Well, I'm not up to 20 amps yet. Not much load on this ciruit anyhow. Just my computer, scanner, Yaesu Power supply surround sound and a couple other things. Ive never tried to transmit a full 100 watts on the HF rig and 50 watts on the VHF/UHF rig with the music full blast while scanning and printing a document. lol That would be interesting to see.