back of 310 panels

ws9876
ws9876 Solar Expert Posts: 450 ✭✭✭
in Off Grid Solar & Battery Systems #1
CS 310 watt mono
These panels have a third connector in the middle of the back...what is it for??
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,641 admin
    #2
    Have you tried to measure voltage between the leads and the "patch" on the back?

    I looked through the online information, and did not see anything about it.

    https://www.solar-electric.com/canadian-solar-cs3k-310ms-monocrystalline-310-watt-solar-panel.html
    https://www.canadiansolar.com/upload/8102016807594b1b/70dcb1cb16607d16.pdf

    It would be surprising if that "patch" was electrically connected to the rest of the panel... That would expose high voltage and current from the array to the outside world.

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • billybob9
    billybob9 Registered Users Posts: 141 ✭✭
    #3
    I bought the CS 300w panels and was wondering the same thing. The POS & NEG wires are also in the middle of the panel on each end. Great for attaching clips toward the top or bottom. 
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  • littleharbor2
    littleharbor2 Solar Expert Posts: 2,113 ✭✭✭✭✭
    #4
    When you say "connector" are you referring to the sealed box in the center of the panel? There's no leads coming out of are there? Those type panels are basically two sets of 60 cells in parallel giving the added advantage of not killing all the panel's output if part of the panel were shaded. My best description of that 3rd box would be it is a sort of combiner for the two halves of the panel. 

    2.1 Kw Suntech 175 mono, Classic 200, Trace SW 4024 ( 15 years old  but brand new out of sealed factory box Jan. 2015), Bogart Tri-metric,  460 Ah. 24 volt LiFePo4 battery bank. Plenty of Baja Sea of Cortez sunshine.

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  • ws9876
    ws9876 Solar Expert Posts: 450 ✭✭✭
    #5
    probably
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