I tried using the FEL to push in T posts, but it was hit or miss on going in straight, or not. I also bent a few of them. What I hated the worse was having to have a helper, and the constant back and forth to get just one T post in the ground.
I just finished fencing in a 27 acre pasture with T posts every ten feet, and wood posts every 100 feet or less. For me, the Mansaver T post pounder was a game changer. I power it from my Honda generator, so that's easy. Honda always starts real easy. Then I use a pancake air compressor to provide air pressure for the Mansaver to do its thing. Even in the hardest soil, in the middle of August, it always gets them in the ground. It might take half an hour, but it never gets tired!!!
The 98-E T-Post Driver: your one-person, lightweight solution. Perfect for tight spots, it runs off any small compressor and drives T-posts fast without bending.
www.rohrermfg.com