+1 to Rick's comments. IMO you should get 2 of the largest and highest Amp-hour (heaviest) "deep-cycle" batteries that will fit in your compartment. Use them interchangeably to start and run house loads. Others have suggested switching the 1-ALL-2 selector based on the odd/even day of the week to equalize run time.
There are things you can do to improve your setup but if the exsisting setup has worked without issue for 12 years then I say stick with it. Remember not to switch the 1-ALL-2 when running the engine. Doing so can momentarily break the charging circuit and blow the diodes/regulator in the alternator. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Sep 28, 2014 10:47 AM, "Indigo via CnC-List" <cnc-list@cnc-list.com> wrote: > Looks like I need new batteries! I have lived for 12 years with two > batteries - one used for house and the other kept in reserve via off-1-all > -2 switch. > > Would like to have a dedicated starting battery in addition to two > deep-cells but do not see how I can fit the three in the locker under the > quarter berth - and am reluctant to give up any other locker space. - so it > looks like I will stick to the two. > > I googling marine batteries I see that there are dual purpose ones > available. Anyone know if this is just a marketing "hoax". In particular > Batteries Plus have a Group 27 dual purpose Duracell battery for $95 - > seems like a steal - or am I going to be disappointed with how long I can > expect it to last (I presume all group. 27 give out the same amp/hours - or > do I have to watch out there? > > -- > Jonathan > Indigo C&C 35III > SOUTHPORT CT > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of > page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > >
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