MPPT advice

Discussion in 'Solar Power' started by zaskar, Sep 23, 2011.

  1. zaskar

    zaskar Funster

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    :cry:Blimey! What is it they say about a little knowledge being a dangerous thing!:Doh::cry:

    I bought this panel ................
    http://www.ebay.co.uk/itm/185W-solar-panel-/250864987762?pt=UK_Gadgets&hash=item3a68b7ee72 ( 24Volt, 185 Watt )
    to charge the 2 x 110 amp leisure batteries on my 5ver.

    Being disapointed with the output using a "bog standard" (non MPPT) controller, I then spent 73 quid on this........
    http://www.ebay.co.uk/itm/185W-solar-panel-/250864987762?pt=UK_Gadgets&hash=item3a68b7ee72

    ............only it turns out that it's unsuitable for my 24V panel because it wont accept the charge which is too high! Should have realised cos the advert clearly states 12volt only but like an idiot I missed that bit! My fault, no excuses.:cry:

    So, before I bankrupt myself on useless purchases, could somebody PLEASE recomend a sensibly priced MPPT controller which will accept the 24v from my panel and charge my 12 volt batteries.

    Thanks:thumb:
    p.s. If anybody wants to make me an offer on the controller, I'm all ears!:Cool:
     
  2. lunarman

    lunarman Funster

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    The link to the controller appears to be the same as the one to the panel
     
  3. freelanderuk

    freelanderuk Read Only Funster

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  4. zaskar

    zaskar Funster

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  5. aba

    aba

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    personally id contact the seller and ask them if you could exchange it for the 24volt version that they also stock as you didn't read the ad properly and see what they say.
     
  6. pappajohn

    pappajohn Funster Life Member

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    i don't understand why you bought a 24v panel and controller (ok, it was wrong :Doh:) to charge a 12v battery ?

    anyway, the same seller has a 24v controller for £67...but it does say 'Nominal battery voltage = 24v'
     
  7. voyagerstan

    voyagerstan Read Only Funster

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    hi all panels give way more voltage than 12 volts thats why you need a con a regulater . the one just sujested is only 10 amp and will only work with upto 120 watts of solar . you will need a 20 amp regulater to give you abit of leeway . hope this heps stan:thumb:
     
  8. CHRI$

    CHRI$ Funster

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    the mppt controller that you have,states that it has a max imput voltage of 25v?so why is it no good?or am i missing something?:Blush:
     
  9. zaskar

    zaskar Funster

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    I thought about that as I saw they also do a 24v version, but I've been told that although the 24v version will accept the charge from my panel, its only suitable for passing that charge on to a 24v system, not 12v.:Blush:
     
  10. CHRI$

    CHRI$ Funster

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    i think if you read the spec on the mppt controler that you have it will handle the 24v panel and put out 12v:thumb:






    *Store Policy: please visit store page on WARRANTY AND SERVICE for more information.
    --------------------------------

    PRODUCT DESCRIPTION:
    MPPT200 is an MPPT solar charge controller with maximum charging power of 20A. It is compatible with 12V battery systems as well as 12V PV modules (nominal voltage). It is capable of supporting up to 200W PV module with an maximum efficiency of 96%. It is suitable for operators of small, compact PV system who is looking to extract the MAXIMUM POWER from the PV modules.
    *Also available in 24V model – see MPPT400 in a separate listing.
    [​IMG][​IMG]
    MAIN FEATURES:

    • Integrated MPPT capability increases performance by 20~25%
    • Intelligent 3-stage charging optimizes system performance
    • Designed for 12V systems (max 200w)
    • Charging power up to 20A to reduce overall charging time
    • Maximum efficiency 96%
    • Automatic load detection
    • Automatic battery voltage detection
    • Support all popular battery types including wet, sealed, AGM, Gel, or NiCd batteries
    • Large LCD displays for system parameters
    • Full battery protections
    • Suitable for vertical mounting
    [​IMG]

    BATTERY TYPE and CHARGING VOLTAGE

    MPPT-200 @ 12V
    MPPT-400 @ 24V

    BULK
    FLOAT
    BULK
    FLOAT
    Wet
    14.3V
    13.2V
    28.6V
    26.4V
    AGM
    14.3V
    13.4V
    28.6V
    26.8V
    Gel
    14.3V
    13.7V
    28.6V
    27.4V
    NiCd
    14.3V
    14.0V
    28.6V
    28.0V

    SPECIFICATIONS:

    MPPT200
    MPPT400
    ELECTRICAL SPECIFICATIONS
    MPPT Range @ Voltage
    15V~22V@12V
    30V~44V@24V
    Max PV Input Voltage
    MPPT200-25V
    MPPT400-50V
    Max PV Input Current
    12A
    Max PV Input Power
    200W
    400W
    Recommended Battery Type
    Sealed Lead-Acid Batteries, AGM or Gel
    Nominal Battery Voltage
    12V
    24V
    Max Charging Current
    20A
    Ripple Voltage
    <± 1V
    Max Efficiency
    0.96
    Standby Power
    2W
    Charging Schemes
    3 stages, bulk, absorption and floating
    Protections
    Battery Reverse Polarity, Reverse Current at Night, Output Short Circuit, Overload (>110%)
    LCD Indicator
    Solar and Output Power, Battery Voltage, Charging Current, and Fault Conditions
    LED Indicator
    6 LED
     
  11. zaskar

    zaskar Funster

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    I did actually ask that question on here before I bought it and was told that it didn't really matter so long as the controller could handle the imput. The controller which came with it CAN handle the imput but unfortunately is not MPPT and given the size of the panel, I must admit to being VERY disapointed with its output. That's why I'm now looking for a suitable MPPT but its proving difficult to say the least.:Sad:
     
  12. zaskar

    zaskar Funster

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  13. CHRI$

    CHRI$ Funster

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    THE MPPT controller you already have will handle the imput from your pv panal,it will handle 25v imput:thumb:
     
  14. CHRI$

    CHRI$ Funster

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  15. zaskar

    zaskar Funster

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  16. CHRI$

    CHRI$ Funster

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  17. zaskar

    zaskar Funster

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  18. CHRI$

    CHRI$ Funster

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  19. zaskar

    zaskar Funster

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  20. CHRI$

    CHRI$ Funster

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    no i dont think it will?:Sad:
    i think it will sense that its a 45v panel and switch to 24v output,if it was to sense that it was under 24v panel it would switch to 12v output,if it was me i would return the panel,or rewire it down to 2 cells of 22.5 volts,easy to do with a soldering iron and a bit of know how:thumb:
     
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