The 13V comment is for "Gel Batteries" not AGM's. You will find that most any marine battery charger will have at least two charge selections Gel and Flooded. AGM's normally use the flooded position. I see that in 2009, many (maybe all) chargers in WM have an AGM position.
Take a look at 2009 WM page 259, you will note that AGM's have the highest charge voltage, 14.7, followed by flooded at 14.6, the Gel at 14.1. Looking at 2009 WM page 252, AGM has best charge acceptance and 3% self-discharge rate. Deep cycle flooded have a 6% self-discharge rate. If your only charging with the engine, the AGM's will do the best, they will accept more of the charge and self-discharge at a slower rate. As far as starting the engine. I found that my 85 C27 had bad factory crimps on ALLl of the #4 battery wires. The bad crimps caused too much voltage loss to start with one battery. Replacing the #4 terminals with properly crimped terminals fixed the problem. Also, AGM's are a little better starting battery then flooded deep cycle batteries. John sleepbod wrote: > --- In [email protected], "Bob" <kniggit...@...> wrote: >> I am figuring I am using on the house battery about 57 amps per day + 20% >> would be 70 amps > I go a week between charges and I only use the engine alternator to charge > the batterys. Both batterys discharge somewhat when sitting for a week. It is > my understanding that AGMs sitting discharge rate is much better than the wet > cells I am using.I have never been able to start the engine on the House > battery alone. I did find today that I should use a adjustable voltage > regulator to make sure that the AGMs are not being charged at a rate above 13 > volts. That might be the straw that pushes me back towards the wet cells. > >> Hi Joe, >> >> Since your post has gone unanswered for 2 days, I'll offer my $.02 opinion. >> "Size is much more important that type" >> >> So the real questions are: >> how much power do you need? >> how long do you want to go between recharges? >> how are you going to recharge? >> >> As far as AGM vs conventional batteries, I think the key question is: Will >> the advantages offered by AGM's justify the higher cost? >> >> Bob Stockley >> Sundance #2436 >> >> --- In [email protected], "sleepbod" <jpkeo24@> wrote: >>> I need to replace my batteries. Has anyone had any expierience moving from >>> wet cells to AGM's. I currently have a 27 series for starting and a 24 >>> series for house. I am considering going to 2 27 series AGMs. I need more >>> storage for the house battery. I have a Universal 18 Diesel with a 51 amp >>> alternator. Should I plan on increasing that as well? >>> >>> Thanks, >>> >>> Joe Keogh >>> Branwyn >>> 5465 >>> > > > > > ------------------------------------ > > Yahoo! Groups Links > > > >
