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Combining differing Series Arrays

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  • Combining differing Series Arrays

    I have 4 Mitsubishi 120W panels 17.6V Vmp, 22.0V Voc, 6.84A Imp, 7.36A Isc ...

    I located some Luxen 130W panels 17.6V Vmp, 21.6V Voc, 7.39A Imp, 8.69A Isc

    I plan on 4 series panels per array with 3 arrays in parallel, 12 panels per CC, 2CC's.

    so there would be 1 array of Mits. and 2 of Luxen's on one of the CC's.

    The Mits. Array = 70.4V Vmp, 88.0V Voc, 6.84A Imp, 7.36A Isc
    the Luxen array = 70.4V Vmp, 86.4V Voc, 7.39A Imp, 8.69A Isc....no problems here so far, each array is 4 in series and they are all matched panels

    But what happens when the array outputs are combined? the Vmp's match but the Imp does not?
    Will the lower Imp be what the CC 'sees'?

    Should I reassign the 4 Mitsubishi panels to another job?
    100% Off Grid @ 51* 46' N lat 124* 44' W long

    New House system: coming - 2 arrays @ 2240W
    #1) CL150 & Epanel 12V PVs 4S @140 W , 24V C&D AT-15P AGM @ 950Ah, Linksys wet54g - WiFi bridge, Cotek ST1500W inverter, TBS Omni-charger 30a-24v, ,
    #2) CL150 12V PVs 4S@140W , 24V C&D AT-15P AGM @ 950Ah
    to ADD: E-Panel and inverter
    Honda Eu3000is,Eu1000is

    Guest cabin system: 3 - 70W panels to BS 2000e CC, with 2 - 100 ah 12v SAFT wet NiCd's , 600W TSW Inverter

  • #2

    Re: Combining differing Series Arrays

    Re: Combining differing Series Arrays

    No worries. The Imp only matters in the series connection, just as the Vmp only matters in the parallel one.
    So four of the Mitsu's in one string and four of the Luxen's in another one or two will be fine. The Imp's aren't that far apart here either. If it was a really big difference, fuses would prevent the higher current panels from frying the lower ones if something should go wrong.