24 volt or 12 volt to mppt

cockneybob2cockneybob2 Registered Users Posts: 18 ✭✭
Hi , is it better to put 2 panels together ln series to form 24 volt to the mppt change controller to change a 12 volt battery bank or does it make no difference


  • littleharbor2littleharbor2 Solar Expert Posts: 1,112 ✭✭✭✭
    Unless you have some shading issues where the panels are located Yes, series wire.
    When you say MPPT that brings up the question, Is your controller a true MPPT controller? There's a lot of bogus Chinese controllers that even have MPPT on the face of the controller.
     Here's an example of a fake.

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric, 700 ah @24 volt AGM battery bank. Plenty of Baja Sea of Cortez sunshine.

  • Raj174Raj174 Solar Expert Posts: 648 ✭✭✭✭
    Yes, it is not only better, but necessary. PV in should be at least twice battery voltage to properly charge with an MPPT controller.

    3600W PV, MNE175DR-TR epanel modified, MN Classic 150, Outback Radian GS4048A, Mate3, 54.4V 207AH LiFePO4 no BMS, 4500W genset.
  • cockneybob2cockneybob2 Registered Users Posts: 18 ✭✭
    Thanks Rick
  • cockneybob2cockneybob2 Registered Users Posts: 18 ✭✭
    Thanks littleharbor 2 it is in fact a cheap Chinese make , should I be worried , can it ruin the batteries if it fails
  • mcgivormcgivor Solar Expert Posts: 2,423 ✭✭✭✭✭
    There are so many knockoffs claiming to be MPPT controllers, some are actually MPPT, others are PWM masquerading as such, but are PWM with a high voltage threshold, please post some links to the controller you have, often more eyes looking can help determine what it is you have.

    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery bank 
    900W  3 × 300W No name brand Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah FLA 24V nominal as a backup system. 
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergencies and welding.
  • cockneybob2cockneybob2 Registered Users Posts: 18 ✭✭
    Will do , thanks 

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