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Solar help needed

Discussion in 'Technical Chat' started by GoGoGadget, May 23, 2020.

  1. May 23, 2020 at 9:03 AM
    #1
    GoGoGadget

    GoGoGadget [OP] Well-Known Member

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    I have two 100w Renogy panels wired in parallel and am trying to hook up my Redarc BCDC for my dual battery set up. Ran the wires down and put my meter on them to make sure I had the positive and negative correct and I am showing 19vdc. I double checked that I have them in parallel and not in series and I do.
    Back of the panel says optimum operating voltage is 17.9vdc so I am just a bit over that.

    Is that all good? I just now saw the optimum voltage and was previously thinking it would be putting out 14(ish) like an alternator.
     
  2. May 23, 2020 at 9:11 AM
    #2
    Pickeledpigsfeet

    Pickeledpigsfeet Well-Known Member

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    AFAIK The BCDC will manipulate the voltage to whatever battery type you select. It takes the unregulated volts from the panels and the regulated volts from the alt and creates a stable charging cycle out of them.

    Mine is going into a camper and isnt hooked up yet, but that is how all their documentation describes the system.
     
  3. May 23, 2020 at 9:15 AM
    #3
    Pickeledpigsfeet

    Pickeledpigsfeet Well-Known Member

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    Panels in parallel stack their amps, in series they stack their voltage. So having 2 panels in parallel, I would expect to see <19v.
     
  4. May 23, 2020 at 9:24 AM
    #4
    windsor

    windsor Just a guy

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    If you are checking it without being hooked to anything, you are checking open circuit voltage not operating voltage.
     
  5. May 23, 2020 at 9:50 AM
    #5
    GoGoGadget

    GoGoGadget [OP] Well-Known Member

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    Yeah. Was checking straight off the panels. So is 19vdc appropriate for that?
     
  6. May 23, 2020 at 10:53 AM
    #6
    windsor

    windsor Just a guy

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    Yep. I believe that is about what my Renogy panels have when disconnected.
     
    GoGoGadget [OP] likes this.
  7. May 23, 2020 at 5:58 PM
    #7
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    You should be fine

    What specific REDARC do you have?
     
  8. May 23, 2020 at 6:17 PM
    #8
    GoGoGadget

    GoGoGadget [OP] Well-Known Member

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    BCDC 1225D

    I got everything hooked up and it seems fine.
     
  9. May 23, 2020 at 6:28 PM
    #9
    destin_meeks

    destin_meeks I used to fix people's crappy stereos

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    Oh yeah that unit has MPPT built in so it takes something like up to 32v, and uses it more effectively than a standard charger.
     
  10. May 24, 2020 at 7:26 AM
    #10
    Rorschach

    Rorschach Active Member

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    I have this same system, the BCDC 1225D. What configuration did you set with your orange wire? For my own curiosity, where did you attach your blue wire?
     
  11. May 24, 2020 at 7:39 AM
    #11
    GoGoGadget

    GoGoGadget [OP] Well-Known Member

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    I didn’t. I just taped them up and zip tied them to the wire bundle. Tacoma doesn’t have a smart alternator and I selected the standard 14.6v charging profile so the wires did not need to be connected.
     
  12. May 24, 2020 at 7:44 AM
    #12
    Rorschach

    Rorschach Active Member

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    Great, that's what I have. I have been reading all these threads about smart charging or not and has me second-guessing myself.
     
  13. May 24, 2020 at 8:01 AM
    #13
    GoGoGadget

    GoGoGadget [OP] Well-Known Member

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    Yeah. I have seen folks say on here that we do and we do not have smart alternators. I fell back on Redarc where they show smart alternators having a sensor on the positive battery terminal that communicates back to the alternator. So figured we must not have one since we don’t have that.
     

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