PC Controllers with the plastic enclosures have a limit of 8 amps/channel and 15 amps/power feed cord (one feed does channels 1-8, the other 9-16)
Consider also that and individual home circuit can only handle 15-20 amps, with a 75% or 80% max usage being ideal as stated above. Depending on your usage you may be able to put both controller feeds on the same circuit. If you use a lot of amps, you may have to separate the feeds to different circuits. I highly suggest the Kil-A-Watt meter as well.