3x345w panels. With MPPT Controller.

alexis1988
alexis1988 Registered Users Posts: 9 ✭✭
in Solar Beginners Corner #1
Ok my question is, will the 40a MPPT charge controller work with these Panels, wired as parallel to charge 2 (12v batteries 105ah each ,wired as parallel as well.) I think the panels are 24v. Here is back label.
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  • alexis1988
    alexis1988 Registered Users Posts: 9 ✭✭
    edited August 2018 #2
    This is the label of the panels that i would like to buy. Do you think they are good panels? And which is better Mono or poly?
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  • Photowhit
    Photowhit Solar Expert Posts: 6,006 ✭✭✭✭✭
    #3
    Well the math doesn't work well for you, You have 3 x 345 watts of panels for a total of 1035 watts, they should produce about 75% of the STC rating or 780 watts,  780 watts through a MPPT type charge controller at charging voltage for 12 volt, should produce 780/14.5= 54 amps.... You would want to go to a 60 amp charge controller to fully utilize the panels.
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former backup...lol), 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
    - Assorted other systems, pieces and to many panels in the closet to not do more projects.
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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #4
    Regarding mono or polycrystalline, not much difference in output to warrant the extra cost unless space is of concern. Adding to Photowhits comments, MPPT controllers can use cheaper 60 cell panels in the 250W range, but the limitations that a 12V nominal system has reduces total wattage, moving to a 24V nominal system would be advantageous for many reasons, larger array for same controller, smaller conductors, series battery etcetera, is there a reason to limit to 12V? 
    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.
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