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Old 11-24-2013, 08:33 PM   #1
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Batteries

With the purchase of N4712, we've been going through systems and getting parts, etc. It's time to replace the batteries there are 7 8D lifeline AGM's and one 4D lifeline. Should we replace them with lifelines, or is there an another brand we should consider?
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Old 11-24-2013, 08:37 PM   #2
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How deep is your wallet ?

I'm a big fan of replacing 8D units with 6v batteries- they weigh less (easier for 1 man to handle) and can provide all the power requirements you need.
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Old 11-24-2013, 08:47 PM   #3
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How deep is your wallet ? I'm a big fan of replacing 8D units with 6v batteries- they weigh less (easier for 1 man to handle) and can provide all the power requirements you need.
We would really like to keep everything the same way it's setup. Were going pay for someone to do it no matter what (to much weight lifting )just wanted to know if there were other brand AGM's that were good also.
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Old 11-24-2013, 11:08 PM   #4
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I vote for Peter's suggestion. Lifelines will be 3-5 times as expensive per amphour of capacity as top of the line Trojan 6V golf cart batteries.

Two 6V batteries will fit in the same space as an 8D. All it takes is another jumper to parallel two batteries to make 12V.

The only downside to flooded cell batteries is checking the water in the cells. I check mine every 3 months and usually have to add water twice each year. Pretty small effort to save thousands of dollars.


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Old 11-24-2013, 11:22 PM   #5
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Maybe I worded my question wrong, I just want to know if there any other manufactures of agm 4D's and 8D's that people have used and want their opinions. money is not the problem, nor is weight.
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Old 11-25-2013, 12:16 AM   #6
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I have used Lifeline Batteries and I think they are terrific. I decided that I couldn't afford them the last time I changed batteries so I went with batteries made by Full River in China. I've had them in service for a little over a year now and so far so good. My boat has 2 - 4D and 1 Group 31 Battery. Full River batteries are sold under a couple of different names here in the States.
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Old 11-25-2013, 12:54 AM   #7
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I'm with Hopcar on this. I have gone with Fullriver AGM s for house and start.
Have not had them in for long but so far I am extremely happy with my new set up 8 x 250 amp/hr batteries @ $320.00 each and 2 x 12 V start batteries @ $400.00 each. These are Aussie prices and probably cheaper in the US.
My marine leckky here in Aus swears by them and says he has never had any problems.
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Old 11-25-2013, 01:05 AM   #8
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I'd stick with the Lifelines as the boxes, chargers, wiring etc is all set up for them. BTW, if not already done, this would be a good time to install a pure sine wave inverter. Many of the Nordhavns of your vintage had the MSW units.
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Old 11-25-2013, 06:22 AM   #9
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other brand AGM's that were good also.

AS GOOD? You have to define good.

The big advantage of AGM is their ability to recharge at a great rate , to cut the recharge time
.
Sadly almost no boats with AGM have the capacity to actually USE this feature .

200-400Amps of charging power is usually needed , So for most there a waste of time .

If money is no object spring about $200 for a SOC meter and have it installed.

This is your gas gauge and will keep whatever you purchase from harm, and get the best use of the batts and charging system you have.
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Old 11-25-2013, 07:32 AM   #10
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Odyssey makes good AGMs. After much research., we chose Odyssey for our DSe 12m "Sunshine." After 5 years of hard use, we recently replaced them with lithium.

BTW, when hooking up two 6v batteries to make a 12v one, it is called "series."

When hooking up two batteries of the same size to increase the AHs, it is calmed "parallel."
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Old 11-25-2013, 07:58 AM   #11
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Alright, I think well just stay with lifelines, and yes we do have a trace pure sine wave inverter/charger.
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Old 11-25-2013, 08:05 AM   #12
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Thanks, I'll look into a SOC meter. Any preferred brands?
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Old 11-25-2013, 08:56 AM   #13
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SOC Battery Monitor
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Old 11-25-2013, 09:08 AM   #14
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Thanks!
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Old 11-25-2013, 09:49 AM   #15
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Just breezing thru a few of the battery subject threads, and it really does appear that MANY prefer those 6-volt Golf cart batteries. I found numerous interesting discussions, and this one brief one:

Quote:
Originally Posted by Marin
We replaced our two 8Ds with six, 6vdc golf cart batteries (three 6vdc batteries fit in one 8D box). The big advantage for us is that four 6vdc batteries have approx twice the amp hours of one 8D. The other two 6vdc batteries fill the role of start battery and have the same amp hour rating as one 8D.

So with no change to the boat's wiring or physical battery setup we doubled our house power capacity and retained our start battery capacity but with smaller and lighter individual batteries.
Trawler Forum - View Single Post - Time for new batts, should i go 12v or 6v?

Time for new batts, should i go 12v or 6v?
(Did not read all way thru this subject thread, but it appears as though there was lots of good info. BUT it was 'closed off'.....wonder why??)
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Old 11-25-2013, 09:54 AM   #16
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We installed 2 Magnum SOC or "BMKs" which match our inverter. I'm sure Trace makes them too which would give you compatibility with your inverter.
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Old 11-25-2013, 10:09 AM   #17
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Originally Posted by brian eiland View Post
Just breezing thru a few of the battery subject threads, and it really does appear that MANY prefer those 6-volt Golf cart batteries. I found numerous interesting discussions, and this one brief one: Trawler Forum - View Single Post - Time for new batts, should i go 12v or 6v? Time for new batts, should i go 12v or 6v? (Did not read all way thru this subject thread, but it appears as though there was lots of good info. BUT it was 'closed off'.....wonder why??)
We are staying with 8D's. An alternate to them is not the problem. But thanks anyways
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Old 11-25-2013, 10:11 AM   #18
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We found these on sale at Sams Club
Duracell® AGM Deep Cycle Marine and RV Battery - Group Size 31DTMAGM - Sam's Club
HTH S
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Old 11-25-2013, 10:13 AM   #19
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We installed 2 Magnum SOC or "BMKs" which match our inverter. I'm sure Trace makes them too which would give you compatibility with your inverter.
I tried looking up one that's a trace with no luck, the inverter is an original 03. Probably just go with an Victron unit.
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Old 11-25-2013, 10:37 AM   #20
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Thanks for the link, but I'm in need of 8D's and 4D's.
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