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  1. #1
    Join Date
    May 2003
    Location
    Exmoor. Boat in Dartmuff.
    Posts
    2,728

    Default AGM vs deep cycle

    Time to replace the house batteries. We do not use the house batteries for engine start purposes. We spend a lot of time on the boat during the summer and charge with wind/solar with generator and sterling smart charger as backup. We tend to use the refrigerator full time and moderate use of pressure water/pcs/tablets etc. When not on board we have several low drain items on permanently. Over the winter we are usually on mains power.

    Question is should we go for something like https://www.batterymegastore.co.uk/l...kook-dc31.html or pay somethhing like twice the price for AGMs.

    Confused of Exmoor
    Remote boat monitoring/control For peace of mind
    http://www.skippersmate.co.uk

  2. #2
    Join Date
    Dec 2014
    Location
    N of Ardnamurchan, winter Loch Melfort
    Posts
    926

    Default Re: AGM vs deep cycle

    I changed to Trojan T145s - which are true deep cycle batteries, and not a 'marine' hybrid - a couple of years ago and not regretted it a minute. Rock solid amps all the time. Worth every penny of the (not inconsiderable) cost.

  3. #3
    Join Date
    May 2016
    Location
    Suffolk
    Posts
    8,021

    Default Re: AGM vs deep cycle

    If i was fitting SLA batteries i'd fit these ; https://www.batterymegastore.co.uk/h...e-battery.html

    For AGM, i'd probably fit these ; https://www.batterymegastore.co.uk/b...-ax31-950.html

    You could look at deep cycle Trojans, but then you are facing a £600 bill.

    At the moment, i'm using 3 of the XL31s, they work well and my solar panels mean that i very rarely have to use the mains charger or run the engine during the Summer. If i was buying new today, i might consider the AGMs.
    Last edited by PaulRainbow; 19-09-19 at 08:32.
    Rainbow Marine.
    www.rainbowmarine.co.uk

  4. #4
    Join Date
    Jan 2011
    Posts
    5,753

    Default Re: AGM vs deep cycle

    My use is similar to yours. I have Trojan T105s which are now 10 years old and still going strong.

  5. #5
    Join Date
    Jun 2013
    Location
    Hopefully somewhere warm
    Posts
    9,640

    Default Re: AGM vs deep cycle

    Quite an in depth ebook over on Morgan Cloud might be worth a years subscription if you're spending a load...
    https://www.morganscloud.com

  6. #6
    Join Date
    Jul 2006
    Location
    Emsworth Hants
    Posts
    12,573

    Default Re: AGM vs deep cycle

    On the long diastance boats we saw the most popular deep cycle battery was theTrojan, we had two in series.

  7. #7
    Join Date
    May 2014
    Location
    March
    Posts
    572

    Default Re: AGM vs deep cycle

    You could also consider these:

    https://proinsosolar.com/sagm-06-220.html

    True deep cycle AGMs batteries.

    I ordered 4 at approx £165 plus VAT each, Proinso quoted over £100 for pallet delivery, I arranged my own at approx £55.

    Expensive initial cost, and more work involved arranging your own delivery, but (for AGMs) I couldn't find much else that gives 1,700 cycles at 50% DOD & a 10 year warranty, I couldn't find them stocked elsewhere in the UK.
    1976 Westerly Centaur, GEMINI

  8. #8
    Join Date
    Oct 2004
    Location
    somerset
    Posts
    236

    Default Re: AGM vs deep cycle

    I am also in the process of changing my batteries but have opted for low tech approach.

    Current battery set up is 3 x 100 amp wet lead acid car batteries combined house and starter pack. They have been in the boat for nine years and still appear to be fine.

    They are charged by alternator and solar panels and require only one charge from a charger at the start of the season after having been left all winter.

    The reason for changing is that I have experienced how quickly a battery can die at the end of its life and I don't want to be caught out.

    I'm in Holland and it seems that only batteries over 100 amps are now available as wet cell, so I have bought 2 x 190 amp wet cell batteries. They cost the equivalent of £370.

    The reason for sticking with wet cell batteries is that, if they have been overcharged, the electrolyte can be topped up. With Sealed and AGM batteries, overcharging results in death of the battery. I also do not need sophisticated ( expensive ) charging systems to ensure longevity which means less electronics to go wrong.

    I am a firm believer in the KISS principle!

  9. #9
    Join Date
    May 2001
    Location
    UK East Coast
    Posts
    36,640

    Default Re: AGM vs deep cycle

    Quote Originally Posted by pessimist View Post
    Question is should we go for something like https://www.batterymegastore.co.uk/l...kook-dc31.html or pay somethhing like twice the price for AGMs.
    With ordinary "sealed" maintenance-free batteries, the secret to long life is not to discharge them excessively. So it's cheaper in the long run to buy an extra one or two batteries and create a large battery bank. On my old boat, I used to get at least 8 years out of a set of maintenance-free batteries. They have a large reserve of electrolyte - I cut a hole in one when the "green eye" indicator went black, and found that the plates were still well covered.

    I quite like AGM batteries, which I have on my current boat, they are theoretically much less prone to internal short failures, they are clean, and they can accept high charging rates. And they're not twice the price!

    Either type would do the job for you. But I reckon that adding an extra one or two batteries to your bank is one of the best investments you can make.

  10. #10
    Join Date
    Jul 2018
    Location
    Bewdley, Worcs
    Posts
    513

    Default Re: AGM vs deep cycle

    EFB technology seems to be the order of the day .. even the car manufacturers are moving from AGM to EFB.

    Simpler charging regime than AGM and good results from the "motorhome" brigade.

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