I'm the only guy in my neighborhood that does not have one. What I have is a solar powered battery backup system. The battery pack stores 40.8 KW for my use. The way it's setup is the house uses 50% of that every day. That keeps my PG&E bill down to less than $120 a year. The other 50% is used if the grid shuts down.
In December, the sun can only recharge the batteries to 63-65%. But that includes running the five dedicated circuits in the house. That's all the wall plugs, except those around the kitchen counter, and the garage. That also include all of the lights in the house, the ceiling fans, the refrigerator, and my forced air heating system.
It doesn't run the AC, but it will run the fan.
I'm told it will take 11 years to pay for itself. I paid $25,000 for the whole setup. E
