snoobler
Reaction score
3,682

Profile posts Latest activity Postings Resources About

  • Question about a pool pump - JP21-19/900 - 72VDC, 900w, 1.2HP, 62ft, 92GPM, Solar MPPT Controller -
    I have 4 x 270watt @ 35.5v Solar Panels.
    Will the controller handle 142 volts coming in and deliver the required 92v and 900w if connected in series?
    Or will I have to connect 3 panels in series and 1 panel in parallel to them?
    Or possibly 2 pairs of panels in series and then connected in parallel?

    Attachments

    • paelspecs270w.jpg
      paelspecs270w.jpg
      163.2 KB · Views: 3
    kentf
    kentf
    more info: 4 panels 270W, 35.5V pmax, 7.60A pmax. If I connect them in series would get 1080watts with 142V at 7.6A. Correct? Also purchased a 72vdc pool pump with a 72v Controller. The Controller parameters: Rated current=12A, max input volts=150v, current overload=15A & pump=1000W @ 72v, best working volts=88v. Wouldn’t my 4 panels in series is best and most efficient? Do you recommend another configuration???
    kentf
    kentf
    isn't the vpmax the important one? and not the open circuit voltage?
    snoobler
    snoobler
    Sorry. I took a break shortly after my last response. No. Voc is what will blow a controller up. Series Voc must NOT exceed max PV voltage listed, and you should allow a buffer for cold temps.
    Question:

    Can I safely use an MMPT solar charge controller to charge LiFePO4 batteries using a non-PV input to the charge controller?

    For instance, can I connect a simple 36V 10A DC power supply to the PV input on the MMPT solar charge controller to charge my 24V LiFePO4 battery when PV input is not available?
    Tom
    snoobler
    snoobler
    As long as the PS is within the input parameters of the MPPT, it should be fine.
    T
    TomM
    Great, Thanks. I did not think the MMPT could tell the difference between 36V and 10A from a power supply vs 36V and 15A from solar panels.
    snoobler
    snoobler
    It will be frustrated in its efforts to find peak power as it will always come back to whatever your input settings are. :)
    quick Q for U, is it better to have two 20A MTTP controllers feeding a battery bank or one 40A controller?
    D
    doppler
    I would rather have one, just less to set up and keep an eye on but 40 and especially 60 and up they can get pricey
    RCinFLA
    RCinFLA
    Depends on PV panel matching any any variation in their direction and independent partial shading. If mismatch panels or pointed in different directions having separate MPPT controller is much preferable to even a necessity.
  • Loading…
  • Loading…
  • Loading…
  • Loading…
Top