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  • different voltage of panels and combining / other options

    Hello all,
    im a complete noob. i have a running 120w panel with 10a controller, and my brother who moved to another place gave his panel to me and i bought a pwm 30a controller for this.

    my question is. can i combine this both to be able to charge my 12v battery? i basically dont know anything about it so please point me to the right directions

    specifications

    Maximum Power (Pmax): 250w
    Voltage at Pmax (Vmp): 36v
    Current at Pmax (Imp):6.96
    Open-circuit voltage (Voc): 42.48
    Short circuit current (Isc): 7.64a


    Maximum Power (Pmax): 120W
    Voltage at Pmax (Vmp): 17.4V
    Current at Pmax (Imp): 6.91A
    Open-circuit voltage (Voc): 22.0V
    Short circuit current (Isc): 7.28A

    a.)if these are a no go. how can i go about my 250w panel to be able to charge to 12v battery?
    b.) can i somewhat have them run on their own controllers and charge them the same battery (12v battery)

    something like this - http://youtu.be/oTWIbVlo9r8


    please help. i am lost

  • #2
    You will need a minimum 15 amp MPPT controller, and get rid of the 120 watt panel. Otherwise get rid of the 250 watt panel. That 250 watt panel using a PWM controller on a 12 volt battery becomes a 85 watt panel.
    MSEE, PE

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    • #3
      Originally posted by Sunking View Post
      You will need a minimum 15 amp MPPT controller, and get rid of the 120 watt panel. Otherwise get rid of the 250 watt panel. That 250 watt panel using a PWM controller on a 12 volt battery becomes a 85 watt panel.
      Sunking Sir, so 120w panel will not be usable anymore in the mppt setup? what a waste ,i was really hoping i can use them together. but ok. thanks for the sound advice

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      • #4
        What are the specs of the 120 volt panel?
        MSEE, PE

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        • #5
          do i need to change / add my batteries as well(from 12 to 24v)?
          i only now have 1pc 200ah deepcycle ones

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          • #6
            What are the 120 watt panel specs?
            MSEE, PE

            Comment


            • #7
              Originally posted by Sunking View Post
              What are the 120 watt panel specs?
              This is what i have -
              Maximum Power (Pmax): 120W
              Voltage at Pmax (Vmp): 17.4V
              Current at Pmax (Imp): 6.91A
              Open-circuit voltage (Voc): 22.0V
              Short circuit current (Isc): 7.28A

              Comment


              • #8
                Originally posted by sunnyday View Post
                This is what i have -
                Maximum Power (Pmax): 120W
                Voltage at Pmax (Vmp): 17.4V
                Current at Pmax (Imp): 6.91A
                Open-circuit voltage (Voc): 22.0V
                Short circuit current (Isc): 7.28A
                OK assuming you buy a MPPT controller that can take up to at least 70 Voc input voltage, you can wire the two panels in series and run either 12 or 24 volt battery because the Imp of both panels are roughly equal. DO NOT run in parallel or use a PWM controller. It must be MPPT.
                MSEE, PE

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