What happens when the poser goes out?
Power = poser.
Typing in crappy light again, and fat fingers.
Backup generators and/or battery banks or both. Homes today are sometimes fitted with a battery bank that will charge during cheaper electric times and power the house during the more expensive energy usage times.
Tesla has an all in one unit. For those who really want to save on their electric bill after the solar panels are paid for; there’s the solar panel route. Particularly good for those who live in sunny areas.
One day a scientific breakthrough will make solar power affordable to all. Homes will use solar roofing to power their houses.
Living off grid has become a really big thing and a big business for those who sell products to make it happen.