A childhood friend of mine who lives on the West Coast is building a "cabin" somewhere out in the middle of nowhere. He asked me about sizing a generator so that he could have enough power to support a private-party size/volume rock band. Does anyone have any suggestions other than creating a hypothetical line up (two guitars, keyboards, bass, PA, monitors and lights), assigning current draws to each, adding them up and then doubling it (or some reasonable safety factor)? Since this will be a permanently installed generator and I have the feeling that my friend has plenty o' green, should I suggest anything additional equipment/features...regulators, filters, etc. to make the cleanest power that is reasonably possible? Thanks!