3x345w panels. With MPPT Controller.

alexis1988alexis1988 Registered Users Posts: 9 ✭✭
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.


  • alexis1988alexis1988 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?
  • PhotowhitPhotowhit Solar Expert Posts: 4,781 ✭✭✭✭
    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, Prosine 1800 and Exeltech 1100, 660 ah 24v ForkLift battery. Off grid for @16 of last 17 years. Assorted other systems, and to many panels in the closet to not do more...lol
  • mcgivormcgivor Solar Expert Posts: 2,500 ✭✭✭✭✭
    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 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.
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