They're thin, flexible Solar Panels and are extremely light.
I have a solar panel and charger strong enough to recharge my many rechargeable batteries in a reasonable length of time and it’s strong enough to recharge my Kindle and cell phone (which won’t work if power is out). With power outages after a hurricane, I have two older phones that plug directly in the phone jack in the wall and they work. My power needs are met. Losing power won’t affect me very much except for air conditioning but I will have working fans.
If you are suggesting hospitals could have these light weight panels, they won’t have them.