DC-DC Charger Comparison - Page 3





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  1. #41
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    Default DC-DC Charger Comparison

    Quote Originally Posted by Dungbeetle View Post
    OK, but:

    At least 25 of the 40odd posts in this thread mentions (or the comments are linked to) DC-DC that has solar input
    Ok, but:

    On the list there is a Solar MPPT option. In other words the list caters for chargers with AND without MPPT.

    Not everyone wants to lug around the extra solar panels, some people just want something that can replace their ancient solenoid system
    Last edited by MrTolbos; 2020/02/10 at 09:54 AM.

  2. #42
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    Default Re: DC-DC Charger Comparison

    If buying one now, I think it would be worth to get one that is LifePO4 capable. Very soon that will be the battery standard.

    I've got a HCDP 12V 12A Dual Purpose DC to DC Charger DCDC12A tha tI'm looking to replace now for this reason.
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  3. #43
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    Default Re: DC-DC Charger Comparison

    Yep.

    Which MPPT would you recommend to add to the Orion Tr Smart if one needs Pv input
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  4. #44
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    Default DC-DC Charger Comparison

    Quote Originally Posted by Dungbeetle View Post
    Yep.

    Which MPPT would you recommend to add to the Orion Tr Smart if one needs Pv input
    Victron SmartSolar 100/20. Thatís actually all I currently have (yes only charging from solar, not alternator) still considering if I really need to add the orion.

    (Yes I threw out my Projecta 25 since my first post on this thread, it fried my primary battery)
    Last edited by MrTolbos; 2020/02/10 at 10:07 AM.

  5. #45
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by Kortgat View Post
    If buying one now, I think it would be worth to get one that is LifePO4 capable. Very soon that will be the battery standard.

    I've got a HCDP 12V 12A Dual Purpose DC to DC Charger DCDC12A tha tI'm looking to replace now for this reason.
    Careful

    The HcdP 12V 12A is actually a constant voltage charger,
    Meaning it delivers a max of 12A until the battery takes virtually no more current at 14.2V

    NOW - That is exactly what you want to feed the BMS of a LifePO4 - you do not need to change.

    But - LifePO4 batteries can accept a lot of current, so remaining with the 12A unit only limits your rate of charge vs what the battery can take.

    A trick solution is to add another HcdP 12A unit in parallel to your existing one. Bingo : you then have 24A LifePO4 ready DC-DC charger for R2000 + you can add some more solar panels.
    Last edited by Dungbeetle; 2020/02/10 at 10:20 AM.
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  6. #46
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by Kortgat View Post
    If buying one now, I think it would be worth to get one that is LifePO4 capable. Very soon that will be the battery standard.

    I've got a HCDP 12V 12A Dual Purpose DC to DC Charger DCDC12A tha tI'm looking to replace now for this reason.
    Don't you think lead-carbon batteries pricewise @ R3000 /100A/h is a better cheaper option and you can charge it with a normal DC-DC
    Last edited by Lofty; 2020/02/10 at 10:40 AM.
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  7. #47
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by Dungbeetle View Post
    Careful

    The HcdP 12V 12A is actually a constant voltage charger,
    Meaning it delivers a max of 12A until the battery takes virtually no more current at 14.2V

    NOW - That is exactly what you want to feed the BMS of a LifePO4 - you do not need to change.

    But - LifePO4 batteries can accept a lot of current, so remaining with the 12A unit only limits your rate of charge vs what the battery can take.

    A trick solution is to add another HcdP 12A unit in parallel to your existing one. Bingo : you then have 24A LifePO4 ready DC-DC charger for R2000 + you can add some more solar panels.
    Wow, that is excellent info. No-one tells you that. Thank you. Are LifePO4's happy with 14.2 v max charge, I believe they need a bit more than that?
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  8. #48
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by Lofty View Post
    Don't you think lead-carbon batteries pricewise @ R3000 /100A/h is a better cheaper option and you can charge it with a normal DC-DC
    Well yes, because the price of LifePo4 has come down and you can use nearly all of the battery at near constant voltage without damaging it.

    A 100AH lead whatever, you should only deplete 30% to preserve the battery, so effectively you only have a 30AH battery, perhaps 40AH if you push it.

    An equivalent LifePo4 gives you say 90AH of usable capacity. Triple that of the lead unit.

    A 120AH Lifepo4 can be had for around R 6000.00 these days, that's 4 times the capacity for double the price and a much longer theoretical life (which remains to be seen). hence if you buy a DC DC charger now, make sure it will work with LifePo4, even if you don't have such a battery yet. Your next one after this one will almost certianly be a LifePo4.

    Good news, as per the previous post, is that the basic HCDP unit I have seems to be LifePo4 suitable.
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    * consumption needs to be seen in the context that the vehicle is towing an Imagine Trailvan 30% of the time


  9. #49
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    Default Re: DC-DC Charger Comparison

    I noticed that National Luna now offers a 40 Amp DC-DC charger. Is this for the same application with just more amps, or is this intended for some specific application that isn't obvious to me? It would be great to get feedback from someone that has one.

  10. #50
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by Kortgat View Post
    Wow, that is excellent info. No-one tells you that. Thank you. Are LifePO4's happy with 14.2 v max charge, I believe they need a bit more than that?
    14.2V is just enough. More is better but not critical as the LiFePO4 BMS will deal with the cell balancing
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  11. #51
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by CalDriver View Post
    I noticed that National Luna now offers a 40 Amp DC-DC charger. Is this for the same application with just more amps, or is this intended for some specific application that isn't obvious to me? It would be great to get feedback from someone that has one.
    The 40 amp National Luna is more or less the same. It has one additional DC input (over and above the solar and alternator inputs of the 25 amp model ). The remote monitor also now ships with slightly improved firmware.
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  12. #52
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by Dungbeetle View Post
    14.2V is just enough. More is better but not critical as the LiFePO4 BMS will deal with the cell balancing
    Thnx. So perhaps will not quite get to 100% charge. 90 or 95% will do for me, just hope it does not damage the battery.
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    2012 Imagine Trailvan 4-Sleeper

    * consumption needs to be seen in the context that the vehicle is towing an Imagine Trailvan 30% of the time


  13. #53
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by Kortgat View Post
    Thnx. So perhaps will not quite get to 100% charge. 90 or 95% will do for me, just hope it does not damage the battery.
    Will get to 100% - just takes longer

    Any decent LiFePO4 12V system ready battery will have a proper BMS to manage and protect the battery...

    FongYongKoo and home built Litium packs with elcheapo BMS might pose a problem.....
    Last edited by Dungbeetle; 2020/02/11 at 07:47 AM.
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  14. #54
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    Default Re: DC-DC Charger Comparison

    Thank you for the info Dungbeetle!
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    * consumption needs to be seen in the context that the vehicle is towing an Imagine Trailvan 30% of the time


  15. #55
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by Kortgat View Post
    A 120AH Lifepo4 can be had for around R 6000.00 these days,
    Where did you see this?
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  16. #56
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    Default Re: DC-DC Charger Comparison

    Here:

    https://lithiumbatteriessa.co.za

    Out of stock currently though.
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