I am an installer and used to work with Goodwe inverters. Listen to me now when i tell you; STAY CLEAR! No joke! I wouldn't touch Goodwe with a 10 foot pole. I Personally installed over 20 pieces of 3P on-grid inverters and 5 of them are still working after 3 years. Of those i have already replaced, i am replacing 3 again. If for some reason your only option is Goodwe, buy a diesel generator.