When you say a lot of power outages what do you mean, and for how long? That Generator is going to be a monster and suck up a lot of fuel. It mite be over kill unless you have power outages like every week and for more than 24 hours at a time. Even then you could just have a small generator to keep a couple lights on for some temporary back up IMO. Do you live out in the country where no one will notice a loud monster of a generator?
Also, the fellow is right about giving your grow space face lifts, it is almost unavoidable.
Adieu