Grid Tie Inverter 120v into 240v grid?

10 Posts
Jan 12, 2011 01:56 pm
Grid Tie Inverter 120v into 240v grid?

I'm confused how 120 volt grid tie inverters work with the household 240 volt grid. I know how the grid works with (2) 120 volt legs out of phaze, leg 1 to neutral gets 120 volts, leg 2 to neutral gets 120 volts, accross the 2 legs gets your 240 volt. So if you have (1) 120 volt grid tie inverter plugged into one leg will that work? Seems like it would only feed to loads on that leg. And can you feed just one leg back to the grid? Or do you have to have (2) 120 volt grid tie inverters, one to feed each leg of the grid?
Right now I have an outback setup, one VFX3648, I charge batteries and feed a few dedicated loads. My thought was to change to a battery backed up grid tie system with one GTFX3048, but is that possible? Or would I need to get two inverters? Any help would be appreciated. Thank you.
 

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