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Post Posted: Wed Feb 15, 2017 6:53 pm 
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My Osprey 225 has two group 27 size Duralast Marine batteries... I don't know how old they are but they seem to hold a charge and do come up to full charge once on a charger... I'm only showing 12 +/- 1 volt when on the run whether running on #1, #2, or BOTH... I don't know what normal is... Several questions here...
1) If I crank on #1 do I then run on #1 to charge it back up?
2) If I anchor and run accessories on #2 do I keep it on #2 back to the dock?
3) If I run on both does the rectifier/regulator have enough juice to charge both batteries?
4) Any suggestions on types/brands of batteries? I've had good luck with Sears Marine but those were not maintenance free. Due to the location of these batteries I don't plan on servicing (adding water or removing to charge) them. I've also used Optima Batteries with limited success on a 24 volt trolling motor setup. They're very expensive!
5) Would you recommend the # 2 battery to be a "dual purpose" versus "cranking" battery since that would be used primarily to run accessories while anchored?

Any and all suggestions welcome!
Thanks!

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Post Posted: Wed Feb 15, 2017 7:04 pm 
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You might be seeing voltage drop in the wiring between your batteries and the helm.

While running you should see 14v at the batteries. But with corrosion that builds up in the wire and connectors over time resistance builds up dropping the voltage in the system by the time it reaches the helm.

You want a dual purpose battery for the #2 battery.

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Post Posted: Wed Feb 15, 2017 8:00 pm 
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Get an automatic charging relay (ACR) always keep on bat 1, when it is charged,relay will automatically switch and charge bat 2

google blue seas ACR


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Post Posted: Wed Feb 15, 2017 8:08 pm 
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i would check your voltage with an actual meter at the batteries. like said voltage drop due to corrosion or just a gauge on its way out can and will lie to you. and battery 2 should be dual purpose battery. ACR is almost a must for 2 batteries on a boat like yours.

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Post Posted: Wed Feb 15, 2017 8:58 pm 
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Ok... On checking the voltage would it charge at idle power? It would be kind of difficult to get under there with a meter while my wife steers the boat at speed, not to mention dangerous! sSc_eek

The Automatic Charging Relay seems like a good idea but it may be beyond my wiring skills... I'll look into it! sCo_hmmthink

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Post Posted: Wed Feb 15, 2017 9:10 pm 
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I run on both batteries and my engine charges these batteries. On board charger charges 3 out of the 4 batteries on board. I seem to get better service out of my batteries by doing it that way. Like the sound of ARC though. Duracell Ultra 34 Marine battery 48 months warranty. Dual purpose.

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Post Posted: Wed Feb 15, 2017 9:58 pm 
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Keep the battery suggestions coming! I can get 5 experienced boaters and each and every one will have a different opinion on battery type as well as brand as well as usage. I'm leaning toward maintenance free AGM cranking battery for the #1 spot and a dual purpose for #2... Also maint. free... As far as switching is concerned for the purpose of charging... That remains to be figured out.

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Post Posted: Wed Feb 15, 2017 11:02 pm 
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I have the Blue Seas ACR kit Pete posted. Best thing I ever added to the boat. No more battery management to worry about. Actually with that set up there is no selection for batt 1/ batt 2. Just off/on/combine. Batt#1 is dedicated the engine starting only. Batt#2 is dedicated to house loads only. The combine position of the switch allows you to to connect both batteries together in the event one of them dies. So I can sit all day long running the stereo, livewell lights etc without having to worry about killing my start battery. The ACR will automatically connect the batteries together whenever it senses a charge voltage on EITHER battery.

Oh BTW both my batteries are dual purpose Deka group 27s.

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Post Posted: Thu Feb 16, 2017 7:42 am 
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Sounds like the team here has you going down the ACR road which is sound advice. I'll chime in on my view. I opted for Walmart Marine 27s deepcycle dual purpose for both. I did this so I can alternate b/t which battery is my house and which is dedicated for starting. I spend a lot of time ofshore at anchor running livewell, radio, electronics plus do the sandbar radio thing... essentially, I am out every weekend. These batteries will have lasted 4 years this summer and still perform well. I do have an onboard charger I plug in at the house time to time but it's infrequent. Your engine will not produce enough volts to make a meaningful charge at idle. Prob has to hit 2k or so rpms b/f you will see 14v out of the engine. If you have depleted your batts and you are running the boat the gauge at the helm will show less than 14v which is normal. At least that is the way mine worked. Go to Walmart and save some bucks!

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Post Posted: Thu Feb 16, 2017 10:27 am 
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I was going to mention that your not going to get much charge voltage or amps at idle or low RPMS. Keep in mind your outboard has a magneto based charging system NOT an alternator like a car.

I've had good luck with Wally world batteries. If you have a Sam's club membership their "Duracell" batteries are now made by East Penn Mfg which is Deka. I think I paid about $99 each for mine there a few months back.

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Post Posted: Thu Feb 16, 2017 6:51 pm 
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I like the ACR idea and am wondering how complicated it is to install. I like simple! I also like Walmart batteries and have used them in both marine and automotive applications but they don't make a maintenance free marine battery that I know of. Don't know about the Duracell but I'll bet they're good as stated but maintenance free too? AGM Maintenance free is what I prefer since those damn things are buried deep in the transom...

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Post Posted: Thu Feb 16, 2017 7:42 pm 
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Deka (East Penn Mfg) also makes a AGM battery and you can get them at Sam's club sold under the Duracell badge. In my opinion you don't really need them.

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Post Posted: Thu Feb 16, 2017 9:17 pm 
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Installing an ARC isn't hard, we can walk you through it, as far as batteries I'm going on four years with my AGM Duracells from Sams, but I do keep them on a automatic charger/conditioner when not in use.

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Post Posted: Thu Feb 16, 2017 10:51 pm 
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Ok guys... Really appreciate all the feedback! For now I'm going to make sure the engine is charging the batteries by putting a multi meter on them while running. Will have to get longer leads though... Then when I get new batteries maybe before summer I'll see about the ARC Hookup.

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