The solar gorilla although quiet expensive does seem to cover my requirements.
Powergorilla solar panel.
It provides 5v and a 20v variable output.
To charge the powergorilla battery via this tough solar panel simply connect the solargorilla to the powergorilla using the dc connection cable and the l53d tip.
Solargorilla is also a viable charging option for netbooks under 40 watts and it can even charge your mobile phone ipod handheld games consoles and many more devices from the 5v.
Now paired with the powergorilla tactical battery backup charger giving the user an unlimited and sustainable power supply.
The technically advanced solar panels ensure superb power and reliable performance all housed in a tough outer casing.
The tactical solargorilla portable solar charger gives your powergorilla battery juice anywhere under the sun.
Charge any device on the go in extreme conditions in the outdoors.
Featuring a rugged and water resistant solar panel that can efficiently convert sunlight into solar energy and supply it to an array of devices.
It is primarily designed to be used in conjunction with the powergorilla via the l53d tip and some laptops under 40 watts.
Portable fold up design protects your solar panels when stored.
Most of the portable size solar panels only have one output voltage.
Free shipping returns.
Free shipping returns on all power packs solar panels to charge your phone tablet or laptop.
It is also a viable charging option for netbooks under 40 watts and it can even charge virtually any 5v device from the usb output.
The powergorilla will give you an extra 2 5 hours of power depending on your laptop s specification and over 20 hours on various other electronic devices.
The award winning portable batteries solar panels are built to last.
It may not work with some laptops over 40 watts directly.