The controller in the Bradley may have handled the extra load, BUT would would have been right on the top edge of limit. I changed 18 gauge hi temp wire with 12 gauge hi temp wire in cabinet along with new fuse in PID. I am a retired cellular cell site tech with a lot of experience with wiring. And before that was a broadcast engineer for 16 years. I will figure the current draw on your 800 watts if you need.