I was thinkinking last night about the feasibility of creating a "solar" charging station for my phone / laptops.

I suppose that i could always buy an inverter to plug my power packs into, but from what i understand (and i am a complete newbie) that is very inefficient.
So I was thinking that seeing as my laptop is 19.5v 4.62a and my phone is charged off USB (5v i think) then could i set up a 24V solar system and then convert the 24V to the respective voltages more efficiently?

I guess that if it is possible, how would i do it. - that is connvert the 24 to 19.5v

Any help / advice / links would be appreciated.