DC-DC Charger Comparison





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  1. #1
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    Default DC-DC Charger Comparison

    So I am in the market for a DC-DC charger and put the following together. Most of the info is straight from the manufactures website or spec sheet. A couple years ago we had very limited choice but things have changed. I think this should be the lot that are available in ZA but if I am missing one please let me know. I am inclined to go for the National Luna but havent made a decision yet. Items in Red are assumed or not 100% confirmed.

    Links to manuals:
    WRND WDB1220B www.4x4direct.co.za/index.php?controller=attachment&id_attachment=3
    Intervolt DCC Pro http://www.intervolt.com/wp-content/...DCC-Manual.pdf
    National Luna NLDC-25 https://www.nationalluna.com/wp-cont...ser-Manual.pdf
    HCDP DCDC20A R02 https://www.hcdpelectronics.co.za/in...&product_id=68
    Ctek D250SA https://www.ctek.com/storage/ma/36b0...nual-UK-EN.pdf
    Redarc BCDC1225 https://www.redarc.com.au/in-vehicle...-regulator-25a
    Projecta Idc25 https://static1.squarespace.com/stat...ion_Manual.pdf
    Ring DCCharge30 https://www.ringautomotive.com/files...structions.pdf

    Notes: National Luna does not charge primary from solar.
    Attached Images Attached Images  
    Last edited by martinlp; 2018/09/20 at 10:01 PM. Reason: updated table, added links


  2. #2
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    Default DC-DC Charger Comparison

    Maybe you can add the max solar Input voltage for each charger also?

    I used the Projecta25 for a few months, but I removed it after it cooked my starter battery.
    Last edited by MrTolbos; 2020/02/10 at 10:10 AM.

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  4. #3
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    Default Re: DC-DC Charger Comparison

    You can add the Projecta IDC 25 (Australian) and the RING DC30 (UK) to your list as well. I personally prefer the Projecta 25a, they do a 45A unit as well. Both have MPPT controller included.

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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by MrTolbos View Post
    Maybe you can add the max solar Input voltage for each charger also?



    I bought the projecta 25A in May, so far very happy with it: (thereís also a 45A model available)

    https://www.projecta.com.au/dual-battery-charger-idc25
    I did add the range for solar input, which includes min/max volts.

    I wanted to limit the selection to locally available units.. did you import or buy locally? if the later can you send me a link so I can get price.

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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by Peter Wheeler View Post
    You can add the Projecta IDC 25 (Australian) and the RING DC30 (UK) to your list as well. I personally prefer the Projecta 25a, they do a 45A unit as well. Both have MPPT controller included.
    Did you buy RingDC30 locally? can you give me price or send me link where to buy?
    Thanks

    Nevermind.. I see 4x4Megaworld stock them.
    Last edited by martinlp; 2018/09/09 at 08:48 PM.

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    Default DC-DC Charger Comparison

    Quote Originally Posted by martinlp View Post
    I did add the range for solar input, which includes min/max volts.

    I wanted to limit the selection to locally available units.. did you import or buy locally? if the later can you send me a link so I can get price.
    My apologies, my eyes totally missed the max input volts part.

    I bought my Projecta 25A from LA Sport in Port Elizabeth, it was R4650 in May. They are now available at 4x4 megaworld for R4484.

    I would buy the Ring RSDC30 if I had the choice again, didnít know of them in May
    Last edited by MrTolbos; 2018/09/09 at 11:12 PM.

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    Default Re: DC-DC Charger Comparison

    The WRND does not charge the primary battery from solar.

    It has an optional wire that connects to the vehicle's "accessory" power feed, which forces it to switch on. Not sure if that is what you mean by "ignition override"?

    The owner's manual leaflet contains a great deal more info than the website, I'll see if it has a more technical description of the charging modes.

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    Default Re: DC-DC Charger Comparison

    Other features that you may want to list that I have become aware of along my journey...

    The HDCP 20A unit can have your load connected to it, and when the alternator is running it will power the load directly from the alternator, allowing the full 20A to be used for charging the aux battery.

    The Ctek can charge the aux battery from solar and alternator at the same time.

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  12. #9
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by HeavyG View Post
    The WRND does not charge the primary battery from solar.

    It has an optional wire that connects to the vehicle's "accessory" power feed, which forces it to switch on. Not sure if that is what you mean by "ignition override"?

    The owner's manual leaflet contains a great deal more info than the website, I'll see if it has a more technical description of the charging modes.
    Cool will update and repost image.
    To be honest the "ignition override" is a bit of a mystery to me as well. It appears that it is not always called the same thing. I believe it has to do with being able to support some of the newer "smart" alternators that adjust voltage more intelligently.

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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by HeavyG View Post
    Other features that you may want to list that I have become aware of along my journey...

    The HDCP 20A unit can have your load connected to it, and when the alternator is running it will power the load directly from the alternator, allowing the full 20A to be used for charging the aux battery.

    The Ctek can charge the aux battery from solar and alternator at the same time.
    Thanks useful information. The issue I had was that not all the suppliers make these niche features notable. I think it might just be the last row where we can put "niche features" in and write the various points.

