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Old 05-15-2012, 01:50 PM   #1
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Default Best charger for AGM battery?

I searched around and couldn't find an answer to the above question. I am looking to install a charger for my 3 diehard AGM 31M batteries on my mako 250. The boat has shore power installed and we left a space for the charger. After some hard rains, I decided it would be best to have one. Let me know what brand and size you guys have. I am looking for a quality charger and a possible charger/inverter combo. Thanks
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Old 05-15-2012, 02:03 PM   #2
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And I'd like to piggyback on to this with an additional question.

I have a 30 amp Genius charger installed for my 3 flooded cell batteries. I have to replace the house battery and want to know if my 30 amp charger will be sufficient if I switch that one to an AGM battery. (The house battery is isolated so the mix of wet cell and agm should not be an issue.)

Apparently the recommended minimum is 40 amp chargers for agm's to help avoid sulfation.
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Old 05-15-2012, 02:22 PM   #3
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I have used a promariner charger for 4 AGM's for 4 years with no problems.

Pro mariner quad 300 charger
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Old 05-15-2012, 04:59 PM   #4
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You want the best????

http://www.progressivedyn.com/prod_d...rs_pd2100.html
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Old 05-15-2012, 05:07 PM   #5
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Xantrex 3 bank 40 amp
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Old 05-15-2012, 05:14 PM   #6
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My Charles 3 bank 40 amp works awesome for me with zero issues.
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Old 05-15-2012, 05:15 PM   #7
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Stealth One AC + DC charging.
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Old 05-15-2012, 05:18 PM   #8
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One time I answered a similar thread and repeated what an engineer at Charles Charger had just told me about their chargers and the Sears DieHard Platinums but some Hull Truth experts quickly chimed in pointing out that the engineer at Charles didn't know chit...
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Old 05-15-2012, 05:25 PM   #9
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So five answers and 5 different responses. Does that mean just about anyone is good enough?
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Old 05-15-2012, 05:41 PM   #10
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The engineer at Charles told me that their tests on the DieHard Platinums show that the flooded cell charging pattern is most effective for those batteries. Give them a call and I am sure they will help.
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Old 05-15-2012, 06:19 PM   #11
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I'm using a ProMariner Protournament 200 (20 amps per bank) on the flooded cell profile on the same batteries you have. It works fantastic. I'm not sure why a 40 amp charger is necessary.
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Old 05-15-2012, 06:36 PM   #12
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I just bought a DieHard Platinum charger today and new Platinum batteries. They are charging at the DieHard Platinum setting at 40 AMPs.

It says to charge them at 40 AMPs but what happens if you trickle charge them or do a 15 AMP charge? Any damage?
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Old 05-15-2012, 07:53 PM   #13
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xantrex
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Old 05-16-2012, 04:31 AM   #14
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I am on replacing my promariner quad as it took a poop for the second time in 6 years. Trying something different this time around
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Old 05-16-2012, 07:28 AM   #15
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If you really want the best for your expensive AGMs, get a Newmar. Newmar is pretty accepted as #1. High end builders all put Newmars in. Also more expensive than the others, but you get what you pay for.
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Old 05-16-2012, 08:56 AM   #16
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I asked the same question last year and the technical folks at Marinco recommended this charger:

http://marinco.com/product/20-amp-du...attery-charger

which is what I have installed now for two Optima D31 batteries. So far it has worked great. They said it has AGM batteries in mind.
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Old 05-16-2012, 09:05 AM   #17
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Quote:
Originally Posted by Glen E View Post
I have used a promariner charger for 4 AGM's for 4 years with no problems.

Pro mariner quad 300 charger
At Glenn's suggestion I have been using a promariner on my AGM's almost 2 years without any issues.
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Old 05-16-2012, 10:12 AM   #18
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Quote:
Originally Posted by pplourd View Post
I asked the same question last year and the technical folks at Marinco recommended this charger:

http://marinco.com/product/20-amp-du...attery-charger

which is what I have installed now for two Optima D31 batteries. So far it has worked great. They said it has AGM batteries in mind.
DieHard Platinum batteries are *supposed* to be charged at 40amps. I have a DieHard charger that supports Platinum batteries and when you set it to charge a Platinum battery it defaults to 40amps.
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Old 05-16-2012, 10:21 AM   #19
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Quote:
Originally Posted by keithelder View Post
DieHard Platinum batteries are *supposed* to be charged at 40amps. I have a DieHard charger that supports Platinum batteries and when you set it to charge a Platinum battery it defaults to 40amps.
where did you get this number so I can verify? Let me know. Thanks
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Old 05-16-2012, 10:53 AM   #20
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Quote:
Originally Posted by skmag357 View Post
where did you get this number so I can verify? Let me know. Thanks
Well I remember reading it on THT at one time and just happened to remember it.

But... my DieHard Platinum charger by default and it says so in the manual defaults the Platinum batteries to 40 amp.

Now Odyssey makes the DieHard Platinum batteries and my group 34's have the same specs. That may help you as well.
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