24 volt or 12 volt to mppt

cockneybob2
cockneybob2 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

Comments

  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,036 ✭✭✭✭✭
    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,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

  • Raj174
    Raj174 Solar Expert Posts: 795 ✭✭✭✭
    Yes, it is not only better, but necessary. PV in should be at least twice battery voltage to properly charge with an MPPT controller.

    Rick
    4480W PV, MNE175DR-TR, MN Classic 150, Outback Radian GS4048A, Mate3, 51.2V 360AH nominal LiFePO4, Kohler Pro 5.2E genset.
  • cockneybob2
    cockneybob2 Registered Users Posts: 18 ✭✭
    Thanks Rick
  • cockneybob2
    cockneybob2 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
  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    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 with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
  • cockneybob2
    cockneybob2 Registered Users Posts: 18 ✭✭
    Will do , thanks