Can anybody help?

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  • gazz
    Junior Member
    • Aug 2010
    • 4
    #1

    Can anybody help?

    tn.jpeg

    Can anybody tell me what might have happened, had a clean sky all day and when I got home I saw this, big drop in output at 2.00pm. Have had the system for 5 weeks and this is my first full day of sun. (there is no shading at this time)

    The system is grid tie and is 12 x sanyo 240HIT with a Sunnyboy SB3000

    The only thing I noticed is that the voltage was 385V I'm sure it is normally 420V but cannot be sure as the inverter is in the loft space and I do not look at it very often.

    Any ideas, the installer will be taking a look but our experience in the UK is more limited so any clues would be appreciated especially as it will probably be intermittent.

    Gary
    Tags: None
  • Mike90250
    Moderator
    • May 2009
    • 16020
    #2
    The difference between 420V and 385V, is likely just the effect of the panels heating up. Is this a battery system or grid tie ?
    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

    • gazz
      Junior Member
      • Aug 2010
      • 4
      #3
      Originally posted by Mike90250
      The difference between 420V and 385V, is likely just the effect of the panels heating up. Is this a battery system or grid tie ?
      It is grid tie, can you explain the sudden drop?

      Gary

      Comment

      • gazz
        Junior Member
        • Aug 2010
        • 4
        #4
        Originally posted by gazz
        It is grid tie, can you explain the sudden drop?

        Gary
        Also the day was not that warm only about 70F with a good breeze.

        Comment

        • Mike90250
          Moderator
          • May 2009
          • 16020
          #5
          Originally posted by gazz
          It is grid tie, can you explain the sudden drop?

          Gary

          No. You need to examine your system and see if there is a problem with any of the panels.
          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

          • solar_dave
            Junior Member
            • Jul 2010
            • 29
            #6
            Originally posted by Mike90250
            No. You need to examine your system and see if there is a problem with any of the panels.
            Did your inverter throw any errors? are you getting DC voltage off the panels midday?

            The voltage can vary, the other advise to check the panels is also valid.
            [URL=http://phx-solar.dyndns.org:8081/Footprints.html]My TED 5000 system[/URL]
            Sticking it to the power company one watt at a time!
            60 Ningbo Electric 175 watt panels and 12 Canadian Solar 180 watt panels with 2 PVP 5200 Inverters

            Comment

            • Sunking
              Solar Fanatic
              • Feb 2010
              • 23301
              #7
              Originally posted by gazz
              Also the day was not that warm only about 70F with a good breeze.
              Air temps have little to do with the solar panel temps. It may very well be 70 outside, but the panel temps can easily go t0 120.
              MSEE, PE

              Comment

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