Originally Posted by Joey waid
Is the gfi rated for 15 or 20 amps. You are pushing the limits with a 15 amp gfi. Also gfi's are really not rated for use with a transformer of that size. A transformer has a lot of inrush current to fill all the windings. A gfi measures out going and in coming current if there not close it will trip. I would look for standing water, in conduit or nicks in the out going power from the gfi. The fuses at the transformer should take care of everything behind it. Gfi's are notorious for flacking out, And its being used for something it was never designed for. Gfi's are usually put in side and branched out. A transformer needs a dedicated circuit supplying it.
20 amp. I am not using the full 1200 watts, only about 600 which shouldn't be a big deal. I have used this configuration for years without issue. There is no standing water and no nicks in the cable "that I know of"