Mppt Controllers

Discussion in 'Solar Power' started by Yorick, Jul 9, 2015.

  1. Yorick

    Yorick Funster

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    Last year when I fitted my solar panel, I used one of these 20A controllers..

    http://www.ebay.co.uk/itm/10A-20A-3...ontroller-12-24V-Auto-switch-UK-/350772158545

    I have been reading that the MPPT ones are more efficient and wondering if it's worth changing.

    We'll be mainly in Lanzarote where there's plenty of sun :)


    If it's worth changing, is it just a case of swapping over ?

    And any recommendations of a reasonably priced one please ?


    Many thanks :)
     
  2. Jim

    Jim Ringleader

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    I believe that some can be much more efficient as others, twice in some cases. So It's worth buying a good one. I know @eddievanbitz did tests with some, but I forget the actual result, except I learned that Chinese and cheap isn't the bargain I thought it was.
     
    Last edited: Jul 9, 2015
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  3. Yorick

    Yorick Funster

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    Thanks. I'll PM him :)
     
  4. eddievanbitz

    eddievanbitz Trader - Funster

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    On my on motorhome I have three identical 130 watt solar panels. This gives me the ability to compare regulators in a like for like situation.

    Three "alledged" MPPT regulators gave us a range of 1.9amp - 4.9amp

    The Victron MPPT being the unit that always outperforms others. It retails at about £110 and is available at many outlets.
     
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  5. Trikeman

    Trikeman Read Only Funster

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    Yorick,
    a good MPPT here - been absolutely outstanding all the time its been fitted. External 'dashboard' too so the main controller can be hidden away. She's blinking (fully charged) 90% of the time.
    Got mine from Sunsolar.
    [​IMG]

    [​IMG]

    Hope it helps,

    Regards,

    Trikeman.
     
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  6. cruiser

    cruiser Funster Life Member

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  7. Yorick

    Yorick Funster

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    This looks the daddy :)

    http://www.ebay.co.uk/itm/Victron-E...t=LH_DefaultDomain_3&var=&hash=item46326a3009

    Do you really think the extra cost is worth it ?
     
  8. andy63

    andy63 Funster

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    There seeme no doubt that the mppt is the one to go for ,but then which one.. Having said that my portable came with a pwm controller and without any specific tests seeed to do the same job as my now fixed panel with a mppt controller..
    I suppose the question is does your current set up do what you want or not and does any likely gain justify the cost...
    Best of luck with your decision...
    Andy
    http://solarcraft.net/articles/comparing-pwm-and-mppt-charge-controllers/
     
    Last edited: Jul 9, 2015
  9. andy63

    andy63 Funster

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    Same one I fitted only without the remote panel as I already had a power management panel. As said seems to do the job but no direct comparison such as Eddie has carried out.
    Andy
     
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  10. eddievanbitz

    eddievanbitz Trader - Funster

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  11. Techno

    Techno Funster Life Member

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    If you don't have many watts and you are in Lanzarote it's not worth paying the high price for an mppt as it will make little difference in that climate
    Better to increase your watts surface area for the same or less money
     
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  12. Yorick

    Yorick Funster

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    The pics show all their range. Can select from the drop down list :)

    I assume I need the 75/15 for a 150w panel ?



    BlueSolar MPPT 75/10 (12/24V-10A):

    MAX PV power is 135 Watts at 12VDC, 270 Watts at 24VDC

    BlueSolar MPPT 75/15 (12/24V-15A):

    MAX PV power is 200 Watts at 12VDC, 400 Watts at 24VDC

    BlueSolar MPPT 100/15 (12/24V-15A):

    MAX PV power is 200 Watts at 12VDC, 400 Watts at 24VDC

    BlueSolar MPPT 100/30 (12/24V-30A):

    MAX PV power is 440 Watts at 12VDC, 880 Watts at 24VDC

    BlueSolar MPPT 75/50 (12/24V-50A):

    MAX PV power is 700 Watts at 12VDC, 1400 Watts at 24VDC

    BlueSolar MPPT 100/50 (12/24V-50A):

    MAX PV power is 700 Watts at 12VDC, 1400 Watts at 24VDC
     
  13. Yorick

    Yorick Funster

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    So are you saying that in very sunny places, the controller is less important ?


    And I am thinking of also getting a 100w portable panel as no more space on the rof.
     
  14. Techno

    Techno Funster Life Member

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    There are separate prices for each you have to select one for the associated price
    The 75/15 is widely available at £85 or less but looks very basic.
    I'd very much like to see one with the lid off
     
    Last edited: Jul 9, 2015
  15. Techno

    Techno Funster Life Member

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    I recommend reading the white paper on Victron website
     
  16. eddievanbitz

    eddievanbitz Trader - Funster

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    The main benefit of a "good" MPPT controller is that it can make hay whilst the sun shines, literally. So Its really sunny in the morning, and cloudy in the afternoon, the higher, controlled charge from the MPPT regulator during the morning will be beneficial. If you have a mainly sunny enviroment, and you have a smallish battery bank to store the charge having a more effecient charging regime is pointless.

    The key word here is "mainly sunny" lol as opposed to "rarely sunny
     
  17. Yorick

    Yorick Funster

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    thanks. I'll have 2 x 110a batteries to keep a fridge cold. So if I can get a bit mire power for not big bucks, then good.
     
  18. Yorick

    Yorick Funster

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    P.S. I'd have thought that when sunny all controllers be the same.

    And in poor conditions, the better ones (MPPT) drag more power out.


    Or am I still not getting it ?
     
  19. Techno

    Techno Funster Life Member

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    That's pretty right but read the White paper
    I'm on shitty ship wifi just now so difficult to give you links
     
  20. Yorick

    Yorick Funster

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    So you are agreeing that in sunny places like Lanzarote the gain will be minimal ?

    Found it but it may as well be written in Chinese ;)
     
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