I am trying to help out a friend who is wiring up an RV.
The problem I have is that there is a requirement to connect 220 volts AC via the shore supply to the RV whilst maintaining the ability to use the Genny.
The way I see it is that he needs to have a selector switch which will allow the shore supply to feed 1) the transformer to provide 110 volts and 2) power up the installed 220 volt ring main, it is also required to isolate the genny from this 220 volts so as not to cause any PCB damage. On the other side the genny supplies 110 volts to 1) the installed 110 volt ring main and feeds into the transformer to provide 220 volts to the 220 volt ring main, but it is also neccessary to prevent volts appearing on the pins on the 220 volt inlet plug, which is why I think a change over selector switch is required.
My question is, have I got this right? Can you feed power both ways across the transformer or do you need a dual primary transformer (and if so where to get this from) and the only selector switch I can find is a 32 Amp, 4 pole change over switch that costs around £60?
The option to fit a site type transformer cannot be considered.
I would be very grateful for any advice on this subject as I am wasting a lot of time phoning around and googling for answers......
TIA
Keith
The problem I have is that there is a requirement to connect 220 volts AC via the shore supply to the RV whilst maintaining the ability to use the Genny.
The way I see it is that he needs to have a selector switch which will allow the shore supply to feed 1) the transformer to provide 110 volts and 2) power up the installed 220 volt ring main, it is also required to isolate the genny from this 220 volts so as not to cause any PCB damage. On the other side the genny supplies 110 volts to 1) the installed 110 volt ring main and feeds into the transformer to provide 220 volts to the 220 volt ring main, but it is also neccessary to prevent volts appearing on the pins on the 220 volt inlet plug, which is why I think a change over selector switch is required.
My question is, have I got this right? Can you feed power both ways across the transformer or do you need a dual primary transformer (and if so where to get this from) and the only selector switch I can find is a 32 Amp, 4 pole change over switch that costs around £60?
The option to fit a site type transformer cannot be considered.
I would be very grateful for any advice on this subject as I am wasting a lot of time phoning around and googling for answers......
TIA
Keith