I have one of the first Juice Boxes ever produced. It's rated for 60 amps at 240 volts but they never got the bugs out of the wifi on the prototype run. It's theoretically capable of 14.4 Kw so I installed wiring and breakers heavy enough to support that. My Leaf draws just 7 Kw on a good day so I'm a bit into the overkill zone. When we've finished cracking the CAN bus codes on the Tesla 10 Kw chargers I'd be able to use one.