Battery Charger for 2 x 105ah Deep Cycle Batteries





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  1. #1
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    Default Battery Charger for 2 x 105ah Deep Cycle Batteries

    Hi All

    I have 2 x 105ah Deep Cycle Batteries in my trailer (Marine &RV E-Nex XDC31 MF) 3 years old.

    I have an HCDP MK4 panel that is supposed to keep them charged.

    Lately I have been battling to keep my NL 90L going all night (-4 Freezer and 0 Fridge). The fridge is set to cut out at 11v which I can confirm with the battery monitor it shows 11v. So it goes from 12.6v to 11v overnight. Upon testing the draw from the fridge it is exactly what the specs says. It draws between 2-3 amps.
    Testing my batteries 12 hrs after charging them separately and they are at rest with no loads they read 12.5 and 12.6. Then when tested the next day they read 12.3 and 12.4. This tells me they are not holding charge.

    I suspect two things A. My batteries are on their way out and B. The HCDP panel is not able to charge 2 batteries in parallel effectively.

    Some questions if I may.
    Would it help putting them through a recondition process on the Ctek MX10 to try and restore them?
    Or should I just replace them?

    Regards
    David

  2. #2
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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    That restore function seldom works. It is a last resort for when your batteries are REALLY stuffed already. Now, you will only stuff them up.

    Seems to me you might with a bit of discipline still get a year or two out of them.
    Nico Swart

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  3. #3
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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    But yes, dont that MK4 units put out 30 amps?

    Ths should be more than enough. My D250S does max 20A and this is fine for my 150Ah battery.

    So the batteries might be moeg yes.
    Nico Swart

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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    Rudolf Ras
    Donít blame yourself over past mistakes. Itís like driving down the N1 while looking in the rear view mirror only.

    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 851 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 111 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +60 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 124 000 km

  5. #5
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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    R13 353.00 'n battery?

    Norrvarkin chance!!!!
    Nico Swart

    Triton 2.5DiD D/C with SS
    ZS6NJS

    One day, or Day One. You decide. Tomorrow is promised for no one!

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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    Quote Originally Posted by Die SwartKat View Post
    R13 353.00 'n battery?

    Norrvarkin chance!!!!
    Yip for LiFePo etc - scary!

    That's why decent Lead Acids are still the best way for we camping ouks
    Rudolf Ras
    Donít blame yourself over past mistakes. Itís like driving down the N1 while looking in the rear view mirror only.

    2000 Patrol GU 4.2D(onkey) "old-timer" and wise at 851 000 km
    2014 Patrol GU 3.0CRD "teenager" in puberty at 111 000 km
    2007 Echo3 Trailer "the nest" Braked Axle fitted at +60 000 km
    2012 NP300 YD2.5 D/C 2x4 High Rider "platkar" at 124 000 km

  7. #7
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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    Thank you for all the comments. I will attempt to recover the batteries first or just use them for something else.

  8. #8
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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    Quote Originally Posted by DavidT View Post
    Thank you for all the comments. I will attempt to recover the batteries first or just use them for something else.
    Please give feedback here if you did manage to salvage them.
    Nico Swart

    Triton 2.5DiD D/C with SS
    ZS6NJS

    One day, or Day One. You decide. Tomorrow is promised for no one!

  9. #9
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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    If you dont supply a panel with 30A he cannot put out 30A. Just come back from Moz, 4 days sun in 3 weeks. No panel can produce anything unless you have sunlight. As I has said previously I have 300w on solar panels and is able to extract some UV to keep me going for 2 days before supplementing. To maximize generator output for 2 batteries you can use a 50A charger. Look at older posts which explain everything.

  10. #10
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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    Quote Originally Posted by Die SwartKat View Post
    Please give feedback here if you did manage to salvage them.
    My Aplogies for only getting back to this post now.

    In my attempts to rocover these batteries.........nothing really changed. Im still getting the same readings.

    I will try it multiple times over the next couple of weeks.

    Regards
    David

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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    Quote Originally Posted by DavidT View Post
    The HCDP panel is not able to charge 2 batteries in parallel effectively.
    Should not be the issue. Assuming the HCDP box is connected to 220V for charging?

    Sure way to check a battery is to charge it properly, let it settle for hour or so and then connect a 12V bulb to it for example, something you know how much it draws constantly, for some time, and check the volts again, then compare its capacity with what was drawn from it.

    Had the same issue with a battery in my camper and the HCDP box. In the early mornings the fridge died. Normal test didn't indicated any issues with the battery. The bulb test showed its capacity was reduced to about 60%. Replaced the battery and the fridge was happy.
    Last edited by JLK; 2019/11/24 at 08:10 PM.
    Johan Kriel

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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    This is the way I also test a battery for capacity. I use a single filament headlight bulb drawing 4.5A and one can monitor the voltage over a 1-3 hour period. Voltage should stay well up. I have found most of the time a battery test as done by the battery places only check the short term ability of a battery while with a camping setup one needs the current over about a 16 hour period and that is where most batteries cannot provide.

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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    Quote Originally Posted by ekkekan View Post
    This is the way I also test a battery for capacity. I use a single filament headlight bulb drawing 4.5A and one can monitor the voltage over a 1-3 hour period. Voltage should stay well up. I have found most of the time a battery test as done by the battery places only check the short term ability of a battery while with a camping setup one needs the current over about a 16 hour period and that is where most batteries cannot provide.
    Here's a fairly easy PCB that you can build to provide a constant current discharge of your batteries. This will allow you to measure tha actual Ah capacity of any battery.
    https://www.youtube.com/watch?v=8uBcywBUTkw
    If you look in the Instructables site it provides the components required.

  14. #14
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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    Quote Originally Posted by ekkekan View Post
    This is the way I also test a battery for capacity. I use a single filament headlight bulb drawing 4.5A and one can monitor the voltage over a 1-3 hour period. Voltage should stay well up. I have found most of the time a battery test as done by the battery places only check the short term ability of a battery while with a camping setup one needs the current over about a 16 hour period and that is where most batteries cannot provide.
    This morning after 17 hours the voltage was at 11.65V which I think is fantastic for a 7Ah battery with the B315 router connected.

  15. #15
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    Default Re: Battery Charger for 2 x 105ah Deep Cycle Batteries

    Quote Originally Posted by ekkekan View Post
    This morning after 17 hours the voltage was at 11.65V which I think is fantastic for a 7Ah battery with the B315 router connected.
    Agreed!
    Those 7Ah SLA batteries are really good value!

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