a couple of good deep cycle batteries, with a tender you plug in every night can take care of lighting and maybe music needs….. also, swap to a 12v water pump, tankless propane heater(fires off of D cell batteries) cough up the extra for a propane fridge, all cooking done on propane, except maybe for sandwich press, coffee maker, and small toaster if needed…..
 
tie your battery bank into the 12v side of a small genset, but you will still need at least 3k unit if you have AC…. but you can put large vents in the roof to vent a lot of the heat, at least it wont build up and become oppressive, your hood fans can be 12v as well…..
a pair of 27 series deep cycles can run a lot of stuff for quiet some time….. or go big and put in an 8D, or a pair of them, and you will run all night long and half the next day before you have to recharge them