I take it you dont need ac in summer at your place. Man, i wish my house only took less than 500 watts per peak hour in summer.... never would happen here. How many batteries can a 7 kw system charge to generate power in the evenings?
I just got done doing work on a ladies generator on an off grid system. Man i wish i never got involved in it. She refuses to allow power from battery and inverters to travel back to generator to keep system charged as she says she runs out of lights in the evening if she does. Shes sunk over $40,000 into this system over the years and still has power issues . I tried a solar charger on generator battery, but still having issues of dead battery. I told her either let me feed generator charger or find someone else that may have a solution. I try to stay away from any off grid house as it has bern a pain in my butt for too many years. I guess one that is used on a house that is still powered by utilities wouldnt be as much of a pain.
I also had a call from someone that has a Solar system thats tied into his panel thru smoke and mirrors. But when he loses utility the battery system does not power the house. The installer told him on utility fed systems the batterys cannot power house if utility is off. I didnt want to get involved....beyond my pay grade. On a generator repair website i belong to there have bern several posts about this same issues. As far as i know there is no legal way around it as its a public utility issue. Oh well, thats for smarter brains than me. Besides, now im retired so i could care less