I want to make offline UPS by connecting a changeover. Can I connect only the phase with the changeover keeping neutral connected each other?
If yes. Which wire of inverter output should be connected with the power line's neutral?
Yes you can select any wire from output socket as a common neutral.
But remember during backup mode(inverter),you can not touch battery terminals,if your inverter is smps.
Because in smps(high frequency transformer,chopper) inverters,negative of 12v dc and negative of 260v dc is almost common(connected with each other).
---------- Post added at 10:48 ---------- Previous post was at 10:30 ----------
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'* Naziv : OSCILATOR.BAS *
'* Autor : Milanovic V. *
'* Napomena : Primer softverskog oscilovanja *
'* Datum : 16.01.2006 *
'* Verzija : 1.0 *
'****************************************************************
Pocetak:
Low PortB.5 ' Pin B.5 postavi na 0
High PortB.4 ' Pin B.4 postavi na 1
pause 10
Low PortB.4 ' Pin B.4 postavi na 0
High PortB.5 ' Pin B.5 postavi na 1
pause 10
Goto Pocetak
End ' Kraj program
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Hi,tpetar.
Above paragraphs are complete source code for inverter with pic16F677.