google it theres already small solar chargers on the market.. and there not to expensive... i nearly bought one last year before i went backpacking but i didnt see the need for it as there's power points everywhere.. and with over 8 hours battery life on my laptop i didnt need to worry bout charging it that often..... and my phone could charge off of it in 2 hours..... so i was sorted just charging it once a day.. when i was at the hostels or campsites