I look to California and Texas for a glimpse of our energy future.
A quote from a solar forum I follow
Got 20kw diesel with 300 gallons of fuel (purchased at $2.19/gal) (worth millions now.) We started out with a small 5k inverter that we ran off of our 48V forklift (2 birds with 1 stone). That ran fridge and lights fine for a few hrs, but not a good long term multi day solution. Inverter would not run a water pump, so no water. Upgraded to 2 SI 6048 and a new fork lift battery (double duty again - use in fork when the old 17year old battery gives it up plus an extra now).
That is fine for a few weeks w/o power, but also not great for long term (running A/C 24/7).
The good thing about the SI/SB option is that you will hardly ever need the generator. SB can power house during the day light hours and SI takes power from the battery to power smaller loads at night. So you really only need enough batteries to make it through the night....
Here in Ca, solar can run all the big loads during the day, then at night you only need enugh for fridge, lights, etc. Run dryer, water pumps, etc. all during the day when the solar is available. It is sort of a big change from when peak/off peak rates meant it was best to run big loads at night. Now peak/off peak is also mostly the same and makes no sense to run anything at night anymore.
Note SI/SB refers to a model and brand of electronics (SMA) connecting the array, the grid, the generator, and the batteries to all the appliances. (Sunny Island/Sunny boy)