AM PST US Subject: RV10-List: Auxiliary Battery From: "Greg McFarlane" Planning a Dual Electronic Ignition for the RV10 and looking at the options for charging an Auxiliary Battery. This is a single Alternator, single main/cranking Battery system. Looks like the simplest charging system for the Auxiliary (apart from the integrated battery units like TCW etc) is using a VSR (voltage sensitive relay) The one Im looking at is a very compact unit that cuts in at 13.2volts and cuts out at 12.8volts. Is anyone using a VSR like that ? and has it been satisfactory ? .... Or any other ideas appreciated. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=502064#502064 ________________________________ Message 2 _____________________________________ Time: 05:47:37 AM PST US From: Lenard Iszak Subject: Re: RV10-List: Auxiliary Battery I used a VSR early on. Two versions, a BlueSea and then an australian one. They both had a pretty bad parasitic draw. Removed it and installed a Xantrex charger instead and that worked well. I used Panasonic SLA batteries and when I tested them every year they needed to be swapped out. The last set I was trying to buy at BatteriesPlus were almost completely discharged. They were basically abused before sold. A lot of batteries are. For the last couple of years Ive been using two TCW batteries, a 6A one for the Efis screens and an a 3A one for the Lightspeed ignition. Im finally happy with that setup and feel its safe to rely on if needed. Its a very well thought out design and now they sell replacement battery packs too. Lenny > On May 27, 2021, at 8:07 AM, Greg McFarlane wrote: > > > Planning a Dual Electronic Ignition for the RV10 and looking at the options for charging an Auxiliary Battery. This is a single Alternator, single main/cranking Battery system. Looks like the simplest charging system for the Auxiliary (apart from the integrated battery units like TCW etc) is using a VSR (voltage sensitive relay) The one Im looking at is a very compact unit that cuts in at 13.2volts and cuts out at 12.8volts. Is anyone using a VSR like that ? and has it been satisfactory ? .... Or any other ideas appreciated. > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=502064#502064 > > > > > > > > > ________________________________ Message 3 _____________________________________ Time: 06:40:29 AM PST US From: Charlie England Subject: Re: RV10-List: Auxiliary Battery On Thu, May 27, 2021 at 7:03 AM Greg McFarlane wrote: m > > > > Planning a Dual Electronic Ignition for the RV10 and looking at the > options for charging an Auxiliary Battery. This is a single Alternator, > single main/cranking Battery system. Looks like the simplest charging > system for the Auxiliary (apart from the integrated battery units like TC W > etc) is using a VSR (voltage sensitive relay) The one I=99m lookin g at is a > very compact unit that cuts in at 13.2volts and cuts out at 12.8volts. Is > anyone using a VSR like that ? and has it been satisfactory ? .... Or any > other ideas appreciated. > > It's kinda hard to make a solid recommendation without knowing how you're using the aux battery. The simplest thing to do to isolate a battery that is 'offline' in normal use is to use a Schottky power diode between the regular bus and the battery positive. The Schottky has lower forward voltage drop than a regular diode, and as the battery nears full charge, the voltage drop across the diode diminishes to as low as 150 mV. If the aux battery has no loads attached in normal operation, it will eventually fully charge and stay charged, as long as your bus is at the proper level for charging normal SLA batteries (~14-3-14.7V). The diode itself will prevent the battery from powering the bus, but you must manage how the load(s) connect to the aux battery. If you simply add a tie to the desired equipment, without isolating the equipment from the bus, then activating the tie will allow the aux battery to power the bus. Some equipment (ex: GRT & some other EFIS brands) provide multiple diode-isolated power inputs. In cases like that, the aux bat would come online automatically if bus power is lost, but the device would remain powered up after you intentionally power down the bus so you'd have to remember to turn off the device manually after your normal shutdown process at the end of the flight. Have you looked at all the info in the Aeroelectric Connection book and 'Z figures'? Charlie ________________________________ Message 4 _____________________________________ Time: 07:36:12 AM PST US From: Richard McBride Subject: Re: RV10-List: Auxiliary Battery Lightspeed provides the below wiring scheme for a dual battery solution. Th e second battery is isolated to run one ignition. That battery is isolated v ia the Schottky diode Charlie discusses below. I did this on my -8 and it h as worked flawlessly for 1000 hours. I got a very nice diode from Perihelio n Design (https://periheliondesign.com/ ), that we put in our -10 project. U nfortunately, it appears they no longer carry the diode. But it might be wo rth checking with them to see if they can provide one. http://lightspeed-aero.com/Manuals/PS_Diagram.htm Rick > On May 27, 2021, at 7:46 AM, Charlie England wrote: > > =EF=BB > > >> On Thu, May 27, 2021 at 7:03 AM Greg McFarlane w rote: m> >> >> Planning a Dual Electronic Ignition for the RV10 and looking at the optio ns for charging an Auxiliary Battery. This is a single Alternator, single ma in/cranking Battery system. Looks like the simplest charging system for the A uxiliary (apart from the integrated battery units like TCW etc) is using a V SR (voltage sensitive relay) The one I=99m looking at is a very compa ct unit that cuts in at 13.2volts and cuts out at 12.8volts. Is anyone using a VSR like that ? and has it been satisfactory ? .... Or any other ideas ap preciated. >> > It's kinda hard to make a solid recommendation without knowing how you're u sing the aux battery. The simplest thing to do to isolate a battery that is ' offline' in normal use is to use a Schottky power diode between the regular b us and the battery positive. The Schottky has lower forward voltage drop tha n a regular diode, and as the battery nears full charge, the voltage drop ac ross the diode diminishes to as low as 150 mV. If the aux battery has no loa ds attached in normal operation, it will eventually fully charge and stay ch arged, as long as your bus is at the proper level for charging normal SLA ba tteries (~14-3-14.7V). > > The diode itself will prevent the battery from powering the bus, but you m ust manage how the load(s) connect to the aux battery. If you simply add a t ie to the desired equipment, without isolating the equipment from the bus, t hen activating the tie will allow the aux battery to power the bus. Some equ ipment (ex: GRT & some other EFIS brands) provide multiple diode-isolated po wer inputs. In cases like that, the aux bat would come online automatically i f bus power is lost, but the device would remain powered up after you intent ionally power down the bus so you'd have to remember to turn off the device m anually after your normal shutdown process at the end of the flight. > > Have you looked at all the info in the Aeroelectric Connection book and 'Z figures'? > > Charlie > > > ________________________________ Message 5 _____________________________________ Time: 09:51:53 PM PST US From: Robert Jones Subject: Re: RV10-List: Auxiliary Battery I might consider a standby alternator from B and C that mounts on the vacuum pump pad. I personally dont like electronic ignition systems that are dependent on ships power. I installed the P-Mags on my 10 because they generate their own power. Robert Jones > On May 27, 2021, at 5:02 AM, Greg McFarlane wrote: > > > Planning a Dual Electronic Ignition for the RV10 and looking at the options for charging an Auxiliary Battery. This is a single Alternator, single main/cranking Battery system. Looks like the simplest charging system for the Auxiliary (apart from the integrated battery units like TCW etc) is using a VSR (voltage sensitive relay) The one Im looking at is a very compact unit that cuts in at 13.2volts and cuts out at 12.8volts. Is anyone using a VSR like that ? and has it been satisfactory ? .... Or any other ideas appreciated. > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=502064#502064 > > > > > > > > > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv10-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV10-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/rv10-list Browse Digests http://www.matronics.com/digest/rv10-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.