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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by martinlp View Post
    To be honest the "ignition override" is a bit of a mystery to me as well. It appears that it is not always called the same thing. I believe it has to do with being able to support some of the newer "smart" alternators that adjust voltage more intelligently.
    From what I understand... the WRND (and others) have a safety cut-off... so the primary battery doesn't get drained... The override basically opens the circuit so the unit charges whenever the ignition is turned on... so the safety voltage check is bypassed
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by BobMabena View Post
    From what I understand... the WRND (and others) have a safety cut-off... so the primary battery doesn't get drained... The override basically opens the circuit so the unit charges whenever the ignition is turned on... so the safety voltage check is bypassed
    To close the loop (excuse the pun) from the smart alternator perspective... When a smart alternator is in use and drops the voltage (for what ever reason) to below where the DC-DC chargers threshold for the alternator is, the DC-DC charger may open the circuit, as though the engine is not running. With this override, this voltage threshold is ignored and the dc-dc runs regardless of the voltage from the alternator?

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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by martinlp View Post
    To close the loop (excuse the pun) from the smart alternator perspective... When a smart alternator is in use and drops the voltage (for what ever reason) to below where the DC-DC chargers threshold for the alternator is, the DC-DC charger may open the circuit, as though the engine is not running. With this override, this voltage threshold is ignored and the dc-dc runs regardless of the voltage from the alternator?
    That's my (limited) understanding...
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    Default Re: DC-DC Charger Comparison

    Quote Originally Posted by martinlp View Post
    So I am in the market for a DC-DC charger and put the following together. Most of the info is straight from the manufactures website or spec sheet. A couple years ago we had very limited choice but things have changed. I think this should be the lot that are available in ZA but if I am missing one please let me know. I am inclined to go for the National Luna but havent made a decision yet. Items in Red are assumed or not 100% confirmed.

    Links to manuals:
    WRND WDB1220B www.4x4direct.co.za/index.php?controller=attachment&id_attachment=3
    Intervolt DCC Pro http://www.intervolt.com/wp-content/...DCC-Manual.pdf
    National Luna NLDC-25 https://www.nationalluna.com/wp-cont...ser-Manual.pdf
    HCDP DCDC20A R02 https://www.hcdpelectronics.co.za/in...&product_id=68
    Ctek D250SA https://www.ctek.com/storage/ma/36b0...nual-UK-EN.pdf
    Redarc BCDC1225 https://www.redarc.com.au/in-vehicle...-regulator-25a
    Projecta Idc25 https://static1.squarespace.com/stat...ion_Manual.pdf
    Ring DCCharge30 https://www.ringautomotive.com/files...structions.pdf

    Notes: National Luna does not charge primary from solar.
    So what was the outcome? What did you end up getting?

  18. #15
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    Talking Re: DC-DC Charger Comparison

    Went with the National Luna. Local is lekker . I had a question when I installed and phoned the National Luna guys directly - great support.

    I also upgraded to a Ritar 100AH deep cycle battery. Its been such a pleasure compared to the basic solenoid and high cycle battery I ran before.

    One modification I had to make, I have two 100W solar panels and preferred to run them in series, but that appears to push too much volts to the unit and it disables the solar charging. I made a quick change to the wiring and am now running the panels in parallel which works fine. I do think that the solar charging is not as efficient as my previous Victron MPPT charge controller. It just seems that the Victron charged even in very low light conditions (but I had the panels in series) where as the National Luna Display will show 0 amp charge in low light... but this is a minor thing. I am talking when the sun is nearly set and I can understand that the Victron might perform better as its a dedicated solar charge controller.
    Last edited by martinlp; 2019/02/14 at 09:08 AM.

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  20. #16
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    Default Re: DC-DC Charger Comparison

    I was also looking at the National Luna, but comes with a hefty price tag.

    I was looking at that WRND as the price is right. I don't know if I can justify R5k for a once a year trip. My electrical needs are basic, fridge, lighting and charging devices.

    The other option I was looking at are these two

    https://www.4x4direct.co.za/battery-...ry-system.html
    https://www.4x4direct.co.za/battery-...-combiner.html

    The Battery combiner looks interesting in that you can use the auxiliary battery as a start battery in an emergency.

    My thinking is that I can add a Victron MPPT later on as a add on when my needs increase? The flip side is that I will be stuck with a high cyclic battery system. Though for R1k it's not a massive loss if I have to upgrade it a few years down the line

  21. #17
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    Default Re: DC-DC Charger Comparison

    The WRND is a very cost effective option, but being a bit of a tech junkie, I had to have something with a display so I could see what is going on and the WRND didn't have that option, otherwise it would have been a strong contender.
    If the 5k is difficult to justify, I would certainly go for the WRND as opposed to the combiner and isolator. Having said that, I essentially ran off of a high cycle and isolator (old school solenoid, not solid state) for 5-6 years and managed fine, but at the end the high cycle was not cutting it as I started staying a couple of days at camp sites.

  22. #18
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    Default Re: DC-DC Charger Comparison

    how reliable are these other brands though. I cant find much about them. I did see some older comments about the ''Old WRND'' starting a few fires....that's not terribly inspiring lol

    Or is the old national luna solenoid donkey just the safest and best bet

  23. #19
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    Default Re: DC-DC Charger Comparison

    I believe the WRND has a newer version out.. have read good reviews here about it. Plus it is also locally designed (and probably manufactured). I recall when I looked people were happy with it.

  24. #20
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    Default Re: DC-DC Charger Comparison

    Has anyone got experience with the WRND's and lead Chrystal batteries....

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