Great info Lee.. So I take it the sub battery was 220-240 VDC, so jumping one sell would be only a 1% drop. This is the first I have heard of not charging the battery if it was discharged to less than 75% of the AH capacity. Everything I have read says that the "fuller" you keep the battery (without overcharging) the better. Home Power has often said the Number One cause of early failure of house batteries is chronic undercharging, and the Number Two cause was overcharging. But they do recommend more frequent equalization, like every two to six weeks, the deeper the discharges the more often the equalization. Thanks again for the great info on battery care. I will study your input when I get back to the boat and follow it. My AH meter is supposed to automatically compute charge efficiency and compensate but I have found that even when it says the battery is charged the hydrometer tells a different story. I will look into the problem I will also seriously consider separate cells the next time I change out my house batteries. Do you recall how many jumpered cells you had in the course of the battery's life? Norm S/V Bandersnatch Lying Julington Creek 30 07.695N 081 38.484W > [Original Message] > From: LA Licata <[EMAIL PROTECTED]> > To: <liveaboard@liveaboardnow.org> > Cc: Norm of Bandersnatch <[EMAIL PROTECTED]> > Date: 11/25/2008 10:25:20 AM > Subject: Re: [Liveaboard] Submarine Battery Discharges > > Norm, > > The number of cells we had is hazy, but I think somewhere around > 220-240 seems to stick in my mind.
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