If charging with just the quick chargers, there's no need to carry a generator. I just posted in another thread that both can run off a single 20A outlet, and there is probably not a road in America you can ride and not find a 20A outlet somewhere to use within the range of the 2014 Zero S models. Both quiq chargers will pull between 1500w and 1920 watts depending on the SOC of the bike since they are constant current chargers. Instead of carrying 40 pounds of generator, why not 40 pounds more Quiq chargers? Or get dual 2500 watt Elcons from Harlan at Hollywood Electrics and charge with 5000+ watts! Charge most of the way in about an hour or so from any RV park in the country! Every 25 miles along almost every major highway in the country as far as I've seen, and I've travelled almost every highway in the country on my Zero. Get a J1772 and you can also use the 10,000+ public chargers at shopping centers, public parks and other places. Just my preference perhaps.
The generator will take many many hours to charge and doesn't sound fun at all. Actually makes my ears hurt thinking about how much noise it's going to make and how slow it will charge. Small generators are obnoxiously loud for the amount of work they do. Sort of like a Chihuahua. Would it not be better to charge faster while you might be eating at a restaurant or food stop and leave fully charged or almost full with no inconvenience or waiting?
I'm assuming all of you already have the power tank option installed? Next on my list would be J1772 and elcons from Harlan at Hollywood electrics. As Ben Rich. He ordered that kit last year from Harlan and now travels all over the place on his stock looking 2012 Zero ZF9 and charges up everywhere in under 90 minutes!