Connect with us

Mixing & Matching PV Panels

Discussion in 'Photovoltaics' started by Brian Graham, Mar 20, 2007.

Scroll to continue with content
  1. Brian Graham

    Brian Graham Guest

    Obviously the panel voltages must be the same, but is there a problem mixing and matching different size/manufacturers PV panels together?

    Ex, Getting a 200W BP panel and later on adding a No-Name 150W panel.

    Downsides?

    What about the same panels from the same manufacturer, but from different batches? For example a friend bought 150W panels which ended up to be about 145W iirc. A friend of his got the same panel from a different batch and wound up with 155W.

    I'm asking from the vantage point of adding panels slowly over time. Anything to watch out for? Or should I be planning on buying them in sets of 4 or whatever?

    My reading never really addressed the issue, so I'm presuming there are really no concerns mixing and matching..
     
  2. Erdemal

    Erdemal Guest

    A shadow, a mapple leaf or a big bird poo could have the same effect
    on perfectly twin pannels?

    It looks like a converter for each pannel would solve this??? A 100 or
    200 watts converter is not a big deal, it's just the same as a desk
    top power supply ($10) except that it's much more simple (yield ?90%).

    I am new here, forgive my ignorance.

    Erdy
     
  3. Erdemal

    Erdemal Guest

    I was thinking at a DC-DC up converter on each pannel with, in
    example, a ??60v *DC* output then a diode, a common ?capacitor/battery
    then the grid inverter.

    Electronic is fun: each DC-DC converter could be attributed a time
    slot to send it's charge pulse to the capacitor ...

    Back to real world now :(

    Erdy
     
  4. Guest

    With a smart inverter, each panel could have its own MPPT :)

    Nick
     
  5. Erdemal

    Erdemal Guest

    I read about MPPT; converter efficiency is 95%.
    http://www.cipcsp.com/composants/034Mppt.html

    Yes, one can imagine lot of optimizations that very probably
    already exist?

    - pannel connections on twisted pair to allow data exchange
    between all the elements of the 'plant' under a standardised
    protocole. Plug and Play PV: P&PPV
    - up converter to a high DC voltage to minimize current

    Reinventing the wheel :) ... I have a nice site about that:
    http://www.primidi.com/2004/04/05.html

    Erdy
     
  6. Guest

    With the serial interface you describe and a RAM, each panel could have MPPT
    with only one set of MPPT hardware, like a telephone switch with a time-slot
    interchanger vs a space-division multiplexer with a lot more hardware.

    Nick
     
  7. If your system is a simple 12 volts with a battery, you can parallel any
    size PV module that was designed for 12-volt system use.

    The battery state of charge will determine the operating voltage.

    If you have a higher voltage system, the modules should be matched
    current wise since you will basically get only the current of the lower
    current module in a series circuit.
    Bill Kaszeta
    Photovoltaic Resources Int'l
    Tempe Arizona USA
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-