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  • Testing panel output

    Hi. I have a single solar panel which is rated at 250 Watts and 36V.

    I want to test the maximum watts output on a clear sunny day and most info suggests that I simply attach a 10A Multimeter to the + and - output cables coming from the panel however each time I try this it simply blows the Multimeter 10A fuse.
    Can anyone suggest a safer way to test the panels output.

    Also I need some advice on running a 24V5A water circulation pump direct from the panel without using a battery.
    I hope to use a Capacitor to overcome the extra current draw on start up and my idea is the pump would continue to run only when there is sufficient output from the panel.

    Appreciate any help offered

    Thanks

    Farticus123

  • #2
    Look at the label on the back of the panel, what are the number for these 2 values
    Isc _______ (short circuit amp)
    Imp _______ (max power amps)
    Then we will know if you can use a 10a meter to measure it.
    Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister

    Comment


    • #3
      Thank you

      ISC 9.58A

      IMP 8.33A

      Comment


      • #4
        If you measure a single 9.58A panel at a time, it should not blow a 10A fuse So try getting a slow blow 10A fuse and use it for this test only. Just one panel at a time. Maybe, if you feel adventurous, try a 12A or 15A fuse. I don't see how a 9.58A panel can blow that, but again, I'm not there to verify you are setting this all up properly.

        BE sure to re-configure meter after measuring amps, or you can mistakenly leave the leads in the amps jack and get a real flash bang surprise when you measure battery voltage.
        Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
        || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
        || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

        solar: http://tinyurl.com/LMR-Solar
        gen: http://tinyurl.com/LMR-Lister

        Comment


        • #5
          Thanks for the info, Problem wss I must have previously blown up the Amps testing innards of both Multimeter.

          Tried out a borrowed one and it worked just fine 9.7 A.

          Any answers on the second part of my question about running the 5A water pump direct from the solar panel without a battery in the circuit.

          I am using a buck boost converter to maintain the volts at 24V as much as possible and using a Capacitor to help with the Motor Start.

          Comment


          • #6
            Originally posted by farticus123 View Post
            ......

            Any answers on the second part of my question about running the 5A water pump direct from the solar panel without a battery in the circuit.

            I am using a buck boost converter to maintain the volts at 24V as much as possible and using a Capacitor to help with the Motor Start.
            a simple buck-boost will not work, unless it's solar aware and works with a current source (PV panels are current sources, not voltage sources)

            What you want is a LCB ( Linear Current Booster ) most large / good solar gear vendors carry them, they are rated for the motor load they power, they have their own storage capacitor, do not use an external cap with them.

            Google solar LCB

            http://ieeexplore.ieee.org/document/...6/?reload=true abstract of longer article
            Last edited by Mike90250; 02-06-2018, 03:10 AM.
            Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
            || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
            || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

            solar: http://tinyurl.com/LMR-Solar
            gen: http://tinyurl.com/LMR-Lister

            Comment


            • #7
              Thanks Mike for your help.

              I have one more question but I will start a new thread as it differs from this discussion.

              Comment

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