To body clip a horse you need clippers with a much stronger motor than those. Also, any clippers with adjustable blades like that aren't going to work and are usually meant for simple clipping like whiskers, bridal paths etc. You'd need stronger clippers and several blades to get through a whole body clip. Most clippers suitable for body clipping will probably run you well over $100, and that's at the low end. You can probably find used or refurbished ones for a decent price though. Good luck!
I just use regular human clippers and have done my gelding twice now. It doesn't turn out show-perfect (probably more because of me than the clippers), but it gets the job done. I just keep it clean and oiled and it's never over-heated and shut off or anything.