Edd,
Your results may vary, but normally, the 20 min engine run is not enough to charge the batteries to 100%. This is a normal issue with boats that don't use the shore power. You get your batteries charged to about 80% (above that level the rate of charging drops significantly and you would have to run the engine for a long time to complete the charging cycle). This is why a solar system helps, because it competes the charging cycle when you are away. This is particularly important with AGM batteries, because they really like to be fully charged after each discharge cycle. Marek (in Ottawa). From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Edd Schillay via CnC-List Sent: Wednesday, April 30, 2014 5:06 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Battery options Josh, Not really. Even when cruising, I will run the engine for 20 minutes to pick up a mooring or depart one and give the system a good charge. I've also replaced all my lights with LEDs and usually try to draw as little as possible. I have two Group 31s now from Sears (http://www.sears.com/diehard-platinum-marine-battery-group-size-31m-price/p -02850131000P?prdNo=1 <http://www.sears.com/diehard-platinum-marine-battery-group-size-31m-price/p -02850131000P?prdNo=1&blockNo=1&blockType=G1> &blockNo=1&blockType=G1). Three year warranty, and, of course, this is now year four, and one is deader than an original series red-shirt crewman. 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 <http://enterpriseb.blogspot.com/> On Apr 30, 2014, at 4:46 PM, Josh Muckley via CnC-List <cnc-list@cnc-list.com> wrote: You have no fear of missing the additional amp-hrs? I love being able to go many days without hooking up. Remember draining less than 50% (~12.2v no load) starts to decrease over all battery life. I was in a pinch and bought what was available at the closest availble store. Autozone marine...seem to be doing fine 2 years later. Josh On Apr 30, 2014 11:38 AM, "Edd Schillay" <e...@schillay.com> wrote: Listers, I have two very-large AGM house banks and one of them is at 12.7 volts and the other is at 11.9. I tried charging the latter, and it slowly drained back down to 11.9 after a couple of weeks. Assuming I can't get it to hold a charge again, I'm thinking of replacing it with a small engine-starter type of battery and use ALL to start/run the engine and then flip to 1 when in other modes. Any recommendations for a good all-purpose (and inexpensive) sealed battery good for giving the engine a good starting jolt? 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 <http://enterpriseb.blogspot.com/> _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com <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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