63 amps is just the breaker size they recommend. The output is 10000 watts, that is 5000 watts per hot leg, l1 5000, l2 5000, that equals 10000, or approx 42 amps at 240 volts. So they are taking 42 amps times 150% that equals 63 amps.
Nope no cables yet, ordered them last monday night, prime shipping to be here on Friday, after purchase it switched to around May 1st for delivery. They never shipped them till this monday. I should have them in the next few days.