Batteries replacement

[thbouro]

I want to replace the batteries in my 2001 Searay 310 Sundancer. The existing battery setup consists of the port battery connected to the port engine and the two starboard engines connected each other and providing power to the starboard engine and the boat's accessories. All three are charged by a single battery charger.

I would like some advise concerning the type of batteries to chose; flooded vs AGM vs gel vs Li; three starting batteries vs two starting and one deep cycle vs three dual purpose.

In case of mixing different type of batteries (for example one starboard starting battery and one starboard deep cycle, which are interconnected), will there be any problem during charging? (reminder: only one charger on board)

Thanks


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[Boston-boater]

I have a 2000 310 on which I replaced all the batteries last year. I had three old flooded batteries that I replaced with four AGMs. Three 90 amp on the starboard side for engine start and house and one 70 amp on the port for starting. All of them are from West marine. I compared all available brands and found the WM were the best cost per amp. I moor the boat often and the three House batteries provide days of power. I have no generator.

 

[dwna1a]

I have the same setup, two are cold start batteries and one is a deep cycle (house). I replaced all mine with Optima Bluetops. They weigh a little less, less worry about watering the cells. Big thing here to be sure of is to be sure your charger will work what ever batteries you plan to use.

 

[thbouro]

I have the same setup, two are cold start batteries and one is a deep cycle (house). I replaced all mine with Optima Bluetops. They weigh a little less, less worry about watering the cells. Big thing here to be sure of is to be sure your charger will work what ever batteries you plan to use.

No charging problem since both types of batteries (starting and deep cycle) are charged by the same charger? Are they AGM?


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[dwna1a]

I've had no issues with my charging system and the AGM batteries, but other members here have. You just need to double check your system before you spend the bucks for blue tops

 

[thbouro]

I've had no issues with my charging system and the AGM batteries, but other members here have. You just need to double check your system before you spend the bucks for blue tops

Do you know what type of charger you have? My charger is "Professional Marriner Flyback 20-3" (it came with the boat) and, according to the manual, there are two switches to choose between LEAD/ACID and GEL CEL; AGM selection is not mentioned.


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[Wylie_Tunes]

No charging problem since both types of batteries (starting and deep cycle) are charged by the same charger? Are they AGM?


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If they are both lead acid wet cell, they are considered the same type. An AGM would be a different type.

For anyone considering an AGM. Rather than an Optima Blue top, look into the Ah of the batteries from Kinetic, XS Power or Shuriken. Far better $$$ to Ah ratio IMO, especially if they will be used in a house bank for engine off times.

 

[thbouro]

I just received some feedback by the producer of the existing charger (Professional Marriner Flyback 20-3) and confirmed that it can work without any problem with the standard AGM batteries. He said that if I install high performance AGM, I will have to change the charger. Any idea what is the "high performance AGM" and what is the difference with the "standard" one?


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