I have an old laptop that I am going to try to power purely from solar power I was curious if anyone here could turn me on to the formula's and math. I will need to figure its power demands. I have the original charging brick that I could cannibalize,. However I also have a universal charger made to work off a cars cigarette lighter an I have found a way to plug that directly into a small solar charge controller. Totally a learning project the long term goal is to power it 24/7 from solar. In short a miniature system that I will hopefully be able to scale into bigger stuff in the future.