Panel Matching

solar_davesolar_dave Posts: 2,313Solar Expert ✭✭✭
OK so the panels have been removed from my roof, guess what, one was shattered and 2 have junction box problems (still working).  I think I would like to replace them.  Our sponsor has A 190 watt panel with a VMP of 36.5 and a VOC of 43.8, the current panels are VMP of 35 and a VSC of 44.0.  Close enough match?

Comments

  • BB.BB. Posts: 26,189Super Moderators admin
    Close enough for parallel matching (Vmp).

    No need need to connect any in series?

    - Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • solar_davesolar_dave Posts: 2,313Solar Expert ✭✭✭
    Yeah so I have 72 panels in 8 strings of 9 panels. Still OK?  If I remember correctly the panels needed to be within 10% on both numbers.



  • BB.BB. Posts: 26,189Super Moderators admin
    What is the Imp of the two panels.

    10% or better much. 5% or better is even nicer.

    - Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • solar_davesolar_dave Posts: 2,313Solar Expert ✭✭✭
    Not listed  on the existing :s

    This is the panel I am proposing:
    IMP= 5.2 amps
    https://www.solar-electric.com/topoint-jtm-190-72m-solar-module.html
  • BB.BB. Posts: 26,189Super Moderators admin
    And your old / existing panel Imp?

    - Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • solar_davesolar_dave Posts: 2,313Solar Expert ✭✭✭
    edited May 18 #7
    BB. said:
    And your old / existing panel Imp?

    - Bill
    Found it!  The damn internet is a wonderful thing. 
    nigbo electric TDB125X125-72-P  http://www.solarhub.com/solarhub_products/4559-TDB125x125-72-P-170W-Ningbo-Solar-Electric-Power
    ISC of existing panels are 5.14.  Would appear to be almost a perfect match.
  • BB.BB. Posts: 26,189Super Moderators admin
    Looks good...

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • solar_davesolar_dave Posts: 2,313Solar Expert ✭✭✭
    Drove up to NAWS in Flagstaff and picked up the panels yesterday.  What a bunch of nice helpful guys working there.  BTW It was still damn cold in Flagstaff yesterday while I was wearing shorts! LOL

    Got a really nice quote for the materials to convert the swimming pool to DC direct drive and get the pool off the Grid tie.  I figure the added/saved kWh would make a difference with the APS bill so that I could probably pay just the minimum every month of the year and the pool gets much improved filtering as it will run for most of the day instead of just a few hours on AC.  The only caveat is it needs to be a bit bigger than normal to accommodate the DE filter and the in-floor cleaning system.
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