my solution: 4x 7.5V 450 mA pamels from ebay, giving me 15V 0.9A in full sun, panels are charging a 12V 5Ah Pb-gel battery. it's standing around in the backyard (battery and electronics are in a waterproof plastic box). it needs around 2 days (not talking about cloudless sky, after it's ireland
to fully charge, that gives me enough power to charge my phone, the reader and some batterys for the light
when i charge over the day even less power is drained from the battery, so i can also charge battery for my camera and or another mobile. total costs of the fun: panels ~ $30, battery $20 in a local shop (i took one meant for quads), charger electronics $10, another 5 bucks for 2 car ligher sockets and a 12V -> 5V car charger with usb style connector.