---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Thu 03/22/18: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 03:41 PM - Re: Regulator set point (Robert L. Nuckolls, III) 2. 04:08 PM - Re: Regulator set point (Jan de Jong) ________________________________ Message 1 _____________________________________ Time: 03:41:05 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Regulator set point At 11:23 AM 3/21/2018, you wrote: > >I would like to mention: check any danger of high currents if a >LiFePO4 battery (13.2V) is directly parallelled with a lead-acid >battery (12.6V). I just measured an SVLA resting voltage of 13.1 volts while my EarthX is 13.4 volts. When connected together, there WAS a circulating current on the order of 400mA. In an operational scenario where both batteries are floated on a 13.8 to 14.2 volts bus, I suspect the circulating currents between the two will be small in the event of alternator failure. If one sets 2.8v per cell as minimum discharge voltage, this translates to 11.2 volts which corresponds to a 90% plus depletion of the SVLVA as well. Bob . . . ________________________________ Message 2 _____________________________________ Time: 04:08:48 PM PST US Subject: Re: AeroElectric-List: Regulator set point From: Jan de Jong There might only be a concern then if an architecture allowed parallelling after serious discharge of the lead-acid battery? Jan de Jong On 3/22/2018 11:40 PM, Robert L. Nuckolls, III wrote: > At 11:23 AM 3/21/2018, you wrote: >> >> >> I would like to mention: check any danger of high currents if a >> LiFePO4 battery (13.2V) is directly parallelled with a lead-acid >> battery (12.6V). > > I just measured an SVLA resting voltage of 13.1 volts > while my EarthX is 13.4 volts. When connected together, > there WAS a circulating current on the order of 400mA. > > In an operational scenario where both batteries are > floated on a 13.8 to 14.2 volts bus, I suspect > the circulating currents between the two will be > small in the event of alternator failure. If one > sets 2.8v per cell as minimum discharge voltage, this > translates to 11.2 volts which corresponds to a 90% > plus depletion of the SVLVA as well. > > 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.