How hard is for a multi million company like Apple to make a solar battery charging device for your iPhone / MacBook ?

Probably not hard, but they’re not in the business of making niche peripherals. Market realities let others like Ravi be innovative.

It’s probably more a question of how much you’re willing to pay for it, how many agree with you and is that a doable/profitable solution.

…or a toothbrush powered by fusion.

This article focuses on the future of electric car batteries but the same can be said for iPhone/Macbook batteries too. The battery technology isn’t moving as quickly as other technologies.
http://www.newsweek.com/id/170341

I’m not sure why they would since it’s been done by others. They can focus on their core competencies this way (and let’s face it, anything to do with batteries is NOT an Apple core competency) while others focus on things like that.

Harder than you might think. Apple has a history of refusing to release that isn’t PERFECT (or at least, not Apple-perfect). When faced with the choice between “let the user do something, but in an imperfect way” and “don’t let the user do something at all”, Apple tends strongly towards “don’t let the user do something at all”.

Solar panels aren’t perfect technology. They’re not pretty, they don’t generate much power for the sunlight put into them, and they’re easily broken. For Apple, this is unacceptable.

In addition, I believe the MagSafe port on MacBooks and Pros is designed to take a steady 14 volts (correct me if I’m wrong). Solar panels, to the best of my knowledge, don’t generate this kind of voltage without stepping up. Reliable voltage is hard to get off a solar panel. This doesn’t mean it would be impossible to integrate a solar panel into the MacBook (Pro) power system, but it would require an overhaul if it were to be done properly, and Apple won’t do it if it’s not done properly. That’s a lot of engineering time to spend on a peripheral that not many users might buy or use.

Just to give an idea of the engineering challenges involved.