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Inverter with double input: 220 volt and pv panels

Discussion in 'Photovoltaics' started by Sandro kensan, Apr 15, 2013.

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  1. Is there an inverter that has double input and one output 220 volt?

    The dual input is one for the photovoltaic panels (1 kWp) and one for
    the grid 200 volt.

    I am grid connected but have not a electricity meter that is able to
    receive power but is able only to output power to my home.

    If the outside grid is in maintenance and is insulate from the electric
    power plant, the outside grid must be non electric connected to my
    photovoltaic plant. Otherwise the maintenance men could be killed.
  2. argusy

    argusy Guest

    I take it you mean - is there an inverter that has a solar array input, a 200V
    grid power input and a separate 200V power output, rather than an inverter that
    uses the 200v power out as the grid input sensor as well.

    Try googling "solar inverters" to see if there's any out there. Read on
    Electricity meters don't receive or generate power, only measure it. I take it
    you mean you don't have a meter that senses a reverse current (when your solar
    array is generating more than your house is consuming)
    I hope you're referring to the inverter here, not a separate petrol/deisel
    generator as "the electric power plant"

    the outside grid must be non electric connected to my photovoltaic plant.
    Easiest thing to do here is turn off the DC circuit breakers between the array
    and the inverter, if you're that worried

    If the electricity regulations in your country are anything like ours (and it's
    REALLY for protection or self-preservation of electricians), then your system
    should be like this:

    grid power in - main circuit breaker - Mains meter/house wiring - solar circuit
    breaker - solar generator - DC circuit breakers - solar array.

    If you really do have a grid connected system, then there's no problem.
    If you lose grid power, the inverter will sense there's no grid power and
    automatically stop producing any power at all. That's the way they're made.

    It doesn't matter if the solar array is still producing power, it just doesn't
    get converted to AC power (and the maintenance team are safe). Isolate the
    array, too.

    If you really worried about the maintenance team's safety, even though the
    inverter isn't producing power, just turn the mains circuit breaker off!!

    IF you don't have one (VERY ILLEGAL) then get one installed immediately.

    on the other scenario I imagined (attaching a separate generator), once you've
    turned the main circuit breaker off, turn the inverter CBs off as well.
    THEN you can attach and run a separate petrol/deisel generator if you really
    need power to your house.

    If you want the inverter running with a separate generator, just make sure the
    generator creates a pure sine wave out, and frequency locked.
    Otherwise, you could destroy the solar inverter!!

    (btw, attaching generators here in Australia is just a little bit naughty).

    If you're after a system that changes over to a separate generator when power is
    lost or maintenance is required, then you should really be using a stand-alone
    system instead of a grid-locked system.

    This will isolate the Grid power when it fails (or being worked on by
    maintenance men), and _automatically_ switch over to your "electric power plant"
    (if that is what you meant).

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