Announcement

Collapse
No announcement yet.

Need help with DIY panels, only getting half power

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts

  • Need help with DIY panels, only getting half power

    Hi,i am new here.i made diy solar panel 800w and solar cell efficiency is 21.6% and each panel out working volt 11 and 7.5Amp.here temperature is 40C.everyday generating 2.5unit to 3unit.i used 4mm glass and slygard 184 encapulation.max power output half.why i am getting half power.i used mppt 40amp and 24volt system.please help

  • #2
    Originally posted by gaurav View Post
    Hi,i am new here.i made diy solar panel 800w and solar cell efficiency is 21.6% and each panel out working volt 11 and 7.5Amp.here temperature is 40C.everyday generating 2.5unit to 3unit.i used 4mm glass and slygard 184 encapulation.max power output half.why i am getting half power.i used mppt 40amp and 24volt system.please help
    Is your voltage or current lower than expected?

    As a test, take an unencapsulated cell (hopefully you have one or two left) and use that as a reference. Compare your panel to that (multiply voltage by N cells of course) by measuring Isc and Voc. Then do the same behind a sheet of glass in case the glass is unexpectedly filtering part of the spectrum. Make sure the temperatures are similar when you compare the two.

    Comment


    • #3
      Could you describe the method you used to calculate the 21.6 % efficiency ?

      Comment


      • #4
        Originally posted by J.P.M. View Post
        Could you describe the method you used to calculate the 21.6 % efficiency ?
        That is probably what the seller of those cells told him.

        Comment


        • #5
          Without linking the listing from eBay here's the title, Most listings of these sunpower cells listed boast this efficiency.

          10 Pcs 3.34W C60 DIY Kit Flexible Solar Cell Sunpower Maxeon 21.8 High Efficiency.


          Cell efficiency and finished panel efficiency are two completely different things.
          Last edited by littleharbor; 09-02-2018, 07:35 PM.
          2.2kw Suntech mono, Classic 200, NEW Trace SW4024

          Comment


          • #6
            Is your glass Low Iron glass, or simply stuff from the hardware store ? Low Iron glass is more transparent to the light than regular glass
            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

            Working...
            X