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  • #1

    Not getting expected output

    I have the following system

    3 strings of 10 Hyundai HiS 290RG panels (Voc 38.8)
    Sunny Boy Rapid Shutdown Device, 2 strings going to one output, 1 string to the other
    Sunny Boy 7.7 1SP US-40 inverter

    When I observe the DC values on my inverter, early in the day the watts from one DC input is half of the other, which I think is expected. However as the sun get higher, eventually one DC input gets to a point where the input with two strings stops increasing while the input with one string keeps increasing. The attached files show an example early in the day and at peak which I hope explains it better.

    It appears as currently set up, I'll never get more than about 6200 W output from this system. Given the inverter can do 7700 W and I have oversized my array, I am disappointed in this. I've raised this issue with my installer and he has been slow to respond. So I thought I would run it by this group to better guage what my problem is.

    Is this just an issue with inverter settings or am I going to need to change how my hardware is set up to get the potential of this system?

    Or is the inverter working the way it should and this is all I will ever get? 70% of panel peak output seems low.

    Thanks, Steve
    Attached Files
    Last edited by plannersteve; 05-04-2018, 01:02 PM.
    Sunny Boy 7.7
    30 Hyundai 290RG
    Tags: None
  • #2
    I do not know why but it looks like the current input to Channel B may be limited to 10 amps max.

    Comment

    • #3
      I did find the solution for this shortly after posting. One is able to split one of the outputs from the rapid shutdown device and connect to both the A and B channels of the inverter. The other output goes to the C channel. I'm wired up that way now and problem solved! I attached the technical info document in case it is of help to others.
      Attached Files
      Sunny Boy 7.7
      30 Hyundai 290RG

      Comment

      • #4
        Originally posted by plannersteve View Post
        I did find the solution for this shortly after posting. One is able to split one of the outputs from the rapid shutdown device and connect to both the A and B channels of the inverter. The other output goes to the C channel. I'm wired up that way now and problem solved! I attached the technical info document in case it is of help to others.
        That uses only two MPPTs as A and B are tied together in parallel....
        OutBack FP1 w/ CS6P-250P http://bit.ly/1Sg5VNH

        Comment

        • #5
          Originally posted by ButchDeal View Post

          That uses only two MPPTs as A and B are tied together in parallel....
          Is that a problem? How would I be able to use all 3 MPPT's?

          I attached a picture of the panel installation in case that matters.

          Thanks,

          Steve
          Attached Files
          Last edited by plannersteve; 05-05-2018, 02:07 AM.
          Sunny Boy 7.7
          30 Hyundai 290RG

          Comment

          • #6
            Anybody else not able to view photos lately? I also notice on the photo's link they all say 1 view., like nobody has been able to open the link.

            Comment

            • #7
              Originally posted by Mike 90704 View Post
              Anybody else not able to view photos lately? I also notice on the photo's link they all say 1 view., like nobody has been able to open the link.
              This current thread only has PDF's which I seldom use my limited bandwidth for. Photos seem to be working

              Help me open this breaker : ArcFlash_1.jpg

              (PS - I'd use a fiberglass hand crank, that looks like metal)
              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

              • #8
                Originally posted by Mike90250 View Post

                This current thread only has PDF's which I seldom use my limited bandwidth for. Photos seem to be working

                Help me open this breaker : ArcFlash_1.jpg

                (PS - I'd use a fiberglass hand crank, that looks like metal)
                Cant open this either. Probably has something to do with this new laptop.

                Comment

                • #9
                  I hope you get problem solved but that is a nice looking home with a beautiful view , what state is this ? beautiful.jpg
                  9.36 grid tied, Phoenix Arizona

                  Comment

                  • #10
                    Originally posted by plannersteve View Post

                    Is that a problem? How would I be able to use all 3 MPPT's?

                    I attached a picture of the panel installation in case that matters.

                    Thanks,

                    Steve
                    That's not a problem. Since two of your strings are wired in parallel at the rapid shutdown box, your A and B MPPTs are essentially working in tandem. That's fine - your entire array is co-planar so it doesn't matter much at all. If your strings were pointed in different directions, you'd want them on different MMPTs, but not the case here. You can't use all 3 MMPTs unless you add another shutdown box but that would be a waste of time and money. You're good.

                    Comment

                    • #11
                      Originally posted by Kingram View Post
                      I hope you get problem solved but that is a nice looking home with a beautiful view , what state is this ? beautiful.jpg
                      Thanks Kingram. The house is near Sandpoint, Idaho.
                      Sunny Boy 7.7
                      30 Hyundai 290RG

                      Comment

                      • #12
                        Originally posted by DaveDE2 View Post

                        That's not a problem. Since two of your strings are wired in parallel at the rapid shutdown box, your A and B MPPTs are essentially working in tandem. That's fine - your entire array is co-planar so it doesn't matter much at all. If your strings were pointed in different directions, you'd want them on different MMPTs, but not the case here. You can't use all 3 MMPTs unless you add another shutdown box but that would be a waste of time and money. You're good.
                        Thanks Dave. Now I just need a sunny day to see if I can now max out the inverter.
                        Sunny Boy 7.7
                        30 Hyundai 290RG

                        Comment

                        • #13
                          Originally posted by Mike90250 View Post

                          This current thread only has PDF's which I seldom use my limited bandwidth for. Photos seem to be working

                          Help me open this breaker : ArcFlash_1.jpg

                          (PS - I'd use a fiberglass hand crank, that looks like metal)
                          Nice 40 Calorie suits, but where is his buddy's shepherd's hook????
                          https://pvoutput.org/list.jsp?sid=54099

                          Comment

                          • #14
                            Originally posted by NukeEngineer View Post

                            Nice 40 Calorie suits, but where is his buddy's shepherd's hook????
                            If there is an Arc Flash I would expect his buddy would get hit by his body being thrown back.

                            If you have to don a moon suit the blast expected can be big when it expands. I have seen a big Arc Flash personally and it is not pretty.

                            Comment

                            • #15
                              Originally posted by SunEagle View Post

                              If there is an Arc Flash I would expect his buddy would get hit by his body being thrown back.

                              If you have to don a moon suit the blast expected can be big when it expands. I have seen a big Arc Flash personally and it is not pretty.
                              Understood. Where I worked, if the job needed a buddy, he better have a hook.
                              https://pvoutput.org/list.jsp?sid=54099

                              Comment

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