What is the total amperage output and is it through one plug in or multiple plug ins.

30-amp 120-volt service = 3,600 watts 50-amp 120/240-volt service = 12,000 watts

I have the xg8000e, but I believe the xg15,000 has a pair of L14-30 (30-amp 240volt) sockets. A few feet from your meter, your electrician will install one manual transfer switch that's rated for the total amperage of your meter's service wire (probably 200 amps).. has nothing to do with your generator's specs. Next to the transfer switch, you electrician SHOULD install a single breaker switch between the meter-head and the transfer switch as a back-up to your transfer switch... again, rated for whatever your total amps service to your house is (probably 200amps). THEN, next to these ^^^ your electrician will install a pair (two) counter-sunk L14-30 male plug-style sockets each in their own box with a protective cover. These are what your TWO 30-amp extension chords will plug into providing your house with 60 amps 240 volts backup service. The nice thing about this ^^^^ setup I've described, is that if your generator is away (stolen, broken or loaned to your brother in law) and you need emergent power, any small generator has the single L14-30 30 amp plug so you will just use 1 extension chord and only have 30 amps 240 volts in your house. Smart Huh? My electrician charged me $1150 for the parts and labor,... yours will be slightly more for the extra counter-sunk L14-30 MALE socket box w/cover and it's wiring.

This generator has one 50 Amp, 120/240 Volt plug receptacle, single-phase, 60 Hz power supply. With this I can run my entire 3 bedroom house, garage and 3 ton AC/heat pump unit. Don't know where you are getting the 70-80 amp requirement from. Don't think I need a house that would require that much amperage.