Charging deep cycle batteries





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  1. #1
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    Default Charging deep cycle batteries

    I have an old fridge in my trailer that only runs off the batteries. I'm sorted with solar power when in remote spots but when I'm in reach of a 220v power point I want to charge my 2 x 105A deep cycle batteries from mains. I was told a 25A C-Tek would do the job (MXS25) but that's around 5 Grand! Any other suggestions or advice?

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    Benton Charger BX-2 battery charger about 1,300
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    Thanks, looks like the answer Not the BX-5 (25Ah)? I believe it should charge at 10% of total Amperage of the batteries (2 x 105)?

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    Quote Originally Posted by bobpil View Post
    I have an old fridge in my trailer that only runs off the batteries. I'm sorted with solar power when in remote spots but when I'm in reach of a 220v power point I want to charge my 2 x 105A deep cycle batteries from mains. I was told a 25A C-Tek would do the job (MXS25) but that's around 5 Grand! Any other suggestions or advice?
    It all depends what else is on the power.

    Keep in mind that a charger supplying say 7 Amps will have the 7 Amps shared by your load and the batteries. So if your camp is drawing close to 7Amps and the batteries are flat you are on a hiding to nowhere.

    The BX2 may do it, but I would consider the BX5 which is a 25A charger. I think they go for R2.5K - R3K
    Last edited by Fluffy; 2015/04/10 at 11:30 AM.
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    I think the new kid on the block a Victron IP65 15 Amp 7 stage charger for about R1950 is what I will get

    This product looks like its way ahead of the Ctek's both in pricing as well as technology
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    Last edited by mfuwefarmer; 2015/04/10 at 11:37 AM.

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    Well, it all depends on how quickly you need/want to charge.

    Say your 105 Ah batteries are each at 50% DOD, then you'll need to replace the 105 Ah of capacity.

    With a 25 A charger, it will take about 4 hours. A 10 A charger will take 10 hours.

    Edit: Yes, as Fluffy mentioned - also take into account the power drawn from your equipment.
    Last edited by Greg; 2015/04/10 at 11:41 AM.
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    Quote Originally Posted by Greg View Post
    Well, it all depends on how quickly you need/want to charge.

    Say your 105 Ah batteries are each at 50% DOD, then you'll need to replace the 105 Ah of capacity.

    With a 25 A charger, it will take about 4 hours. A 10 A charger will take 10 hours.
    --------

    But as per my post. If the 10A charger is also running two fridges at 8A you only have 2A left for the battery charge.

    EDIT - cross post. We posted at the same time.
    Last edited by Fluffy; 2015/04/10 at 12:00 PM.
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    The frogs are starting to notice that the water is getting warm but it is already too hot to do anything about it.....

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    Tx all, a 20A Victron (1 yr gtee) costs slightly less than the C-Tek (2 year gtee), whilst the Benton 25A is R2829 on iWarehouse - huge saving. Think it is a 2 yr gtee.

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    Speak to Karl at Sinetech, and ask about the 12Volt 30 amp charger, I bought one...awesome unit, R1227:

    Karl Hüllermeier
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    Tel: 011 886 7874
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    Quote Originally Posted by Greg View Post
    Well, it all depends on how quickly you need/want to charge.

    Say your 105 Ah batteries are each at 50% DOD, then you'll need to replace the 105 Ah of capacity.

    With a 25 A charger, it will take about 4 hours. A 10 A charger will take 10 hours.

    Edit: Yes, as Fluffy mentioned - also take into account the power drawn from your equipment.
    True, but some batteries dont like high current for to a long period.

    I know my 120ah specifically states no more then 20A input for longer then 3hours
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    Quote Originally Posted by bobpil View Post
    Tx all, a 20A Victron (1 yr gtee) costs slightly less than the C-Tek (2 year gtee), whilst the Benton 25A is R2829 on iWarehouse - huge saving. Think it is a 2 yr gtee.
    Victron IP65 Blue Power 15 Amp charger as per the spec sheet has a 5 year warrantee and cost less than R2000
    Last edited by mfuwefarmer; 2015/04/10 at 01:18 PM.

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    Quote Originally Posted by silvrav View Post
    True, but some batteries dont like high current for to a long period.

    I know my 120ah specifically states no more then 20A input for longer then 3hours

    Actually not quite true (not you, the post you are referencing above)

    A 25A charger may very well not charge a battery much faster than a 10A charger. Quite simply the current may be high initially for a short time, but it will drop off significantly to a much lower current once the bulk stage is complete. This is especially true of the battery was not very flat. The advantage of the bigger charger here is that we are talking about two 105AH batteries and running the camp electrics at the same time.

    My rule of thumb. If you charge a flat battery in under 10 hours you are very likely causing significant damage. DITTO if the battery temperature rises by more than about 20deg above ambient.
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    Quote Originally Posted by mfuwefarmer View Post
    I think the new kid on the block a Victron IP65 15 Amp 7 stage charger for about R1950 is what I will get

    This product looks like its way ahead of the Ctek's both in pricing as well as technology
    Looks impressive, where do we buy this from?
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    Quote Originally Posted by War-Medic View Post
    Looks impressive, where do we buy this from?
    Try Bushpower or Current Automation & Exsolar in CT

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    Quote Originally Posted by Fluffy View Post
    Actually not quite true (not you, the post you are referencing above)

    A 25A charger may very well not charge a battery much faster than a 10A charger. Quite simply the current may be high initially for a short time, but it will drop off significantly to a much lower current once the bulk stage is complete. This is especially true of the battery was not very flat. The advantage of the bigger charger here is that we are talking about two 105AH batteries and running the camp electrics at the same time.

    My rule of thumb. If you charge a flat battery in under 10 hours you are very likely causing significant damage. DITTO if the battery temperature rises by more than about 20deg above ambient.
    Good rule of thumb....saved in my noggen!

    Problem is, I see more and more, call it "non-smart" chargers popping up in the market that brags about 25-30A charging current. Problem is they charge only at 25/30A and is not a 3 stage smart charger.

    As you said, the battery life will be reduce heavily.
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    We have two issues here - a fridge without its own power pack, and batteries that needs to be charged when 220 volt is available.

    If funding is an issue will consider separating the issues buy buying a dedicated power pack for the fridge, (10 amp for under R 300) and then a green 8 amp 14.4 v 9 stage Intelligent Charger from Midas for about R 700. Problem solved for R 1000.
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