Interpreting Tristar MPPT 60 calculator results?

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blueskies
blueskies Registered Users Posts: 54 ✭✭
in Solar Beginners Corner #1
This was the results of the calculator for my panels. I have four. Do these results mean I can (barely) use 4 panel if run two of them in series? And that 4 of them in parallel is out of the question? Thanks for any input!



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  • mcgivor
    mcgivor Solar Expert Posts: 3,854 ✭✭✭✭✭✭
    #2
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    Select the nominal voltage which I believe you are using 24V, the results in the image are for 12V if I'm not mistaken.
    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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  • blueskies
    blueskies Registered Users Posts: 54 ✭✭
    #3
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    what if i stick with 12 v batteries?  is that really bad?
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  • blueskies
    blueskies Registered Users Posts: 54 ✭✭
    #4
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    (giving up on running the rooftop dometic ac on solar)
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  • blueskies
    blueskies Registered Users Posts: 54 ✭✭
    #5
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    or maybe there's something to convert a 24v battery bank to run all the 12v appliances i've accumulated over the years?  Much Appreciated!!!
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #6
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    The charge controller capacity is based on output current, so whether pv is wired in series or parallel makes little difference.  Output current for 12v is 2x the current for 24v, so double the controller capacity is needed for 12v vs 24v.

    I run two systems; a 12v one for smaller loads, and a 48v one for larger loads.  There are DC converters available to go from higher voltage to lower.  There are pros and cons to each (2 systems vs DC converter) approach.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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