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Inverter with double input: 220 volt and pv panels

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Posted by Sandro kensan on April 15, 2013, 2:39 pm
 
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.
--  
Sandro kensan www.kensan.it & www.qiqi.it geek site

Posted by argusy on April 16, 2013, 5:20 am
 
On 16/04/2013 12:09 AM, Sandro kensan wrote:



 >From your URL you're probably in Italy.


 > 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 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
 >
 > 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.

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)
 >
 > If the outside grid is in maintenance and is insulate from the electric power
 > plant,

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.
 > Otherwise the maintenance men could be killed.

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).

argusy

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