Nothing wrong with that. It works for those who pay good attention to switching and consumption. For those who don't, it's an invitation for trouble.
Rich > On May 5, 2014, at 15:07, dwight via CnC-List <cnc-list@cnc-list.com> wrote: > > Save yourself some trouble…use all deep cycle batteries, 2 golf cart 6V units > connected in series if possible or 2 deep cycle group 27’s, use the selector > switch to charge one bank at a time from the alternator…works for me and > seems quite simple…those 12V deep cycle batteries have way more than enough > cranking amps to start our sailboat engines in summer, so you can alternate > between bank 1 and bank 2 for starting or house, I do that regularly to make > sure both banks get taken down and require charging on a semi regular basis. > > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Marek > Dziedzic via CnC-List > Sent: May 5, 2014 2:02 PM > To: Edd Schillay; cnc-list@cnc-list.com > Subject: Re: Stus-List Mixed batteries > > Edd, > > I don’t want to start a discussion on how to charge the batteries (as this > would be off topic), but starting from the ALL position has some major > disadvantages. One is that you might be hiding a problem with your starting > battery; two is that if one battery is weak, you would be charging that weak > battery from the strong one (you risk that if one is nearly dead, the other > would not start the engine, either, but instead would discharge to equalise > the voltage with the weak one). > > No question (in my mind), the best way is to start from the starting battery > (hence the name) and have the echo charger making sure that both batteries > are charged properly. > > Some advocate to have the batteries split into “main” and “spare”. Many good > marine batteries can be used as dual purpose. If you design your system this > way, you start on the “main”, it gets charged by the alternator and the echo > charger maintains the “spare”. > > If I remember correctly, you have a solar system, as well. Many charge > controllers have a dual battery option and they can be setup to charge the > “main” battery first and then charge the “spare” (mine has a selectable 50/50 > or 90/10 split). > > If you are interested, you can check some of Main Sail’s articles on that > topic at Sailboat Owners or at his web site > (http://www.pbase.com/mainecruising/). > > Marek (in Ottawa) > > PS. Would “may the Force (May the 4th) be with you” apply, even if it is a > day late? I know it is mixing the references... > > From: Edd Schillay via CnC-List > Sent: Monday, May 05, 2014 10:58 AM > To: cnc-list@cnc-list.com > Subject: Re: Stus-List Mixed batteries > > Rich, > > Please do send around a diagram. I’m planning to do something similar — a 27 > starting battery (as battery #2) and a 31 house bank (as battery#1). > > When I want to start and run the engine, I will do so on ALL. That way the > alternator will charge both batteries. When sailing and “hanging out”, I > would switch to 1 only. > > I have a solar panel and a dual battery regulator, which would connect to > both. > > Two weeks to launch and still much to do….. > > > > All the best, > > Edd > > > Edd M. Schillay > Starship Enterprise > C&C 37+ | Sail No: NCC-1701-B > City Island, NY > Starship Enterprise's Captain's Log > > On May 5, 2014, at 10:38 AM, Rich Knowles via CnC-List > <cnc-list@cnc-list.com> wrote: > > > The best method I have found and the least problematic from all points of > view is to have a dedicated starting battery that does nothing else but start > the engine, and a house battery that can be several batteries in parallel. > Ideally the house batteries will all be identical. I feed the alternator > directly to the house battery and use a device such as a Xantrex EchoCharge, > a small regulator, to keep the start battery charged. A simple 1/both/2 off > switch feeds the house load from either battery and acts as a combiner switch > if needed. I have a diagram I can send you if you wish. > > I have wired many boats this way with no complaints or incidents. > > Rich Knowles > Indigo. LF38 > Halifax. NS > >> On May 5, 2014, at 10:47, via CnC-List <cnc-list@cnc-list.com> wrote: >> In a pinch, I recently bought a 'starting' battery (Group 27) per my earlier >> post (no marine stores open after 6 on Saturdays) >> >> Then I decided to get a replacement for my dead Lifeline AGM battery. >> >> Of course, Murphy lurking about, I realized that my Zantrex Truecharge 40 >> wants all the batteries it charges to be the same since >> its charging schemes apply to all three outputs to the batteries. >> >> Before I pull the 'rope-a-dope' of returning the starting battery, I need >> some list advice: >> >> A lot of sailors suggest using a 'starting' battery exclusively for starting >> and using the house batteries for the house. I am aware that >> an AGM can be used for starting as well. >> >> However, if a 'starting' battery is better for this job (CCA, etc.) and the >> AGM is better for its job, how does one use a single charger like mine >> to satisfy different charging schemes? >> >> 2 chargers, a smarter charger that has outputs for different battery >> characteristics, or 'forgetaboutit" and charge both batteries as though >> the were both AGMs? >> >> Charlie Nelson >> Water Phantom >> C&C 36 XL/kcb >> >> cenel...@aol.com >> _______________________________________________ >> This List is provided by the C&C Photo Album >> http://www.cncphotoalbum.com >> CnC-List@cnc-list.com > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com
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