I agree with Jim's recommendations. If you do take them somewhere for testing and they tell you anything less than an hour to test, go somewhere else.
Dennis C. Touche' 35-1 #83 Mandeville, LA On Sun, Jul 16, 2017 at 6:22 PM, Jim Watts via CnC-List < cnc-list@cnc-list.com> wrote: > Tom, battery voltage should be tested after resting for an hour or more > after charging. Your charging voltage sounds about in the right range, but > you are measuring the voltage coming out of the charging source, not the > battery. 13.2 V is about minimum voltage to overcome internal resistance > and actually charge the battery. A healthy charged battery will test at > around 12.65+ after resting for 12 hours. Each battery will have to be > checked individually, so they should not be interconnected for that. Just > remove the black wire for testing, you don't have to totally strip them. > In addition, get a *good* battery hydrometer and check each cell for the > right specific gravity. My battery guys recommend the EZ Red unit, and I > agree. (http://www.ezred.com/product/battery-hydrometer/) I had THREE > cheap hydrometers give me similar readings that were nowhere near reality, > and that cost me a couple of weeks of anxiety while cruising, and a lot of > work taking the three Group 31's out and having them tested for real with a > pro analyzer, then reinstalling them. West Marine stores generally have a > load-testing type of analyzer if you drag the batteries in to the store, > but I'd advise taking them to a real battery shop if you're going to that > amount of labour. Good luck. > > > > Jim Watts > Paradigm Shift > C&C 35 Mk III > Victoria, BC > > On 16 July 2017 at 15:37, Tom Buscaglia via CnC-List < > cnc-list@cnc-list.com> wrote: > >> I stressed out m house bank pretty bad by leaving the frig on and the >> D.C. On, but the shore power, and this the charger, came lose on the boat >> due t my sloppy connecting. >> >> It was discovered after 3 days or so. I am concerned that the batteries >> may be damaged beyond use...just like the set of house batteries these >> replaced, after two full days at anchor with the frig runningh. >> >> Very lagged with them all still wired into the boat are around 12.5. 13.2 >> when the engine is running and 13.7 with the charger on. >> >> Some questions for the list's cumulative wisdom... >> >> Do I need to disconnect the battery to accurately assess its health? >> >> Are these voltages in an appropriate rage? >> >> thx >> >> Tom Buscaglia >> S/V Alera >> 1990 C&C 37+/40 >> Vashon WA >> P 206.463.9200 <(206)%20463-9200> >> C 305.409.3660 <(305)%20409-3660> >> >> >> _______________________________________________ >> >> This list is supported by the generous donations of our members. If you >> wish to make a contribution to offset our costs, please go to: >> https://www.paypal.me/stumurray >> >> All Contributions are greatly appreciated! >> >> > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > >
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