Can the grid and inverter share a neutral?

I upgraded the solar on my trailer, but was wondering if it safe for the neutral to be shared with the grid and inverter for the solar. I was hoping to run 1 circuit on solar and the rest on grid, but don't know if I have to isolate the neutral or if I can leave them all tied together. I have the bougerv 2000w pure sine inverter. Only the hots are switched as of now, and I keep those separate as I don't want to backfeed the grid or have any out of phase potential.